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CVE-2025-1218GHSA-r6x9-5r99-36j7

PHP: Various packet overreads in mysqlnd_writeprotocol.c

PHP Group PHPRuntimes & languages
Open in ThreatlineRecord JSON
CVSS
3.4Low
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in8.2.34Also 8.3.35, 8.4.26 and 1 moreCVE List
Published25 Sep 2026Updated 28 Sep 2026CVE List

What fixes it

Show all 8 fixed versions

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 8

  • PHPaffected: 8.2.* before 8.2.34CVE List
  • PHPaffected: 8.3.* before 8.3.35CVE List
  • PHPaffected: 8.4.* before 8.4.26CVE List
  • PHPaffected: 8.5.* before 8.5.11CVE List
  • ext-mysqlnd, php<8.2.34GitHub
  • ext-mysqlnd, php<8.3.35GitHub
  • ext-mysqlnd, php<8.4.26GitHub
  • ext-mysqlnd, php<8.5.11GitHub

References 1