CVE-2026-6665

criticalpriority · track · 39EPSS 0.004 · 31 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.37% (31st) EPSS

CVSS 9.8 · critical

Is it mine?

9 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.18.1highAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 2.2 · impact 5.9

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-121USCWE-121US

affected products (9)

Products and version ranges known to be affected.

Microsoft Azure Linux azl3all versionscert_bundDEcpe:/o:microsoft:azure_linux:azl3
Open Source PgBouncer <1.25.2all versionscert_bundDE
Open Source PgBouncer< 1.25.2cert_bundDE
n/a PgBouncer0 → 1.25.2enisa_euvdEU
ООО «Ред Софт» РЕД ОС≤ 8.0fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
Сообщество свободного программного обеспечения PgBouncer≤ 1.25.2fstec_bduRU
pgbouncer pgbouncer< 1.25.2nvdUScpe:2.3:a:pgbouncer:pgbouncer:*:*:*:*:*:*:*:*
Bitnami pgbouncer< 1.25.2osvUSpkg:bitnami/pgbouncer

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1445PgBouncer: Mehrere SchwachstellenDeutsch2026-05-10csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in PgBouncer ausnutzen, um einen Denial of Service Angriff durchzuführen oder nicht näher spezifizierte Angriffe durchzuführen.
BIT-pgbouncer-2026-6665PgBouncer buffer overflow in SCRAM2026-05-12vendor · osvUS
The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd osv NVD CVE.org MITRE

published 2026-05-09modified 2026-07-28

references (5)

External citations — patches, advisories, analysis.

scry

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