CVE-2026-18024

PostgreSQL ascii() function reads past end of buffer

State: Published
Severity: 4.3 Medium
Published: Aug 13, 2026
Updated: Aug 29, 2026
Reserved: Jul 28, 2026

Description

Buffer over-read in PostgreSQL ascii() SQL function allows a user to disclose up to 3 bytes after the end of a specific allocation, via a crafted text value. This is the same class of defect that CVE-2026-2006 fixed, though this instance has less impact. Versions before PostgreSQL 18.6, 17.11, 16.15, 15.19, and 14.24 are affected.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	PostgreSQL

Weaknesses

CWE-126 Buffer Over-read

Affected Products

Product	Versions
PostgreSQLn/a	18 to before 18.6Affected 17 to before 17.11Affected 16 to before 16.15Affected 15 to before 15.19Affected before 14.24Affected

References

https://www.postgresql.org/support/security/CVE-2026-18024/

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.