CVE-2026-7568
If a string longer than 2,147,483,647 bytes is passed, a signed integer overflow occurs, resulting in undefined behavior.
Does this matter?
Lower severity and a low EPSS score (0.46%). Track it; it rarely justifies an emergency change on its own.
Description
In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the metaphone() function in ext/standard/metaphone.c uses a signed int variable to track the current position within the input string. If a string longer than 2,147,483,647 bytes is passed, a signed integer overflow occurs, resulting in undefined behavior. This can lead to an out-of-bounds read, causing a segmentation fault or access to unrelated memory, and may affect the availability of the PHP process.
- CVSS 4.0
- 6.3 MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.46% probability · 38th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125, CWE-190
- Affected
- php/php
- Source
- security@php.net
References
- https://github.com/php/php-src/security/advisories/GHSA-96wq-48vp-hh57Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:22142
- https://access.redhat.com/errata/RHSA-2026:22143
- https://access.redhat.com/errata/RHSA-2026:22305
- https://access.redhat.com/errata/RHSA-2026:22649
- https://access.redhat.com/errata/RHSA-2026:23388
- https://access.redhat.com/errata/RHSA-2026:33449
- https://access.redhat.com/errata/RHSA-2026:34354
- https://access.redhat.com/security/cve/CVE-2026-7568
- https://bugzilla.redhat.com/show_bug.cgi?id=2468566
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7568.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.