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Fencer Vulns
medium 5.9

CVE-2026-107348 json

Integer overflow causes an infinite loop in message buffer growth in PgBouncer

published 2026-10-14 25 d ago modified 2026-10-21 19 d ago also BIT-pgbouncer-2026-107348 , EUVD-2026-101498

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

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.

Patch / fix

  • bitnami pgbouncer 1.26.1
  • n/a PgBouncer 1.26.1
  • pgbouncer Debian 14 1.26.1-1

debian advisories DEBIAN-CVE-2026-107348

  • pgbouncer hummingbird 1 1.26.1-1.hum1

red hat advisories RHSA-2026:83843

  • pgbouncer Azure Linux 3.0 1.26.1-1

azure linux advisories AZL-108195

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-107348 updated cvss 5.9

pgbouncer: pgbouncer: Denial of Service via integer overflow in message buffer growth

  • Red Hat Hardened Images pgbouncer 1.26.1-1.hum1
    fixed: vendor fix RHSA-2026:83843

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
23 d ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami pgbouncer
>=1.21.0, <1.26.1
1.26.1

Affected products

  • n/a PgBouncer

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.