VULNERABILITY INTELLIGENCE
CVE-2023-29197
CVSS score5.3 MEDIUM
EPSS probability1.22%
CISA KEVNot currently listed
Published2023-04-17
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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.
Weakness classification
- security-advisories@github.com: CWE-436
Primary references
- security-advisories@github.com — Not Applicable
- security-advisories@github.com — Not Applicable
- security-advisories@github.com — Vendor Advisory
- security-advisories@github.com
- security-advisories@github.com — Mailing List, Third Party Advisory
- security-advisories@github.com — Mailing List, Third Party Advisory
- security-advisories@github.com — Technical Description
- af854a3a-2127-422b-91ae-364da2661108 — Not Applicable
- af854a3a-2127-422b-91ae-364da2661108 — Not Applicable
- af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory