# CVE-2026-59883

## Summary

- **CVE ID:** CVE-2026-59883
- **Severity:** MEDIUM
- **CVSS Score:** 4.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N)
- **CWE:** CWE-346, CWE-384
- **Published:** Jul 8, 2026
- **Last Modified:** Jul 9, 2026

## 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 Products

- guzzle — guzzle (< 7.12.3)

## References

- [CNA](https://github.com/guzzle/guzzle/security/advisories/GHSA-g446-98w2-8p5w)
- [CNA](https://github.com/guzzle/guzzle/pull/3694)
- [CNA](https://github.com/guzzle/guzzle/commit/b9944c161b12d9ee9c9334cfc5b9659ecd7451f8)
- [CNA](https://github.com/guzzle/guzzle/releases/tag/7.12.3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 6.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._