CVE-2026-59883mediumCWE-346CWE-384

CVE-2026-59883: medium-severity vulnerability in guzzle

Guzzle: Cookie Disclosure and Injection via IP-Address Domains

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 4.7epss 0.2%
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:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
guzzle · guzzle
Related CVEs — guzzle

In the same product, most dangerous first.

CVE-2022-31042HIGHFailure to strip the Cookie header on change in host or HTTP downgrade in GuzzleEPSS 2.0%CVE-2022-31043HIGHFix failure to strip Authorization header on HTTP downgrade in GuzzleEPSS 2.0%CVE-2022-31090HIGHCURLOPT_HTTPAUTH option not cleared on change of origin in GuzzleEPSS 1.9%CVE-2022-31091HIGHChange in port should be considered a change in origin in GuzzleEPSS 1.6%CVE-2022-29248HIGHCross-domain cookie leakage in GuzzleEPSS 1.4%CVE-2026-67353MEDIUMguzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of ServiceEPSS 0.4%