UBUNTU-CVE-2026-124040

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Source
https://ubuntu.com/security/CVE-2026-124040
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-124040.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-124040
Upstream
Published
2026-11-09T00:00:00Z
Modified
2026-11-10T02:50:22Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 9.2 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

CivetWeb through 1.16, when built with USE_HTTP2 and enable_http2 on, contains a use-after-free vulnerability in handle_http2() that retains freed :method and :path pointers. Unauthenticated remote attackers can send a later HEADERS frame omitting these pseudo-headers to influence request method or path seen by access rules, or crash the server.

References

Affected packages

Ubuntu:Pro:22.04:LTS / civetweb

Package

Name
civetweb
Purl
pkg:deb/ubuntu/civetweb?arch=source&distro=esm-apps%2Fjammy

Affected ranges

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

Affected versions

1.*
1.13+dfsg-5
1.15+dfsg-1
1.15+dfsg-3
1.15+dfsg-3ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "civetweb",
            "binary_version": "1.15+dfsg-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "libcivetweb1",
            "binary_version": "1.15+dfsg-3ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-124040.json"

Ubuntu:24.04:LTS / civetweb

Package

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

Affected ranges

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

Affected versions

1.*
1.16+dfsg-1
1.16+dfsg-1build1
1.16+dfsg-1ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "civetweb",
            "binary_version": "1.16+dfsg-1ubuntu0.1"
        },
        {
            "binary_name": "libcivetweb1",
            "binary_version": "1.16+dfsg-1ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-124040.json"

Ubuntu:26.10 / civetweb

Package

Name
civetweb
Purl
pkg:deb/ubuntu/civetweb?arch=source&distro=stonking

Affected ranges

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

Affected versions

1.*
1.16+dfsg-3
1.16+dfsg-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "civetweb",
            "binary_version": "1.16+dfsg-4"
        },
        {
            "binary_name": "libcivetweb1",
            "binary_version": "1.16+dfsg-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-124040.json"

Ubuntu:26.04:LTS / civetweb

Package

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

Affected ranges

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

Affected versions

1.*
1.16+dfsg-2
1.16+dfsg-3
1.16+dfsg-3ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "civetweb",
            "binary_version": "1.16+dfsg-3ubuntu0.1"
        },
        {
            "binary_name": "libcivetweb1",
            "binary_version": "1.16+dfsg-3ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-124040.json"