CVE-2026-59883

mediumCVSS 4.7covered by 1 sourcefirst seen 2026-07-08

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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Exploitation outlook

Low exploitation risk0.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-59883: Guzzle is an extensible PHP HTTP client. Prior to 7.12.3, CookieJar did not restrict cookies s…nvd · 2026-07-08

External references

NVD record for CVE-2026-59883

CVE.org record

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