MediumFix available
pgbouncer — security advisory
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.
- Products
- pgbouncer
- Affected versions
- 1.18.0-1, 1.18.0-1+deb12u1, 1.19.0-1, 1.19.1-1, 1.20.0-1, 1.20.1-1, 1.21.0-1, 1.22.0-1, 1.22.1-1, 1.23.0-1, 1.23.1-1, 1.24.0-2, 1.24.0-3, 1.24.1-1, 1.24.1-1+deb13u1, 1.24.1-1+deb13u2, 1.25.0-1, 1.25.0-2, 1.25.1-1, 1.25.2-1, 1.26.0-1, 1.26.0-2, 1.26.0-3, 1.26.0-4, 1.26.0-5, 1.26.0-6, 1.26.1-1
- Fixed versions
- 1.26.1-1
- CVEs
- CVE-2026-107348
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:00 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2026-107348
pgbouncer
Fixed versions: Not specified
pgbouncer
Fixed versions: Not specified
pgbouncer
Fixed versions: 1.26.1-1
Complete source record
{
"id": "66b3ce2ff1fa3535570b7497db555671f25a0207143d859c77f0b3f62f80a974",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-107348",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-107348",
"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.",
"evidence": "osv:DEBIAN-CVE-2026-107348",
"products": [
{
"name": {
"value": "pgbouncer",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.18.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.18.0-1+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1.19.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.19.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.21.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.22.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.22.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.23.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.23.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.24.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.25.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.25.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.25.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.25.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.26.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.26.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.26.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.26.0-4",
"evidence": "/affected/0/versions"
},
{
"value": "1.26.0-5",
"evidence": "/affected/0/versions"
},
{
"value": "1.26.0-6",
"evidence": "/affected/0/versions"
},
{
"value": "1.26.1-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "pgbouncer",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.24.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.24.1-1+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1.24.1-1+deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "1.25.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.25.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.25.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.25.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.26.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.26.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.26.0-3",
"evidence": "/affected/1/versions"
},
{
"value": "1.26.0-4",
"evidence": "/affected/1/versions"
},
{
"value": "1.26.0-5",
"evidence": "/affected/1/versions"
},
{
"value": "1.26.0-6",
"evidence": "/affected/1/versions"
},
{
"value": "1.26.1-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "pgbouncer",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.26.1-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1.24.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.25.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.25.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.25.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.25.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.26.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.26.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.26.0-3",
"evidence": "/affected/2/versions"
},
{
"value": "1.26.0-4",
"evidence": "/affected/2/versions"
},
{
"value": "1.26.0-5",
"evidence": "/affected/2/versions"
},
{
"value": "1.26.0-6",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-107348",
"aliases": [
"DEBIAN-CVE-2026-107348"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pgbouncer",
"purl": "pkg:deb/debian/pgbouncer?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.18.0-1",
"1.18.0-1+deb12u1",
"1.19.0-1",
"1.19.1-1",
"1.20.0-1",
"1.20.1-1",
"1.21.0-1",
"1.22.0-1",
"1.22.1-1",
"1.23.0-1",
"1.23.1-1",
"1.24.0-2",
"1.24.0-3",
"1.24.1-1",
"1.25.0-1",
"1.25.0-2",
"1.25.1-1",
"1.25.2-1",
"1.26.0-1",
"1.26.0-2",
"1.26.0-3",
"1.26.0-4",
"1.26.0-5",
"1.26.0-6",
"1.26.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-107348.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pgbouncer",
"purl": "pkg:deb/debian/pgbouncer?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.24.1-1",
"1.24.1-1+deb13u1",
"1.24.1-1+deb13u2",
"1.25.0-1",
"1.25.0-2",
"1.25.1-1",
"1.25.2-1",
"1.26.0-1",
"1.26.0-2",
"1.26.0-3",
"1.26.0-4",
"1.26.0-5",
"1.26.0-6",
"1.26.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-107348.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.26.1-1"
}
]
}
],
"package": {
"name": "pgbouncer",
"purl": "pkg:deb/debian/pgbouncer?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.24.1-1",
"1.25.0-1",
"1.25.0-2",
"1.25.1-1",
"1.25.2-1",
"1.26.0-1",
"1.26.0-2",
"1.26.0-3",
"1.26.0-4",
"1.26.0-5",
"1.26.0-6"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-107348.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T17:47:32.299376264Z",
"provider": "osv",
"upstream": [
"CVE-2026-107348"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-107348"
]
},
"related_cves": [
{
"value": "CVE-2026-107348",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 417501,
"published_at": "2026-10-14T18:17:25.43+00:00"
}