CVE-2026-59883
Guzzle: Cookie Disclosure and Injection via IP-Address Domains
4.7
MEDIUM
CVSS 3.1
EPSS 0.11%
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.
How to fix CVE-2026-59883
To remediate CVE-2026-59883, upgrade the affected package to a fixed version below.
- —no fix listed
- —upgrade to 7.12.3 or later
Is CVE-2026-59883 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0
- from 0, < 7.12.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N |