CVE Feed

    Dashboard / CVE / CVE-2026-107350

    CVE-2026-107350

    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.

    Published:Oct 14, 2026
    Last Modified:Oct 17, 2026
    EPS:Oct 14, 2026
    EPSS Score:0.00361
    CVSS Score:8.8

    Affected Products

    Vendor
    Pgbouncer
    Product
    Pgbouncer

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-107349 (CVSS 7.5) — An infinite loop in PgBouncer 1.20.0 through 1.26.0 allows an unauthenticated remote attacker to cause a denia…
    CVE-2026-107348 (CVSS 5.9) — Integer overflow in the message buffer growth logic (mbuf_make_room) in PgBouncer 1.21.0 through 1.26.0 allows…
    CVE-2026-19888 (CVSS 7.5) — Missing validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25…
    CVE-2026-6668 (CVSS 7.5) — Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remot…
    CVE-2026-6669 (CVSS 5.9) — Missing upper bound on the key derivation iteration count accepted during SCRAM authentication to a backend se…
    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-2026-6666 (CVSS 5.9) — A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server sends an error…
    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…

    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