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Vulnerability record · CVE-2025-1218 · published 25 September 2026

CVE-2025-1218: Heap-based buffer overflow vulnerability

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.

3.4 CVSS 3.1 Low EPSS 0.18% · top 93.0% CWE-122 · Heap-based buffer overflow Received
3.4CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
25 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

References

LinkTags
https://github.com/php/php-src/security/advisories/GHSA-r6x9-5r99-36j7

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Source: NIST National Vulnerability Database (record CVE-2025-1218), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.