UBUNTU-CVE-2026-9679

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Source

https://ubuntu.com/security/CVE-2026-9679

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9679.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-9679

Upstream

CVE-2026-9679

Published

2026-06-17T18:18:00Z

Modified

2026-06-24T11:00:55.198874069Z

Severity

5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

Impact: undici's cookie parser in parseSetCookie percent-decodes cookie values via qsUnescape, turning encoded sequences like %0D%0A, %00, %3B, and %3D into their literal byte equivalents. RFC 6265 §5.4 does not specify any decoding and browsers do not decode either. Applications that parse a Set-Cookie header and then forward the parsed value into a response header (proxies, middleware, SSR frameworks) become vulnerable to HTTP response header injection: an attacker-controlled upstream can inject arbitrary Set-Cookie, Location, or Cache-Control headers into the application's downstream response, enabling session fixation, open redirect, or cache poisoning. Affected applications are those that use undici's cookie parsing (parseSetCookie, parseCookie, getSetCookies) and forward the parsed cookie value into a response header. This was introduced in undici 7.0.0 via PR #3789. Patches: Upgrade to undici v6.26.0, v7.28.0 or v8.5.0. Workarounds: If upgrade is not immediately possible, do not forward values returned by parseSetCookie/parseCookie/getSetCookies directly into response headers; sanitize the value first to strip or reject CR, LF, NUL, ;, and = bytes.

References

Affected packages

Ubuntu:24.04:LTS / node-undici

Package

Name: node-undici
Purl: pkg:deb/ubuntu/node-undici?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

5.*

5.22.1+dfsg1+~cs20.10.10.2-1ubuntu1

5.26.3+dfsg1+~cs23.10.12-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "node-llhttp",
            "binary_version": "9.1.3~5.26.3+dfsg1+~cs23.10.12-2"
        },
        {
            "binary_name": "node-undici",
            "binary_version": "5.26.3+dfsg1+~cs23.10.12-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9679.json"

Ubuntu:25.10 / node-undici

Package

Name: node-undici
Purl: pkg:deb/ubuntu/node-undici?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.3.0+dfsg1+~cs24.12.11-1

7.3.0+dfsg1+~cs24.12.11-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libllhttp9.2",
            "binary_version": "9.2.1~7.3.0+dfsg1+~cs24.12.11-2"
        },
        {
            "binary_name": "node-llhttp",
            "binary_version": "9.2.1~7.3.0+dfsg1+~cs24.12.11-2"
        },
        {
            "binary_name": "node-undici",
            "binary_version": "7.3.0+dfsg1+~cs24.12.11-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9679.json"

Ubuntu:26.04:LTS / node-undici

Package

Name: node-undici
Purl: pkg:deb/ubuntu/node-undici?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.3.0+dfsg1+~cs24.12.11-2

7.16.0+dfsg+~cs3.2.0-2

7.18.2+dfsg+~cs3.2.0-1

7.18.2+dfsg+~cs3.2.0-1build1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "node-undici",
            "binary_version": "7.18.2+dfsg+~cs3.2.0-1build1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9679.json"