UBUNTU-CVE-2026-18374

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Source
https://ubuntu.com/security/CVE-2026-18374
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18374.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-18374
Upstream
  • CVE-2026-18374
Published
2026-08-31T00:00:00Z
Modified
2026-08-31T22:15:07.028965083Z
Severity
  • 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Passing an effectively empty string to the ,ccs= syntax extension of the mode argument in the fopen function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled. This usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for ccs should not pass them through without validation.

References

Affected packages

Ubuntu:22.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.34-0ubuntu3
2.35-0ubuntu1
2.35-0ubuntu3
2.35-0ubuntu3.1
2.35-0ubuntu3.3
2.35-0ubuntu3.4
2.35-0ubuntu3.5
2.35-0ubuntu3.6
2.35-0ubuntu3.7
2.35-0ubuntu3.8
2.35-0ubuntu3.9
2.35-0ubuntu3.10
2.35-0ubuntu3.11
2.35-0ubuntu3.12
2.35-0ubuntu3.13
2.35-0ubuntu3.14

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "glibc-source"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc-devtools"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-dev-s390"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-prof"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-s390"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "locales"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "locales-all"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "nscd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18374.json"
Ubuntu:24.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.38-1ubuntu6
2.38-3ubuntu1
2.39-0ubuntu1
2.39-0ubuntu2
2.39-0ubuntu6
2.39-0ubuntu8
2.39-0ubuntu8.1
2.39-0ubuntu8.2
2.39-0ubuntu8.3
2.39-0ubuntu8.4
2.39-0ubuntu8.5
2.39-0ubuntu8.6
2.39-0ubuntu8.7
2.39-0ubuntu8.8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "glibc-source"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc-devtools"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-dev-s390"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-s390"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "locales"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "locales-all"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "nscd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18374.json"
Ubuntu:26.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.42-0ubuntu3
2.42-2ubuntu1
2.42-2ubuntu2
2.42-2ubuntu4
2.42-2ubuntu5
2.43-2ubuntu1
2.43-2ubuntu2
2.43-2ubuntu2.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "glibc-source"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc-devtools"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc-gconv-modules-extra"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "locales"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "locales-all"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "nscd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18374.json"
Ubuntu:Pro:14.04:LTS
eglibc

Package

Name
eglibc
Purl
pkg:deb/ubuntu/eglibc?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.17-93ubuntu4
2.18-0ubuntu1
2.18-0ubuntu2
2.18-0ubuntu4
2.18-0ubuntu5
2.18-0ubuntu6
2.18-0ubuntu7
2.19-0ubuntu2
2.19-0ubuntu3
2.19-0ubuntu4
2.19-0ubuntu5
2.19-0ubuntu6
2.19-0ubuntu6.1
2.19-0ubuntu6.3
2.19-0ubuntu6.4
2.19-0ubuntu6.5
2.19-0ubuntu6.6
2.19-0ubuntu6.7
2.19-0ubuntu6.8
2.19-0ubuntu6.9
2.19-0ubuntu6.10
2.19-0ubuntu6.11
2.19-0ubuntu6.13
2.19-0ubuntu6.14
2.19-0ubuntu6.15
2.19-0ubuntu6.15+esm1
2.19-0ubuntu6.15+esm2
2.19-0ubuntu6.15+esm3
2.19-0ubuntu6.15+esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "eglibc-source"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6-armel"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6-dev-armel"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6-pic"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6-prof"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "multiarch-support"
        },
        {
            "binary_version": "2.19-0ubuntu6.15+esm4",
            "binary_name": "nscd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18374.json"
Ubuntu:Pro:16.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.21-0ubuntu4
2.21-0ubuntu5
2.21-0ubuntu6
2.23-0ubuntu1
2.23-0ubuntu2
2.23-0ubuntu3
2.23-0ubuntu4
2.23-0ubuntu5
2.23-0ubuntu6
2.23-0ubuntu7
2.23-0ubuntu9
2.23-0ubuntu10
2.23-0ubuntu11
2.23-0ubuntu11.2
2.23-0ubuntu11.3
2.23-0ubuntu11.3+esm1
2.23-0ubuntu11.3+esm2
2.23-0ubuntu11.3+esm3
2.23-0ubuntu11.3+esm5
2.23-0ubuntu11.3+esm6
2.23-0ubuntu11.3+esm7
2.23-0ubuntu11.3+esm8
2.23-0ubuntu11.3+esm9

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "glibc-source"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-armel"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-dev-armel"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-dev-s390"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-pic"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-s390"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "locales"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "locales-all"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "multiarch-support"
        },
        {
            "binary_version": "2.23-0ubuntu11.3+esm9",
            "binary_name": "nscd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18374.json"
Ubuntu:Pro:18.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.26-0ubuntu2
2.26-0ubuntu2.1
2.27-0ubuntu2
2.27-0ubuntu3
2.27-3ubuntu1
2.27-3ubuntu1.2
2.27-3ubuntu1.3
2.27-3ubuntu1.4
2.27-3ubuntu1.5
2.27-3ubuntu1.6
2.27-3ubuntu1.6+esm1
2.27-3ubuntu1.6+esm2
2.27-3ubuntu1.6+esm3
2.27-3ubuntu1.6+esm4
2.27-3ubuntu1.6+esm5
2.27-3ubuntu1.6+esm6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "glibc-source"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-armel"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-dev-armel"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-dev-s390"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-lse"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-pic"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-s390"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "locales"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "locales-all"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "multiarch-support"
        },
        {
            "binary_version": "2.27-3ubuntu1.6+esm6",
            "binary_name": "nscd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18374.json"
Ubuntu:Pro:20.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.30-0ubuntu2
2.30-0ubuntu3
2.31-0ubuntu5
2.31-0ubuntu6
2.31-0ubuntu7
2.31-0ubuntu9
2.31-0ubuntu9.1
2.31-0ubuntu9.2
2.31-0ubuntu9.3
2.31-0ubuntu9.7
2.31-0ubuntu9.9
2.31-0ubuntu9.12
2.31-0ubuntu9.14
2.31-0ubuntu9.15
2.31-0ubuntu9.16
2.31-0ubuntu9.17
2.31-0ubuntu9.18
2.31-0ubuntu9.18+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "glibc-source"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-armel"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-dev-armel"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-dev-s390"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-lse"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-pic"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-prof"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-s390"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "locales"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "locales-all"
        },
        {
            "binary_version": "2.31-0ubuntu9.18+esm1",
            "binary_name": "nscd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18374.json"