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TI-2026-05848 Aliases CVE-2026-6665GHSA-mhmx-mjv6-w337

PgBouncer buffer overflow in SCRAM

Priority MEDIUM 43CWE-121Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00372 31st percentileScored 2026-11-07
Fix Fixed PgBouncer: 1.25.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—PgBouncerbefore 1.25.21.25.2Patch availableCNA
  • PgBouncer Vendor— Affected before 1.25.2 Fixed in 1.25.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:pgbouncer:pgbouncer:*:*:*:*:*:*:*:*before 1.25.2VulnerablePgbouncer
  • cpe:2.3:a:pgbouncer:pgbouncer:*:*:*:*:*:*:*:* Versions before 1.25.2 Vulnerable ·Pgbouncer

Remediation

  • Fix · CNA PgBouncer Fixed in 1.25.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    PgBouncer 1.25.2

    4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2026-05847 PgBouncer integer overflow in PgBouncer network packet parsingPriority LOW 34
    • TI-2026-05849 PgBouncer crash in kill_pool_logins_server_errorPriority LOW 33
    • TI-2026-05850 PgBouncer missing authorization check in KILL_CLIENT admin commandPriority LOW 20
    Show all 4 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-6665
  2. 2026-10-03 Alias added: GHSA-mhmx-mjv6-w337

References

Other 1

  • TI-2025-02011 PgBouncer default auth_query does not take Postgres password expiry into account CVSS 3.1CRITICAL 9.8
  • TI-2015-03418 PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer… CVSS 3.0HIGH 7.5
  • TI-2015-05716 PgBouncer 1.6.x before 1.6.1, when configured with auth_user, allows remote attackers to… CVSS 3.0HIGH 8.1
  • TI-2025-11742 Untrusted search path in auth_query connection in PgBouncer CVSS 3.1HIGH 8.1
  • TI-2021-02842 SQL injection in pgbouncer CVSS 3.1HIGH 8.1
  • TI-2026-05847 PgBouncer integer overflow in PgBouncer network packet parsing CVSS 3.1HIGH 7.5
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences