🛡️ CVE-2026-6665 — pgbouncer

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-121 NVD
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

PgBouncer buffer overflow in SCRAM

The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-6665 is classified as CWE-121: Stack-based Buffer Overflow. An oversized write to a stack buffer overwrites saved state such as return addresses, which can redirect execution.

Affected software

CVE-2026-6665 is recorded against 2 packages.

  • pgbouncer
  • unknown

Timeline and source

Published on 12 May 2026 and last revised on 24 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

nvd.nist.gov (Web)
www.pgbouncer.org (Web)

CVE-2026-6665 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-121
Public Exploit ✅ No
Source NVD
Published 2026-05-12
Updated 2026-08-12
Modified 2026-07-24
Fix URL N/A

Affected Packages

Software From version Fixed in
pgbouncer — —
unknown — —

Exploit Protection

Are you running pgbouncer?

CVE-2026-6665 carries CVSS 9.5 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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