UBUNTU-CVE-2026-11856

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Source
https://ubuntu.com/security/CVE-2026-11856
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11856.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-11856
Upstream
Downstream
Related
Published
2026-06-24T14:00:00Z
Modified
2026-08-20T05:15:04Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Successfully using libcurl to do a transfer to a specific HTTP origin (hostA) with Digest authentication and then changing the origin to a different one (hostB) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Authorization: header field meant for hostA, to hostB.

References

Affected packages

Ubuntu:22.04:LTS
curl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
7.81.0-1ubuntu1.26

Affected versions

7.*
7.74.0-1.3ubuntu2
7.74.0-1.3ubuntu3
7.80.0-3
7.81.0-1
7.81.0-1ubuntu1.1
7.81.0-1ubuntu1.2
7.81.0-1ubuntu1.3
7.81.0-1ubuntu1.4
7.81.0-1ubuntu1.6
7.81.0-1ubuntu1.7
7.81.0-1ubuntu1.8
7.81.0-1ubuntu1.10
7.81.0-1ubuntu1.11
7.81.0-1ubuntu1.13
7.81.0-1ubuntu1.14
7.81.0-1ubuntu1.15
7.81.0-1ubuntu1.16
7.81.0-1ubuntu1.17
7.81.0-1ubuntu1.18
7.81.0-1ubuntu1.19
7.81.0-1ubuntu1.20
7.81.0-1ubuntu1.21
7.81.0-1ubuntu1.22
7.81.0-1ubuntu1.23
7.81.0-1ubuntu1.24
7.81.0-1ubuntu1.25

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "7.81.0-1ubuntu1.26"
        },
        {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.81.0-1ubuntu1.26"
        },
        {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.81.0-1ubuntu1.26"
        },
        {
            "binary_name": "libcurl4",
            "binary_version": "7.81.0-1ubuntu1.26"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11856.json"
Ubuntu:24.04:LTS
curl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
8.5.0-2ubuntu10.12

Affected versions

8.*
8.2.1-1ubuntu3
8.2.1-1ubuntu3.1
8.4.0-2ubuntu1
8.5.0-2ubuntu1
8.5.0-2ubuntu2
8.5.0-2ubuntu8
8.5.0-2ubuntu9
8.5.0-2ubuntu10
8.5.0-2ubuntu10.1
8.5.0-2ubuntu10.2
8.5.0-2ubuntu10.3
8.5.0-2ubuntu10.4
8.5.0-2ubuntu10.5
8.5.0-2ubuntu10.6
8.5.0-2ubuntu10.7
8.5.0-2ubuntu10.8
8.5.0-2ubuntu10.9
8.5.0-2ubuntu10.10
8.5.0-2ubuntu10.11

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "8.5.0-2ubuntu10.12"
        },
        {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.5.0-2ubuntu10.12"
        },
        {
            "binary_name": "libcurl4t64",
            "binary_version": "8.5.0-2ubuntu10.12"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11856.json"
Ubuntu:25.10
curl

Package

Name
curl
Purl
pkg:deb/ubuntu/curl?arch=source&distro=questing

Affected ranges

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

Affected versions

8.*
8.12.1-3ubuntu1
8.13.0-5ubuntu1
8.14.1-1ubuntu2
8.14.1-1ubuntu3
8.14.1-2ubuntu1
8.14.1-2ubuntu1.1
8.14.1-2ubuntu1.2
8.14.1-2ubuntu1.3
8.14.1-2ubuntu1.4
8.14.1-2ubuntu1.5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "8.14.1-2ubuntu1.5"
        },
        {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.14.1-2ubuntu1.5"
        },
        {
            "binary_name": "libcurl4t64",
            "binary_version": "8.14.1-2ubuntu1.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11856.json"
Ubuntu:26.04:LTS
curl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
8.18.0-1ubuntu2.4

Affected versions

8.*
8.14.1-2ubuntu1
8.17.0-1ubuntu1
8.18.0-1ubuntu1
8.18.0-1ubuntu2
8.18.0-1ubuntu2.1
8.18.0-1ubuntu2.2
8.18.0-1ubuntu2.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "8.18.0-1ubuntu2.4"
        },
        {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.18.0-1ubuntu2.4"
        },
        {
            "binary_name": "libcurl4t64",
            "binary_version": "8.18.0-1ubuntu2.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11856.json"
Ubuntu:Pro:14.04:LTS
curl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
7.35.0-1ubuntu2.20+esm22

Affected versions

7.*
7.32.0-1ubuntu1
7.33.0-1ubuntu1
7.34.0-1ubuntu1
7.35.0-1ubuntu1
7.35.0-1ubuntu2
7.35.0-1ubuntu2.1
7.35.0-1ubuntu2.2
7.35.0-1ubuntu2.3
7.35.0-1ubuntu2.5
7.35.0-1ubuntu2.6
7.35.0-1ubuntu2.7
7.35.0-1ubuntu2.8
7.35.0-1ubuntu2.9
7.35.0-1ubuntu2.10
7.35.0-1ubuntu2.11
7.35.0-1ubuntu2.12
7.35.0-1ubuntu2.13
7.35.0-1ubuntu2.14
7.35.0-1ubuntu2.15
7.35.0-1ubuntu2.16
7.35.0-1ubuntu2.17
7.35.0-1ubuntu2.19
7.35.0-1ubuntu2.20
7.35.0-1ubuntu2.20+esm2
7.35.0-1ubuntu2.20+esm3
7.35.0-1ubuntu2.20+esm4
7.35.0-1ubuntu2.20+esm5
7.35.0-1ubuntu2.20+esm6
7.35.0-1ubuntu2.20+esm7
7.35.0-1ubuntu2.20+esm8
7.35.0-1ubuntu2.20+esm9
7.35.0-1ubuntu2.20+esm10
7.35.0-1ubuntu2.20+esm11
7.35.0-1ubuntu2.20+esm12
7.35.0-1ubuntu2.20+esm13
7.35.0-1ubuntu2.20+esm14
7.35.0-1ubuntu2.20+esm15
7.35.0-1ubuntu2.20+esm16
7.35.0-1ubuntu2.20+esm17
7.35.0-1ubuntu2.20+esm18
7.35.0-1ubuntu2.20+esm19
7.35.0-1ubuntu2.20+esm20
7.35.0-1ubuntu2.20+esm21

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "7.35.0-1ubuntu2.20+esm22"
        },
        {
            "binary_name": "libcurl3",
            "binary_version": "7.35.0-1ubuntu2.20+esm22"
        },
        {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.35.0-1ubuntu2.20+esm22"
        },
        {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.35.0-1ubuntu2.20+esm22"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11856.json"
Ubuntu:Pro:16.04:LTS
curl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
7.47.0-1ubuntu2.19+esm18

Affected versions

7.*
7.43.0-1ubuntu2
7.45.0-1ubuntu1
7.46.0-1ubuntu1
7.47.0-1ubuntu1
7.47.0-1ubuntu2
7.47.0-1ubuntu2.1
7.47.0-1ubuntu2.2
7.47.0-1ubuntu2.3
7.47.0-1ubuntu2.4
7.47.0-1ubuntu2.5
7.47.0-1ubuntu2.6
7.47.0-1ubuntu2.7
7.47.0-1ubuntu2.8
7.47.0-1ubuntu2.9
7.47.0-1ubuntu2.11
7.47.0-1ubuntu2.12
7.47.0-1ubuntu2.13
7.47.0-1ubuntu2.14
7.47.0-1ubuntu2.15
7.47.0-1ubuntu2.16
7.47.0-1ubuntu2.18
7.47.0-1ubuntu2.19
7.47.0-1ubuntu2.19+esm1
7.47.0-1ubuntu2.19+esm2
7.47.0-1ubuntu2.19+esm3
7.47.0-1ubuntu2.19+esm4
7.47.0-1ubuntu2.19+esm5
7.47.0-1ubuntu2.19+esm6
7.47.0-1ubuntu2.19+esm7
7.47.0-1ubuntu2.19+esm8
7.47.0-1ubuntu2.19+esm9
7.47.0-1ubuntu2.19+esm10
7.47.0-1ubuntu2.19+esm11
7.47.0-1ubuntu2.19+esm12
7.47.0-1ubuntu2.19+esm13
7.47.0-1ubuntu2.19+esm15
7.47.0-1ubuntu2.19+esm16
7.47.0-1ubuntu2.19+esm17

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "7.47.0-1ubuntu2.19+esm18"
        },
        {
            "binary_name": "libcurl3",
            "binary_version": "7.47.0-1ubuntu2.19+esm18"
        },
        {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.47.0-1ubuntu2.19+esm18"
        },
        {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.47.0-1ubuntu2.19+esm18"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11856.json"
Ubuntu:Pro:18.04:LTS
curl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
7.58.0-2ubuntu3.24+esm11

Affected versions

7.*
7.55.1-1ubuntu2
7.55.1-1ubuntu2.1
7.57.0-1ubuntu1
7.58.0-2ubuntu1
7.58.0-2ubuntu2
7.58.0-2ubuntu3
7.58.0-2ubuntu3.1
7.58.0-2ubuntu3.2
7.58.0-2ubuntu3.3
7.58.0-2ubuntu3.5
7.58.0-2ubuntu3.6
7.58.0-2ubuntu3.7
7.58.0-2ubuntu3.8
7.58.0-2ubuntu3.9
7.58.0-2ubuntu3.10
7.58.0-2ubuntu3.12
7.58.0-2ubuntu3.13
7.58.0-2ubuntu3.14
7.58.0-2ubuntu3.15
7.58.0-2ubuntu3.16
7.58.0-2ubuntu3.17
7.58.0-2ubuntu3.18
7.58.0-2ubuntu3.19
7.58.0-2ubuntu3.20
7.58.0-2ubuntu3.21
7.58.0-2ubuntu3.22
7.58.0-2ubuntu3.23
7.58.0-2ubuntu3.24
7.58.0-2ubuntu3.24+esm1
7.58.0-2ubuntu3.24+esm2
7.58.0-2ubuntu3.24+esm3
7.58.0-2ubuntu3.24+esm4
7.58.0-2ubuntu3.24+esm5
7.58.0-2ubuntu3.24+esm7
7.58.0-2ubuntu3.24+esm8
7.58.0-2ubuntu3.24+esm9
7.58.0-2ubuntu3.24+esm10

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "7.58.0-2ubuntu3.24+esm11"
        },
        {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.58.0-2ubuntu3.24+esm11"
        },
        {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.58.0-2ubuntu3.24+esm11"
        },
        {
            "binary_name": "libcurl4",
            "binary_version": "7.58.0-2ubuntu3.24+esm11"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11856.json"
Ubuntu:Pro:20.04:LTS
curl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
7.68.0-1ubuntu2.25+esm6

Affected versions

7.*
7.65.3-1ubuntu3
7.65.3-1ubuntu4
7.66.0-1ubuntu1
7.67.0-2ubuntu1
7.68.0-1ubuntu1
7.68.0-1ubuntu2
7.68.0-1ubuntu2.1
7.68.0-1ubuntu2.2
7.68.0-1ubuntu2.4
7.68.0-1ubuntu2.5
7.68.0-1ubuntu2.6
7.68.0-1ubuntu2.7
7.68.0-1ubuntu2.10
7.68.0-1ubuntu2.11
7.68.0-1ubuntu2.12
7.68.0-1ubuntu2.13
7.68.0-1ubuntu2.14
7.68.0-1ubuntu2.15
7.68.0-1ubuntu2.16
7.68.0-1ubuntu2.18
7.68.0-1ubuntu2.19
7.68.0-1ubuntu2.20
7.68.0-1ubuntu2.21
7.68.0-1ubuntu2.22
7.68.0-1ubuntu2.23
7.68.0-1ubuntu2.24
7.68.0-1ubuntu2.25
7.68.0-1ubuntu2.25+esm2
7.68.0-1ubuntu2.25+esm3
7.68.0-1ubuntu2.25+esm4
7.68.0-1ubuntu2.25+esm5

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "7.68.0-1ubuntu2.25+esm6"
        },
        {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.68.0-1ubuntu2.25+esm6"
        },
        {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.68.0-1ubuntu2.25+esm6"
        },
        {
            "binary_name": "libcurl4",
            "binary_version": "7.68.0-1ubuntu2.25+esm6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11856.json"