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Back to active CVEs
High · CVSS 8.8CVE-2026-107350

Authentication bypass via second StartupMessage during SCRAM authentication in PgBouncerCVE-2026-107350

Answer in brief

CVE-2026-107350 records a High severity (CVSS 8.8) vulnerability in Authentication bypass via second StartupMessage during SCRAM authentication in PgBouncer. The current sources do not mark it as known exploited. The current feed maps n/a/PgBouncer (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 14, 2026Updated Oct 14, 2026Source checked Oct 14, 2026First seen by HOL Oct 14, 2026Material review Oct 14, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps n/a/PgBouncer (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
n/a/PgBouncergeneric>=1.17.0 <1.26.11.26.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for n/a/PgBouncer.
  2. 2Review the reported fix. Update n/a/PgBouncer to 1.26.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 14, 2026

Sources and claim methodology

  • Source referencepgbouncer.org
Upstream source description

Improper authentication in PgBouncer 1.17.0 through 1.26.0 allows a remote attacker who knows the password of a user listed in auth_file to log in as any other user that authenticates using SCRAM, including PgBouncer admin users and backend superusers. A second StartupMessage sent during SCRAM authentication against a non-existent database is not rejected and switches the user being logged in as, while the SCRAM exchange is still verified against the keys of the first user.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Integer overflow causes an infinite loop in message buffer growth in PgBouncerSame n/a/pgbouncer package
  • Infinite loop on empty option name in startup options parameter in PgBouncerSame n/a/pgbouncer package
  • Junos OS and Junos OS Evolved: Unauthenticated network access causes full device takeover when J-Web is enabledAlso CWE-287
  • Improper Authentication in Multiple TP-Link WiFi RepeatersAlso CWE-287
  • PAN-OS: Authenticated Remote Code Execution (RCE) in the Management InterfaceSame generic ecosystem
  • dbt: Unauthenticated Arbitrary SQL Execution in `dbt docs serve`Same generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-287
Source
CVE List V5
Source checked
Oct 14, 2026
References
1 linked source
Open source record