CVE-2026-18024

MEDIUM 4.3

PostgreSQL ascii() function reads past end of buffer

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.

CWE	CWE-126
Vendor	n/a
Product	postgresql
Ecosystems	Database
Industries	Technology
Published	Aug 13, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

n/a / PostgreSQL

18 < 18.5 17 < 17.11 16 < 16.15 15 < 15.19 0 < 14.24

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

The PostgreSQL project thanks Hcamael for reporting this problem.