CVE-2026-59882 | guzzlehttp/psr7 is a PSR-7 HTTP message library implementati… | CVSS 4.2 MEDIUM

Description

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.

Metadata

CVE ID: CVE-2026-59882
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-07-07 16:40 UTC
Published: 2026-07-08 15:50 UTC
Last updated: 2026-07-08 17:00 UTC
Primary CWE: CWE-436
CWE-436: Interpretation Conflict
Vendor / Product: guzzle / psr7
Sources: cve.org · NVD

Severity & Metrics

4.2 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
guzzle	psr7	—	< 2.12.3

Weakness (CWE)

CWE	Source	Description
CWE-436	cna	CWE-436: Interpretation Conflict

CVSS scores (1)

Score	Severity	Version	Source	Vector
4.2	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

References (4)

https://github.com/guzzle/psr7/security/advisories/GHSA-c2w2-prh8-qm98 https://github.com/guzzle/psr7/security/advisories/GHSA-c2w2-prh8-qm98
https://github.com/guzzle/psr7/pull/811 https://github.com/guzzle/psr7/pull/811
https://github.com/guzzle/psr7/commit/ddd64f17d4cc1f7e5ffe6fd2c989ec7221712580 https://github.com/guzzle/psr7/commit/ddd64f17d4cc1f7e5ffe6fd2c989ec7221712580
https://github.com/guzzle/psr7/releases/tag/2.12.3 https://github.com/guzzle/psr7/releases/tag/2.12.3