CVE-2026-19888— NULL pointer dereference in SCRAM client-final-message parsing 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.
Missing validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to crash the process. A malformed message can make the parser report success while leaving a required val
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I. Basic Information for CVE-2026-19888
Vulnerability Information
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Vulnerability Title
NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer
Source: CVE Program / CVE List V5
Vulnerability Description
Missing validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to crash the process. A malformed message can make the parser report success while leaving a required value unset, which is then dereferenced as a NULL pointer. The crash occurs before any credential is verified, so no valid account is required. Because PgBouncer serves all clients from a single process, this terminates every pooled connection.
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
空指针解引用
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | PgBouncer | 0 ~ 1.25.2 | - |
|
II. Public POCs for CVE-2026-19888
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Same Patch Batch · n/a · 2026-09-23 · 8 CVEs total
| CVE-2026-6668 | 7.5 HIGH | Integer overflow causes an infinite loop in packet buffer growth 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
-
CVE-2026-6669
Unbounded SCRAM iteration count causes CPU exhaustion in PgB -
CVE-2026-6668
Integer overflow causes an infinite loop in packet buffer gr -
CVE-2026-6667
PgBouncer missing authorization check in KILL_CLIENT admin c -
CVE-2026-6666
PgBouncer crash in kill_pool_logins_server_error -
CVE-2026-6665
PgBouncer buffer overflow in SCRAM
Same weakness: CWE-476
-
CVE-2026-42801
Deference after null check in as_rrc -
CVE-2026-84396
InDesign Desktop | NULL Pointer Dereference (CWE-476) -
CVE-2026-76192
InDesign Desktop | NULL Pointer Dereference (CWE-476) -
CVE-2026-86056
Notepad++: Null pointer dereference in NPPM_SAVESESSION mess -
CVE-2026-48521
Envoy: HTTP/3 connection pool selection null-derefs in ProdC
V. Comments for CVE-2026-19888
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