Description
guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Affected versions are subject to improper header parsing. An attacker could sneak in a newline (\n) into both the header names and values. While the specification states that \r\n\r\n is used to terminate the header list, many servers in the wild will also accept \n\n. This is a follow-up to CVE-2022-24775 where the fix was incomplete. The issue has been patched in versions 1.9.1 and 2.4.5. There are no known workarounds for this vulnerability. Users are advised to upgrade.
References (7)
Scores
CVSS v3
5.3
EPSS
0.0415
EPSS Percentile
88.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Details
InTheWild.io
2023-04-17
CWE
CWE-436
Status
published
Products (4)
fedoraproject/fedora
37
fedoraproject/fedora
38
guzzlehttp/psr7
0 - 1.9.1Packagist
guzzlephp/psr-7
< 1.9.1
Published
Apr 17, 2023
Tracked Since
Feb 18, 2026