Bug 2498137 (CVE-2026-59883) - CVE-2026-59883 guzzle/guzzle: Guzzle: Cross-host cookie disclosure and injection due to improper domain matching in CookieJar.
Summary: CVE-2026-59883 guzzle/guzzle: Guzzle: Cross-host cookie disclosure and inject...
Keywords:
Status: NEW
Alias: CVE-2026-59883
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-08 17:01 UTC by OSIDB Bzimport
Modified: 2026-07-30 11:16 UTC (History)
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Description OSIDB Bzimport 2026-07-08 17:01:24 UTC 
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.
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