Vulnerability in Guzzle Psr7
CVE-2026-59882
guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Prior to 2.12.3, Uri::assertValidHost() does not reject URI host components containing authority delimiters, embedded ports, or malformed IPv6 brackets, allowing Uri::getHost() to disagree with the URI authority used for security or routing decisions. This issue is fixed in version 2.12.3.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Guzzle Psr7 — versions < 2.12.3
- Guzzlephp Psr-7
Weakness classification (CWE)
References
- github.com/guzzle/psr7/security/advisories/GHSA-c2w2-prh8-qm98 (Mitigation, Vendor Advisory)
- github.com/guzzle/psr7/pull/811 (Patch, Issue Tracking)
- github.com/guzzle/psr7/commit/ddd64f17d4cc1f7e5ffe6fd2c989ec7221712580 (Patch)
- github.com/guzzle/psr7/releases/tag/2.12.3 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-59882?
- CVE-2026-59882 is a medium-severity vulnerability in Guzzle Psr7, classified under CWE-436. CVSS score: 4.2/10. Published 2026-07-08.
- How severe is CVE-2026-59882?
- Medium severity. CVSS v3 base score is 4.2 out of 10.