CVE-2010-4657

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-11-13 · updated 2026-06-16
Weakness: CWE-772

Description

PHP5 before 5.4.4 allows passing invalid utf-8 strings via the xmlTextWriterWriteAttribute, which are then misparsed by libxml2. This results in memory leak into the resulting output.

Affected products

Debian Linux: 8.0
PHP: from 5.0.0 before 5.4.4 — fixed in 5.4.4
Red Hat Enterprise Linux: 5.0, 6.0

How to fix

Upgrade to a fixed version: PHP 5.4.4. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/cve-2010-4657
https://bugs.launchpad.net/php/%2Bbug/655442
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-4657
https://security-tracker.debian.org/tracker/CVE-2010-4657
https://access.redhat.com/security/cve/cve-2010-4657
https://bugs.launchpad.net/php/%2Bbug/655442
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-4657
https://security-tracker.debian.org/tracker/CVE-2010-4657

Get alerted when CVE-2010-4657 or the next vulnerability affects your stack