NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer
Missing validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to crash the process. A malformed message can make the parser report success while leaving a required value unset, which is then dereferenced as a NULL pointer. The crash occurs before any credential is verified, so no valid account is required. Because PgBouncer serves all clients from a single process, this terminates every pooled connection.
BIT-pgbouncer-2026-19888
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: osv:BIT-pgbouncer-2026-19888
pgbouncer
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.26.0
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.26.0"
}
]
}
],
"package": {
"name": "pgbouncer",
"purl": "pkg:bitnami/pgbouncer",
"ecosystem": "Bitnami"
},
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"database_specific": {
"source": "https://github.com/bitnami/vulndb/tree/main/data/pgbouncer/BIT-pgbouncer-2026-19888.json"
}
}
]- Related CVEs
- CVE-2026-19888
Source reference:
/aliases
Publisher severity
high
Source reference: /database_specific/severity
- Event
- #59513 · Revision 1
- Added to Heist Feed
- Publisher date