{"id":"CVE-2026-6668","aliases":["AZL-103433","BIT-pgbouncer-2026-6668","DEBIAN-CVE-2026-6668","EUVD-2026-85363","GHSA-r96c-7w9v-wrc8","RHSA-2026:70698","UBUNTU-CVE-2026-6668"],"status":"published","title":"Integer overflow causes an infinite loop in packet buffer growth in PgBouncer","description":"Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input 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 killed. Both unauthenticated and authenticated code paths can reach the overflow.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00573,"percentile":0.47639,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-190","CWE-835"],"published":"2026-09-23T16:04:47Z","modified":"2026-11-02T14:15:40Z","fixes":[{"ecosystem":"Azure Linux:3","package":"pgbouncer","fixed_in":["1.26.0-1"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"pgbouncer","fixed_in":["1.26.0"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"pgbouncer","fixed_in":["1.26.0-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure 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Hat:hummingbird:1","package":"pgbouncer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.26.0-0.1.hum1"}]}],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"pgbouncer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.5-1","1.6.1-1","1.7-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"pgbouncer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.2-3build1","1.7.2-65-g2b8e6cf-1","1.8.1-1","1.8.1-1build1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"pgbouncer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0-1","1.10.0-1build1","1.11.0-1","1.12.0-2","1.12.0-3"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"pgbouncer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.15.0-1","1.16.1-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"pgbouncer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.20.0-1","1.21.0-1","1.22.0-1","1.22.0-1build1","1.22.0-1build3","1.22.0-1build4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"pgbouncer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.25.1-1","1.25.2-1","1.25.2-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"pgbouncer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.24.1-1","1.25.0-2","1.25.1-1"]}],"references":[{"url":"https://www.pgbouncer.org/changelog.html","tags":["web","article","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6668","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-r96c-7w9v-wrc8"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-6668","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:70698","tags":["advisory"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-6668","tags":["report"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-6669","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-19888","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_70698.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539548","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-6668","tags":["advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539546","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-6669","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6669","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539545","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-19888","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19888","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-6668","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-6668","title":"Integer overflow causes an infinite loop in packet buffer growth in PgBouncer","description":"Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input 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 killed. Both unauthenticated and authenticated code paths can reach the overflow.","status":"published","published":"2026-09-23T16:04:47.158Z","modified":"2026-09-23T16:46:13.834Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-190","CWE-835"],"updated_at":"2026-11-02T13:50:04.986624Z"}],"euvd":[{"id":"EUVD-2026-85363","description":"Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input 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 killed. Both unauthenticated and authenticated code paths can reach the overflow.","status":"published","published":"2026-09-23T16:04:47Z","modified":"2026-09-23T16:46:13Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T17:28:00.617613Z"}],"ghsa":[{"id":"GHSA-r96c-7w9v-wrc8","title":"Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an...","description":"Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input 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 killed. Both unauthenticated and authenticated code paths can reach the overflow.","status":"published","published":"2026-09-23T18:31:56Z","modified":"2026-09-23T18:32:04Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T15:12:21.120874Z"}],"nvd":[{"id":"CVE-2026-6668","description":"Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input 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 killed. Both unauthenticated and authenticated code paths can reach the overflow.","status":"published","published":"2026-09-23T17:17:16.073Z","modified":"2026-09-23T19:40:10Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-190","CWE-835"],"updated_at":"2026-11-02T14:12:50.703874Z"}],"osv":[{"id":"DEBIAN-CVE-2026-6668","description":"Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input 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 killed. Both unauthenticated and authenticated code paths can reach the overflow.","status":"published","published":"2026-09-23T17:17:16.073Z","modified":"2026-10-04T17:00:12.487781904Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:58.699079Z"},{"id":"RHSA-2026:70698","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-09-25T10:15:08Z","modified":"2026-09-25T10:42:49.271036072Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:22.928316Z"},{"id":"UBUNTU-CVE-2026-6668","description":"Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input 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 killed. Both unauthenticated and authenticated code paths can reach the overflow.","status":"published","published":"2026-09-23T17:17:00Z","modified":"2026-10-17T13:00:35.146597721Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:53.710209Z"},{"id":"AZL-103433","title":"CVE-2026-6668 affecting package pgbouncer for versions less than 1.26.0-1","description":"Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input 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 killed. Both unauthenticated and authenticated code paths can reach the overflow.","status":"published","published":"2026-09-23T17:17:16Z","modified":"2026-11-02T14:15:40.881475066Z","updated_at":"2026-11-02T15:28:00.794214Z"},{"id":"BIT-pgbouncer-2026-6668","title":"Integer overflow causes an infinite loop in packet buffer growth in PgBouncer","description":"Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input 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 killed. Both unauthenticated and authenticated code paths can reach the overflow.","status":"published","published":"2026-10-01T09:31:03.502Z","modified":"2026-10-01T10:00:08.885342373Z","updated_at":"2026-11-02T15:28:34.343258Z"}]}}