Medium [CVE-2026-59883] Cross-host cookie disclosure and injection due to improper domain matching in CookieJar.
This medium-severity Red Hat Linux advisory covers CVE-2026-59883.
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Summary
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. This vulnerability could allow a remote attacker to disclose cookies across different hosts, inject malicious cookies, or fixate user sessions, potentially leading to unauthorized access or session hijacking.
Red Hat's products are not affected by this flaw because the guzzlehttp/guzzle PHP library is not shipped in any Red Hat product. Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N).
Weakness: CWE-472.
- < 7.12.3
- < 192.168.0.1
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- Use a separate CookieJar instance per host or trust boundary. Do not store cookies scoped to IP-address or bare-numeric domains in a shared jar.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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