Integer overflow in PostgreSQL - CVE-2026-15742
Published: August 15, 2026
Vulnerability identifier: #VU142625
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-15742
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to integer overflow in the fuzzystrmatch levenshtein() and levenshtein_less_equal() functions when processing extreme SQL inputs. A remote user can supply crafted input values to direct writes to a huge range of addresses and execute arbitrary code.
Code execution occurs as the operating system user running the database.
Affected software
PostgreSQL
Debian Linux
postgresql-17 (Debian package)
Debian Linux
postgresql-17 (Debian package)
How to mitigate CVE-2026-15742
Install security update from vendor's website.
PostgreSQL - addressed in versions 14.24, 15.19, 16.15, 17.11, 18.5
postgresql-17 (Debian package) - update to 17.11-0+deb13u1
postgresql-17 (Debian package) - update to 17.11-0+deb13u1