CVE-2016-6296

critical
Published 2016-07-25 · Modified 2026-05-06
CVSS v3
9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2
7.5
VIR risk
9.8

Description

Integer signedness error in the simplestring_addn function in simplestring.c in xmlrpc-epi through 0.54.2, as used in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9, allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact via a long first argument to the PHP xmlrpc_encode_request function.

Predictions

Exploit likelihood
97%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2016-6296

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2016-6296.html

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — http://php.net/ChangeLog-7.php

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — http://php.net/ChangeLog-5.php

OS impact

OSVersionStatusFixed in
suse slesaffected
debian debianbookwormfixed0.54.2-1.2
debian debianbullseyefixed0.54.2-1.2
debian debianforkyfixed0.54.2-1.2
debian debiansidfixed0.54.2-1.2
debian debiantrixiefixed0.54.2-1.2

Application impact

VendorProductVersionsFixed
php phpphp{"endIncluding":"5.5.37"}
php phpphp5.6.0
php phpphp5.6.1
php phpphp5.6.2
php phpphp5.6.3
php phpphp5.6.4
php phpphp5.6.5
php phpphp5.6.6
php phpphp5.6.7
php phpphp5.6.8
php phpphp5.6.9
php phpphp5.6.10
php phpphp5.6.11
php phpphp5.6.12
php phpphp5.6.13
php phpphp5.6.14
php phpphp5.6.15
php phpphp5.6.16
php phpphp5.6.17
php phpphp5.6.18
php phpphp5.6.19
php phpphp5.6.20
php phpphp5.6.21
php phpphp5.6.22
php phpphp5.6.23
php phpphp7.0.0
php phpphp7.0.1
php phpphp7.0.2
php phpphp7.0.3
php phpphp7.0.4
php phpphp7.0.5
php phpphp7.0.8

References

CWEs

CWE-119

Verify integrity in audit chain (admin only). AS-IS.