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    CVE-2026-6666

    A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server sends an error response without SQLSTATE field.

    Published:May 9, 2026
    Last Modified:May 14, 2026
    EPS:May 9, 2026
    EPSS Score:0.00012
    CVSS Score:5.9

    Affected Products

    Vendor
    Pgbouncer
    Product
    Pgbouncer

    Exploits

    https://github.com/George0Papasotiriou/CVE-2026-6666-XPC-Service-NSKeyedUnarchiver-Deserialization-Attack-macOS-iOS-simulation-

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-6667 (CVSS 4.3) — PgBouncer before 1.25.2 did not perform an appropriate authorization check for the KILL_CLIENT admin command. …
    CVE-2026-6665 (CVSS 8.1) — The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building …
    CVE-2026-6664 (CVSS 7.5) — An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and ca…
    CVE-2025-12819 (CVSS 7.5) — Untrusted search path in auth_query connection handler in PgBouncer before 1.25.1 allows an unauthenticated at…
    CVE-2025-2291 (CVSS 8.1) — Password can be used past expiry in PgBouncer due to auth_query not taking into account Postgres its VALID UNT…
    CVE-2021-3935 (CVSS 8.1) — When PgBouncer is configured to use "cert" authentication, a man-in-the-middle attacker can inject arbitrary S…
    CVE-2021-3672 (CVSS 5.6) — A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Doma…
    CVE-2015-6817 (CVSS 8.1) — PgBouncer 1.6.x before 1.6.1, when configured with auth_user, allows remote attackers to gain login access as …
    CVE-2015-4054 (CVSS 7.5) — PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and cras…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High