Buffer overflow in PHP Group
CVE-2025-1218
The mysqlnd wire protocol parser reads fields out of server packets before checking that the packet still holds enough bytes for them. A malicious or compromised MySQL server can send a truncated packet and make the client read past the end of the packet buffer, which is undefined behaviour and can crash the process.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 3.4 (Low). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/php/php-src/security/advisories/GHSA-r6x9-5r99-36j7 (vendor-advisory)
Frequently asked questions
- What is CVE-2025-1218?
- CVE-2025-1218 is a low-severity vulnerability in PHP Group, classified under Heap-based Buffer Overflow. CVSS score: 3.4/10. Published 2026-09-25.
- How severe is CVE-2025-1218?
- Low severity. CVSS v3 base score is 3.4 out of 10.