CVE-2024-11233: Single byte overread with convert.quoted-printable-decode filter

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-11-24 · updated 2026-06-17
Weakness: CWE-122

Description

In PHP versions 8.1.* before 8.1.31, 8.2.* before 8.2.26, 8.3.* before 8.3.14, due to an error in convert.quoted-printable-decode filter certain data can lead to buffer overread by one byte, which can in certain circumstances lead to crashes or disclose content of other memory areas.

Affected products

PHP: from 8.1.0 before 8.1.31; from 8.2.0 before 8.2.26; from 8.3.0 before 8.3.14 — fixed in 8.1.31, 8.2.26, 8.3.14

How to fix

Upgrade to a fixed version: PHP 8.1.31, 8.2.26, 8.3.14. Check the vendor advisory for mitigations.

References

https://github.com/php/php-src/security/advisories/GHSA-r977-prxv-hc43
https://lists.debian.org/debian-lts-announce/2024/12/msg00007.html
https://security.netapp.com/advisory/ntap-20241220-0008/

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