Buffer overflow in PHP
CVE-2026-14355
In PHP versions 8.2.* before 8.2.32, 8.3.* before 8.3.32, 8.4.* before 8.4.23, 8.5.* before 8.5.8, the AES-WRAP-PAD algorithm implementation in OpenSSL extension contains a buffer allocation flaw. The output buffer for the AES key-wrap-with-padding operation is sized from the plaintext length without accounting for RFC 5649 expansion. This may cause OpenSSL to write beyond allocated memory, corrupting heap metadata and triggering application abort.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (18.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- PHP — versions 8.2.0, 8.3.0, 8.4.0
- Debian Linux — versions 12.0
Weakness classification (CWE)
References
- github.com/php/php-src/security/advisories/GHSA-7jrw-539f-x6vr (vendor-advisory, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-14355?
- CVE-2026-14355 is a medium-severity vulnerability in PHP, classified under Heap-based Buffer Overflow. CVSS score: 5.6/10. Published 2026-07-03.
- How severe is CVE-2026-14355?
- Medium severity. CVSS v3 base score is 5.6 out of 10.