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Fencer Vulns
high 7.5

CVE-2024-2757 json

PHP mb_encode_mimeheader runs endlessly for some inputs

published 2024-04-11 2 y ago modified 2026-09-08 2 mo ago also BIT-libphp-2024-2757 , BIT-php-2024-2757 , BIT-php-min-2024-2757 , EUVD-2024-27701 , GHSA-fjp9-9hwx-59fq

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

In PHP 8.3.* before 8.3.5, function mb_encode_mimeheader() runs endlessly for some inputs that contain long strings of non-space characters followed by a space. This could lead to a potential DoS attack if a hostile user sends data to an application that uses this function.

Patch / fix

  • bitnami libphp 8.3.5
  • bitnami php 8.3.5
  • bitnami php-min 8.3.5
  • PHP Group PHP 8.3.5
  • php8.3 Ubuntu 24.04 LTS 8.3.6-0maysync1

ubuntu advisories UBUNTU-CVE-2024-2757

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • php8 openSUSE Tumbleweed 8.3.6-1.1

opensuse advisories openSUSE-SU-2024:13867-1

  • php83 Alpine 3.19 8.3.6-r0
  • php83 Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 8.3.5-r0

alpine advisories ALPINE-CVE-2024-2757

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • php Azure Linux 3.0 8.3.6-1

azure linux advisories AZL-40055

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-2757 updated cvss 7.5

php: mb_encode_mimeheader runs endlessly for some inputs

  • Red Hat Enterprise Linux 6 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +20 more Red Hat Enterprise Linux 7 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +18 more Red Hat Enterprise Linux 8 php, libzip, php-gd, php-cli, php-dba, php-dbg, +30 more Red Hat Enterprise Linux 9 php, php-gd, php-cli, php-dba, php-dbg, php-ffi, +18 more Red Hat Enterprise Linux 10 php
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.92% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/php/php-src/security/advisories/GHSA-fjp9-9hwx-59fq referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami libphp
>=8.3.0, <8.3.5
8.3.5
bitnami php
>=8.3.0, <8.3.5
8.3.5
bitnami php-min
>=8.3.0, <8.3.5
8.3.5

Affected products

  • PHP Group PHP
  • php_group php

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of php/php-src published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.