UBUNTU-CVE-2026-29035

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Source

https://ubuntu.com/security/CVE-2026-29035

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29035.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-29035

Upstream

CVE-2026-29035

Withdrawn

2026-09-07T01:37:06Z

Published

2026-08-11T21:17:00Z

Modified

2026-09-07T03:45:02Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

CivetWeb (commit 4a4f0c95) contains a heap and stack buffer overflow vulnerability in the read_websocket() function that allows unauthenticated remote attackers to corrupt memory by sending compressed WebSocket frames when both USE_ZLIB and MG_EXPERIMENTAL_INTERFACES are defined. Attackers can negotiate permessage-deflate during the WebSocket handshake and send a crafted frame with the RSV1 bit set, causing the server to write a 4-byte zlib sync trailer out-of-bounds past the allocated buffer, leading to heap metadata corruption, denial of service, or potential code execution.

References

Affected packages

Ubuntu:22.04:LTS / civetweb

Package

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

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

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "civetweb",
            "binary_version": "1.15+dfsg-3"
        },
        {
            "binary_name": "libcivetweb1",
            "binary_version": "1.15+dfsg-3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29035.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

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "civetweb",
            "binary_version": "1.16+dfsg-1build1"
        },
        {
            "binary_name": "libcivetweb1",
            "binary_version": "1.16+dfsg-1build1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29035.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

Ecosystem specific

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

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29035.json"