Home/CVE/An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and can lead to
CVE

CVE-2026-6664

An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and can lead to

An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and can lead to a crash. An unauthenticated remote attacker can crash PgBouncer with a malformed SCRAM authentication packet.

HIGH · CVSS 7.5 EPSS 0.00049
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-190Integer Overflow or Wraparound
▤

Affected Products & Versions

1
pgbouncer< 1.25.2
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 May 2026 · 01:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
msrcCVE-2026-6664
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.pgbouncer.org/changelog.html#pgbouncer-125xRelease Notes
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