CVE-2026-6668

Summary

Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input makes the buffer size computation overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single process, this saturates a CPU core and stalls every pooled connection until the process is killed. Both unauthenticated and authenticated code paths can reach the overflow.

Affected Software

Weaknesses

• CWE-190: Integer Overflow or Wraparound
• CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

Workarounds

Set max_packet_size well below 1073741824 so that no single packet can grow a packet buffer past the overflow threshold

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://www.pgbouncer.org/changelog.html

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