Skip to content
Heist/ feed
High

Authentication bypass via second StartupMessage during SCRAM authentication in PgBouncer

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-107350

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-107350

PgBouncer

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "n/a",
    "product": "PgBouncer",
    "versions": [
      {
        "status": "affected",
        "version": "1.17.0",
        "lessThan": "1.26.1",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-107350

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#32473 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement