CVE-2026-55767
Guzzle: Dot-Only Cookie Domains Match All Hosts in guzzlehttp/guzzle
At a glance
- Source
- NVD
- EPSS
- EPSS 0.21 % · percentile 11 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Modified
Description
Guzzle is an extensible PHP HTTP client. Prior to 7.12.1, CookieJar incorrectly accepts cookies with a dot-only Domain attribute and whitespace-padded variants. SetCookie::matchesDomain() removes leading dots from the cookie domain, normalizing dot-only values to the empty string; SetCookie::validate() only rejected a strictly empty domain, so these cookies could be stored and the empty normalized domain was treated as matching any request host. An attacker-controlled origin that an application requests with a shared cookie jar can therefore set a cookie that Guzzle later sends to unrelated hosts using the same jar. This may allow cookie injection or session fixation against downstream services, depending on how those services interpret the injected cookie. This vulnerability is fixed in 7.12.1.
Weaknesses (CWE)
References
- https://github.com/guzzle/guzzle/security/advisories/GHSA-cwxw-98qj-8qjx
- https://github.com/guzzle/guzzle/pull/3653
- https://github.com/guzzle/guzzle/commit/7f537cded1912349abf5081258d6db19106d774d
- https://github.com/FriendsOfPHP/security-advisories/blob/master/guzzlehttp/guzzle/CVE-2026-55767.yaml
- https://github.com/guzzle/guzzle/releases/tag/7.12.1
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N | GitHub_M |
| CVSS 3.1 | MEDIUM 5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-cwxw-98qj-8qjx — guzzlehttp/guzzle: Dot-Only Cookie Domains Match All Hosts
European references
- ENISA EUVD · EUVD-2026-38457
- GCVE · GCVE-0-2026-55767
Affected configurations (NVD CPE)
cpe:2.3:a:guzzlephp:guzzle:*:*:*:*:*:*:*:*< 7.12.1
Affected products
| Product | Versions |
|---|---|
| guzzle · guzzle | affected < 7.12.1 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |