cve-2026-6668
HIGH CVSS 7.5 opencve
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.
Timeline
- Published
- 2026-09-23 17:17 UTC
- Last Modified
- 2026-09-23
CVSS Details
CVSS details not available.
Affected Products
No product information available.
CVSS metrics
| Version | Base | Severity | Vector | Exploitability | Impact | Source |
|---|---|---|---|---|---|---|
| 3.1 | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
mitre | ||
| 3.1 | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
nvd | ||
| 3.1 | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
opencve |
References
No references available.
Linked Vulnerabilities
No linked vulnerabilities found.
{
"cve": "CVE-2026-6668",
"enrichment": {
"affected": [
{
"configurations": [
{
"platform": null,
"status": "affected",
"versions": {
"scheme": "generic",
"value": "[0,1.25.2]"
}
}
],
"enrichment": {
"confidence": 80.0,
"confidence_source": "inferred",
"scores": [
{
"score": 80.0,
"source": "inferred"
},
{
"score": 100.0,
"source": "matching"
}
]
},
"original": {
"product": "PgBouncer",
"source": "cna",
"vendor": "n/a"
},
"product": "pgbouncer",
"vendor": "pgbouncer"
}
],
"created": "2026-09-23T18:15:07.179811+00:00",
"updated": "2026-09-23T18:30:06.736528+00:00",
"vendors": [
"pgbouncer",
"pgbouncer$PRODUCT$pgbouncer"
]
},
"mitre": {
"cpes": [],
"created": "2026-09-23T16:04:47.158000+00:00",
"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.",
"metrics": {
"cvssV2_0": {},
"cvssV3_0": {},
"cvssV3_1": {
"score": 7.5,
"vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
"cvssV4_0": {}
},
"mitre_repo_path": "cves/2026/6xxx/CVE-2026-6668.json",
"references": [
"https://www.pgbouncer.org/changelog.html"
],
"title": "Integer overflow causes an infinite loop in packet buffer growth in PgBouncer",
"updated": "2026-09-23T16:46:13.834000+00:00",
"vendors": [],
"weaknesses": [
"CWE-190",
"CWE-835"
]
},
"nvd": {
"cpes": [],
"created": "2026-09-23T17:17:16.073000+00:00",
"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.",
"metrics": {
"cvssV2_0": {},
"cvssV3_0": {},
"cvssV3_1": {
"score": 7.5,
"vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
"cvssV4_0": {}
},
"nvd_repo_path": "2026/CVE-2026-6668.json",
"references": [
"https://www.pgbouncer.org/changelog.html"
],
"title": null,
"updated": "2026-09-23T19:40:10+00:00",
"vendors": [],
"weaknesses": [
"CWE-190",
"CWE-835"
]
},
"opencve": {
"changes": [
{
"created": "2026-09-23T16:30:00+00:00",
"data": [
{
"details": {
"new": "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.",
"old": null
},
"type": "description"
},
{
"details": {
"new": "Integer overflow causes an infinite loop in packet buffer growth in PgBouncer",
"old": null
},
"type": "title"
},
{
"details": {
"added": [
"CWE-190",
"CWE-835"
],
"removed": []
},
"type": "weaknesses"
},
{
"details": {
"added": [
"https://www.pgbouncer.org/changelog.html"
],
"removed": []
},
"type": "references"
},
{
"details": {
"added": {
"cvssV3_1": {
"score": 7.5,
"vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
},
"removed": {},
"updated": {}
},
"type": "metrics"
}
],
"id": "6b8e7f4f-87d4-4065-92d7-7a4160fed984"
},
{
"created": "2026-09-23T17:30:00+00:00",
"data": [
{
"details": {
"added": {
"ssvc": {
"options": {
"Automatable": "yes",
"Exploitation": "none",
"Technical Impact": "partial"
},
"version": "2.0.3"
}
},
"removed": {},
"updated": {}
},
"type": "metrics"
}
],
"id": "aa5fc5bd-d736-4538-af54-e8bd17b93e44"
},
{
"created": "2026-09-23T18:45:00+00:00",
"data": [
{
"details": [
"pgbouncer",
"pgbouncer$PRODUCT$pgbouncer"
],
"type": "first_time"
},
{
"details": {
"added": [
"pgbouncer",
"pgbouncer$PRODUCT$pgbouncer"
],
"removed": []
},
"type": "vendors"
}
],
"id": "d590a715-987e-4da9-b147-33dbc0c161b2"
}
],
"cpes": {
"data": [],
"providers": []
},
"created": {
"data": "2026-09-23T16:04:47.158000+00:00",
"provider": "mitre"
},
"description": {
"data": "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.",
"provider": "mitre"
},
"metrics": {
"cvssV2_0": {
"data": {},
"provider": null
},
"cvssV3_0": {
"data": {},
"provider": null
},
"cvssV3_1": {
"data": {
"score": 7.5,
"vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
"provider": "mitre"
},
"cvssV4_0": {
"data": {},
"provider": null
},
"epss": {
"data": {},
"provider": null
},
"kev": {
"data": {},
"provider": null
},
"ssvc": {
"data": {
"options": {
"Automatable": "yes",
"Exploitation": "none",
"Technical Impact": "partial"
},
"version": "2.0.3"
},
"provider": "vulnrichment"
},
"threat_severity": {
"data": null,
"provider": null
}
},
"references": {
"data": [
"https://www.pgbouncer.org/changelog.html"
],
"providers": [
"mitre",
"nvd"
]
},
"title": {
"data": "Integer overflow causes an infinite loop in packet buffer growth in PgBouncer",
"provider": "mitre"
},
"updated": {
"data": "2026-09-23T18:30:06.736528+00:00",
"provider": "enrichment"
},
"vendors": {
"data": [
"pgbouncer",
"pgbouncer$PRODUCT$pgbouncer"
],
"providers": [
"enrichment"
]
},
"weaknesses": {
"data": [
"CWE-190",
"CWE-835"
],
"providers": [
"mitre",
"nvd"
]
}
},
"vulnrichment": {
"cpes": [],
"created": "2026-09-23T16:04:47.158000+00:00",
"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.",
"metrics": {
"cvssV2_0": {},
"cvssV3_0": {},
"cvssV3_1": {},
"cvssV4_0": {},
"kev": {},
"ssvc": {
"options": {
"Automatable": "yes",
"Exploitation": "none",
"Technical Impact": "partial"
},
"version": "2.0.3"
}
},
"references": [],
"title": "Integer overflow causes an infinite loop in packet buffer growth in PgBouncer",
"updated": "2026-09-23T16:36:55.619000+00:00",
"vendors": [],
"vulnrichment_repo_path": "2026/6xxx/CVE-2026-6668.json",
"weaknesses": []
}
}