CVE-2026-6668— Integer overflow causes an infinite loop in packet buffer growth in PgBouncer
Quick assessment
Affected
n/a PgBouncer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 termin
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I. Basic Information for CVE-2026-6668
Vulnerability Information
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Vulnerability Title
Integer overflow causes an infinite loop in packet buffer growth in PgBouncer
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | PgBouncer | 0 ~ 1.25.2 | - |
|
II. Public POCs for CVE-2026-6668
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · n/a · 2026-09-23 · 8 CVEs total
| CVE-2026-19888 | 7.5 HIGH | NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer |
| CVE-2026-79304 | 6.5 MEDIUM | CVE-2026-79304 |
| CVE-2026-79306 | 6.5 MEDIUM | CVE-2026-79306 |
| CVE-2026-6669 | 5.9 MEDIUM | Unbounded SCRAM iteration count causes CPU exhaustion in PgBouncer |
| CVE-2026-95897 | 5.5 MEDIUM | Dask Loader core.py from_npy_stack deserialization |
| CVE-2026-79310 | CVE-2026-79310 | |
| CVE-2025-63564 | CVE-2025-63564 |
IV. Related Vulnerabilities
Same product: PgBouncer
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CVE-2026-6669
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Same weakness: CWE-190
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V. Comments for CVE-2026-6668
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