CVE-2017-12934

7.5 highEPSS 3.6%

ext/standard/var_unserializer.re in PHP 7.0.x before 7.0.21 and 7.1.x before 7.1.7 is prone to a heap use after free while unserializing untrusted data, related to the zval_get_type function in Zend/zend_types.h. Exploitation of this issue can have an unspecified impact on the integrity of PHP.

Severity

CVSS 3.0

7.5 high

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 3.6% chance of exploitation in the next 30 days; higher than 89% of CVEs (scores of 2026-10-31)
CWE: CWE-416
Published: 2017-08-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

php:php

References

http://php.net/ChangeLog-7.php
http://www.securityfocus.com/bid/100428
https://access.redhat.com/errata/RHSA-2018:1296
https://bugs.php.net/bug.php?id=74101
https://www.debian.org/security/2018/dsa-4080

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