Description
Multiple use-after-free vulnerabilities in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 allow remote attackers to execute arbitrary code via vectors related to (1) the Serializable interface, (2) the SplObjectStorage class, and (3) the SplDoublyLinkedList class, which are mishandled during unserialization.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | php5 | 5.6.13+dfsg-0+deb8u1 | DSA-3358-1 |
| Debian 7 | php5 | 5.4.45-0+deb7u1 | DSA-3358-1 |
| Debian 6.0 | php5 | 5.3.3.1-7+squeeze28 | DLA-341-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | php5 | 5.5.9+dfsg-1ubuntu4.13 | USN-2758-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 2 | rh-php56-php +27 | 5.6.5-8.el6 | RHSA-2016:0457 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | php5 | 5.5.14-36.1 | SUSE-SU-2015:1633-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 2
- PHP 5.4/5.5/5.6 - SplDoublyLinkedList 'Unserialize()' Use-After-Free EDB-38120 · dos · Sep 9, 2015 · verified
- PHP 5.4/5.5/5.6 - SplObjectStorage 'Unserialize()' Use-After-Free EDB-38122 · dos · Sep 9, 2015 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 6
- RHSA-2016:0457 Red Hat Security Advisory: rh-php56-php security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-2758-1 php5 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-341-1 php5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3358-1 php5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2015:1633-1 Security update for php5 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1425 PHP: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 30, 2025
References
- https://bugs.php.net/bug.php?id=70366
- 1033548 vdb-entry
- 76649 vdb-entry
- http://php.net/ChangeLog-5.php
- https://bugs.php.net/bug.php?id=70365
- https://bugs.php.net/bug.php?id=70172
- DSA-3358 vendor-advisory
- GLSA-201606-10 vendor-advisory