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Vulnerability · Published Jul 8, 2026 · Assigned by GitHub_M

CVE-2026-59883Guzzle: Cookie Disclosure and Injection via IP-Address Domains

Medium 4.7

In plain English

A medium-severity session fixation in guzzle from guzzle. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.2%top 93.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12guzzleno fix listedDEBIAN-CVE-2026-59883
Debian:13guzzleno fix listedDEBIAN-CVE-2026-59883
Debian:14guzzle7.12.3-1DEBIAN-CVE-2026-59883
Packagistguzzlehttp/guzzle7.12.3GHSA-g446-98w2-8p5w
Ubuntu:24.04:LTSguzzleno fix listedUBUNTU-CVE-2026-59883
Ubuntu:25.10guzzleno fix listedUBUNTU-CVE-2026-59883
Ubuntu:26.04:LTSguzzleno fix listedUBUNTU-CVE-2026-59883
Ubuntu:26.10guzzleno fix listedUBUNTU-CVE-2026-59883

Affected products (as reported)

VendorProductVersions
guzzle guzzle < 7.12.3

Weakness: CWE-346, CWE-384 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

References