Integer underflow in PostgreSQL - CVE-2026-16241
Published: August 15, 2026
Vulnerability identifier: #VU142622
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-16241
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to integer underflow in the ECPG client when processing a bytea value lacking the mandatory prefix. A remote privileged user can send a specially crafted bytea value to cause a denial of service.
In rare cases, the overwrite may also cause limited client-specific integrity impact.
Affected software
PostgreSQL
Debian Linux
postgresql-17 (Debian package)
Debian Linux
postgresql-17 (Debian package)
How to mitigate CVE-2026-16241
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