Medium 6.5Published Jul 8, 2026

CVE-2026-59882guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP.

Updated under an hour ago (2026-10-19 07:10 UTC)

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It affects guzzlephp psr-7. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for guzzlephp psr-7

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-436
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jul 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

guzzlephp psr-7 guzzlephp:psr-7	before 2.12.3	NVD

References

https://github.com/guzzle/psr7/commit/ddd64f17d4cc1f7e5ffe6fd2c989ec7221712580patch
https://github.com/guzzle/psr7/pull/811issue-tracking, patch
https://github.com/guzzle/psr7/releases/tag/2.12.3product, release-notes
https://github.com/guzzle/psr7/security/advisories/GHSA-c2w2-prh8-qm98mitigation, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.