CVE-2026-107348 (GCVE-0-2026-107348)

Vulnerability from cvelistv5 – Published: 2026-10-14 17:34 – Updated: 2026-10-16 20:11
VLAI
Title
Integer overflow causes an infinite loop in message buffer growth in PgBouncer
Summary
Integer overflow in the message buffer growth logic (mbuf_make_room) in PgBouncer 1.21.0 through 1.26.0 allows a remote attacker to cause a denial of service when max_packet_size is configured above 2147483648. A packet header declaring a length above 2^31 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 restarted. Since 1.23.0 the overflow is reachable before authentication with a five-byte packet header.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 20:11 UTC
CWE
  • CWE-190 - Integer Overflow or Wraparound
  • CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
PostgreSQL CNA under the redhat root
CNA scorecard C 67/100 over 88 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
n/a PgBouncer Affected: 1.21.0 , < 1.26.1 (semver)
Credits
Thanks to Brian Cosgrove (@cosgroveb) for finding and reporting this issue.
Show details on NVD website
To clipboard 

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