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.
References
| Link | Resource |
|---|---|
| https://www.pgbouncer.org/changelog.html |
Configurations
No configuration.
History
14 Oct 2026, 18:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-14 18:17
Updated : 2026-10-16 21:17
NVD link : CVE-2026-107348
Mitre link : CVE-2026-107348
CVE.ORG link : CVE-2026-107348
JSON object : View
Products Affected
No product.