CVE-2023-29197

highpriority · track · 30EPSS 0.012 · 68 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.22% (68th) EPSS

CVSS 7.5 · high

Is it mine?

11 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.3–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · security-advisories@github.comexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · OSV

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-436USCWE-436US

affected products (11)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
guzzle psr7≤ < 1.9.1enisa_euvdEU
guzzle psr72.0.0, → 2.4.5enisa_euvdEU
fedoraproject fedora= 37nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
fedoraproject fedora= 38nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
guzzlephp psr-7< 1.9.1nvdUScpe:2.3:a:guzzlephp:psr-7:*:*:*:*:*:*:*:*
guzzlephp psr-72.0.0 → 2.4.5nvdUScpe:2.3:a:guzzlephp:psr-7:*:*:*:*:*:*:*:*
Packagist guzzlehttp/psr7< 1.9.1osvUSpkg:composer/guzzlehttp/psr7
Packagist guzzlehttp/psr72.0.0 → 2.4.5osvUSpkg:composer/guzzlehttp/psr7

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-1626MediaWiki: Mehrere SchwachstellenDeutsch2023-07-02csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in MediaWiki ausnutzen, um einen nicht näher spezifizierten Angriff und einen Cross-Site-Scripting Angriff duchzuführen.
GHSA-wxmh-65f7-jcvwImproper header name validation in guzzlehttp/psr72023-04-19ghsa · osvUS
### Impact 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`. ### Patches The issue is patched in 1.9.1 and 2.4.5. ### Workarounds There are no known workarounds. ### References * https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2023-04-17modified 2026-06-17

references (22)

External citations — patches, advisories, analysis.

scry

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