CVE catalog
CVE-2026-55767
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 lead
- Severity
- High · CVSS 7.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.21% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | guzzle | sid | 7.15.5-1 | fixed |
| Debian | guzzle | forky | 7.15.5-1 | fixed |
| Debian | guzzle | trixie | 7.9.2-0.1 | vulnerable |
| Debian | guzzle | bookworm | 7.4.5-1 | vulnerable |
| Cpe | guzzle | Not reported | Not reported | vulnerable |
| Cpe | guzzle | Not reported | 7.12.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | guzzle | source | sid | 7.12.1-1 | not yet assigned | Not reported | Not reported |
| Debian | guzzle | source | forky | 7.12.1-1 | not yet assigned | Not reported | Not reported |
| Debian | guzzle | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | guzzle | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Cpe | guzzle | cpe | Not reported | 7.12.1 | Not reported | Not reported | Not reported |
Notes
[trixie] guzzle: Minor issue [bookworm] guzzle: Minor issue; SetCookie dot-only Domain matches any host
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [php-guzzlehttp-guzzle]Affected
Source package: [guzzle]
Details (2)
7.4.5-1· all · bookwormAffected
nvd · guzzle · debian · bookworm; nvd · guzzle · debian · 12
7.4.5-1· all · bookwormAffected
nvd · guzzle · debian · bookworm; nvd · guzzle · debian · 12
[Debian 13 (Trixie)]
- [php-guzzlehttp-guzzle]Affected
Source package: [guzzle]
Details (2)
7.9.2-0.1· all · trixieAffected
nvd · guzzle · debian · 13
7.9.2-0.1· all · trixieAffected
nvd · guzzle · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-55767]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-55767]
- [https://security-tracker.debian.org/tracker/CVE-2026-55767]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55767.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]