CVE-2023-29197mediumCWE-436

CVE-2023-29197: medium-severity vulnerability in guzzle psr7

Improper header name validation in guzzlehttp/psr7

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.3epss 1.2%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products
guzzle · psr7
Related CVEs — guzzle psr7

In the same product, most dangerous first.

CVE-2022-24775HIGHImproper Input Validation in guzzlehttp/psr7EPSS 2.5%CVE-2026-59882MEDIUMguzzlehttp/psr7: Host Confusion via Weak URI Host ValidationEPSS 0.3%CVE-2026-55766MEDIUMguzzlehttp/psr7: CRLF Injection in HTTP Start-Line SerializationEPSS 0.2%CVE-2026-48998MEDIUMguzzlehttp/psr7 has Host Confusion via Authority ReinterpretationEPSS 0.2%CVE-2026-49214MEDIUMguzzlehttp/psr7 has CRLF Injection via URI Host ComponentEPSS 0.2%