CVE-2026-6664
PgBouncer integer overflow in PgBouncer network packet parsing
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
PgBouncer integer overflow in PgBouncer network packet parsing
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.
- Record
CVE-2026-6664- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-190
- Updated
- 2026-11-02
EUVDEUVD-2026-28876
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.
- Record
EUVD-2026-28876- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-pmgp-q838-fh9g
An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary...
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.
- Record
GHSA-pmgp-q838-fh9g- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-190
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-6664- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-190
- Updated
- 2026-11-02
OSVDEBIAN-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 a crash. An unauthenticated remote attacker can crash PgBouncer with a malformed SCRAM authentication packet.
- Record
DEBIAN-CVE-2026-6664- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-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 a crash. An unauthenticated remote attacker can crash PgBouncer with a malformed SCRAM authentication packet.
- Record
UBUNTU-CVE-2026-6664- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVAZL-86234 No score
CVE-2026-6664 affecting package pgbouncer for versions less than 1.25.2-1
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.
- Record
AZL-86234- Updated
- 2026-11-02
OSVBIT-pgbouncer-2026-6664 No score
PgBouncer integer overflow in PgBouncer network packet parsing
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.
- Record
BIT-pgbouncer-2026-6664- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
pgbouncerAzure Linux:3 |
before 1.25.2-1 | 1.25.2-1 |
pgbouncerBitnami |
before 1.25.2 | 1.25.2 |
pgbouncerDebian:12 |
All versions, plus listed versions 1.18.0-11.18.0-1+deb12u11.19.0-11.19.1-11.20.0-1 Show 17 moreShow less1.20.1-11.21.0-11.22.0-11.22.1-11.23.0-11.23.1-11.24.0-21.24.0-31.24.1-11.25.0-11.25.0-21.25.1-11.25.2-11.26.0-11.26.0-21.26.0-31.26.0-4 |
None known |
pgbouncerDebian:13 |
before 1.24.1-1+deb13u2, plus listed versions 1.24.1-11.24.1-1+deb13u1 |
1.24.1-1+deb13u2 |
pgbouncerDebian:14 |
before 1.25.2-1, plus listed versions 1.24.1-11.25.0-11.25.0-21.25.1-1 |
1.25.2-1 |
pgbouncerUbuntu:16.04:LTS |
All versions, plus listed versions 1.5.5-11.6.1-11.7-1 |
None known |
pgbouncerUbuntu:18.04:LTS |
All versions, plus listed versions 1.7.2-3build11.7.2-65-g2b8e6cf-11.8.1-11.8.1-1build1 |
None known |
pgbouncerUbuntu:20.04:LTS |
All versions, plus listed versions 1.10.0-11.10.0-1build11.11.0-11.12.0-21.12.0-3 |
None known |
pgbouncerUbuntu:22.04:LTS |
All versions, plus listed versions 1.15.0-11.16.1-1ubuntu1 |
None known |
pgbouncerUbuntu:24.04:LTS |
All versions, plus listed versions 1.20.0-11.21.0-11.22.0-11.22.0-1build11.22.0-1build31.22.0-1build4 |
None known |
pgbouncerUbuntu:25.10 |
All versions, plus listed versions 1.24.0-31.24.1-1 |
None known |
pgbouncerUbuntu:26.10 |
All versions, plus listed versions 1.25.1-11.25.2-11.25.2-1ubuntu1 |
None known |
pgbouncerUbuntu:26.04:LTS |
All versions, plus listed versions 1.24.1-11.25.0-21.25.1-1 |
None known |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | nicolasjulian/bouncer-overflow | 2026-05-12 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-6664 is a high vulnerability (CVSS 7.5) in Pgbouncer, published May 9, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.70%, the 53rd percentile. Fixed in pgbouncer 1.25.2-1.