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CVE-2026-59882

guzzlehttp/psr7: Host Confusion via Weak URI Host Validation

Published: Jul 8, 2026Updated: Jul 17, 2026 Sources: CVE List NVDCWE-436
4.2MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 91.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-436

Affected Products

guzzlephp
oss-projectaka guzzle
psr-7Library
OSS Libraries / generic-library
guzzle
oss-projectaka guzzlehttp, guzzlehttp/guzzle
psr7Library
OSS Libraries / generic-library

Exploitability

Official Patch Available
Workaround Available

References

https://github.com/guzzle/psr7/commit/ddd64f17d4cc1f7e5ffe6fd2c989ec7221712580
github.com
https://github.com/guzzle/psr7/pull/811
github.com
https://github.com/guzzle/psr7/releases/tag/2.12.3
github.com
and 1 more references View all →

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