Medium severity · published Jul 8, 2026
CVE-2026-59883
Guzzle: Cookie Disclosure and Injection via IP-Address Domains
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
Guzzle is an extensible PHP HTTP client. Prior to 7.12.3, CookieJar did not restrict cookies scoped to IP-address or bare-numeric Domain values to the exact host that set them, because SetCookie::matchesDomain() applied ordinary suffix matching to domains such as 192.168.0.1, [::1], or 1, allowing cross-host cookie disclosure, cookie injection, or session fixation. This issue is fixed in version 7.12.3.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GU
guzzle · guzzle
< 7.12.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59883
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59883
Patch
https://github.com/guzzle/guzzle/commit/b9944c161b12d9ee9c9334cfc5b9659ecd7451f8
Issue Tracking
https://github.com/guzzle/guzzle/pull/3694
Release Notes
https://github.com/guzzle/guzzle/releases/tag/7.12.3
Mitigation
https://github.com/guzzle/guzzle/security/advisories/GHSA-g446-98w2-8p5w
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