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Vulnerabilities

Vulnerability · CVE-2026-107348

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_…

Published Oct 14, 2026 · catalog updated Oct 15, 2026 · the affected product

Check if you run it

No confirmed exploitation is on record for CVE-2026-107348. EPSS is 0.39%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Advisory link
Affected products
Debian:12 pgbouncer · Debian:13 pgbouncer · Debian:14 pgbouncer

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 pgbouncer1.18.0-1, 1.18.0-1+deb12u1, 1.19.0-1
  • Debian:13 pgbouncer1.24.1-1, 1.24.1-1+deb13u1, 1.24.1-1+deb13u2
  • Debian:14 pgbouncer1.24.1-1, 1.25.0-1, 1.25.0-2

How to fix CVE-2026-107348

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-107348. EPSS is 0.39%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with 1.18.0-1, 1.18.0-1+deb12u1, 1.19.0-1, 1.24.1-1, 1.24.1-1+deb13u1, 1.24.1-1+deb13u2, 1.24.1-1, 1.25.0-1, 1.25.0-2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-190: Integer Overflow; CWE-835: Infinite Loop. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Detected

  2. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    The description or metadata changed.

  3. Oct 14, 2026 · NIST NVD

    Updated

    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 pro

  4. Oct 15, 2026 · NIST NVD

    Updated

    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 pro

Sources

  • CVE.orgVulnerability recordCVE-2026-107348

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-107348

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-107348

    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 c

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-107348
    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.