CVE WatchNov 12, 2026

CVE-2026-16240

Use of externally-controlled format string in PostgreSQL pg_basebackup allows an attacker having already compromised a server to achieve dis

CVSS

3.7

Low

EPSS

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KEV

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Exploit Today

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0-100

Published: Nov 12, 2026 · Last modified: Nov 12, 2026 · CWE-134

EPSS · 30d

Not enough EPSS history yet.

Technical description

Use of externally-controlled format string in PostgreSQL pg_basebackup allows an attacker having already compromised a server to achieve disclosure from pg_basebackup memory, via backup manifest bytes. The vulnerability does not return the improperly-read bytes back to the attacker's server, so a successful attack would need separate implementation-specific secrets for that. Integrity impact is unlikely; in particular, the applicable formatter does not support %n. Versions before PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.

Official references

www.postgresql.orghttps://www.postgresql.org/support/security/CVE-2026-16240/

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39.6%

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