CVE-2026-54291
PostgreSQL JDBC Driver: Silent channel-binding authentication downgrade via unsupported certificate algorithms
Impact
pgjdbc is an open source postgresql JDBC Driver. In releases 42.7.4 through 42.7.11, channelBinding=require connections can be silently downgraded from SCRAM-SHA-256-PLUS with channel binding to plain SCRAM-SHA-256 without it, losing the man-in-the-middle protection the setting is meant to guarantee. An attacker who can intercept the TLS connection can trigger the downgrade with a certificate whose signature algorithm has no tls-server-end-point channel-binding hash, because the bundled com.ongres.scram:scram-client returns an empty byte array instead of failing and pgJDBC ScramAuthenticator checks only that the server advertised a PLUS mechanism, without rejecting the empty binding or checking that the negotiated mechanism uses channel binding. This issue is fixed in version 42.7.12.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | org.postgresql:postgresql | >= 42.7.4, < 42.7.12 | 42.7.12 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Postgresql | Postgresql Jdbc Driver | from 42.7.4 before 42.7.12 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-j92g-9f8w-j867
- https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-j92g-9f8w-j867
- https://nvd.nist.gov/vuln/detail/CVE-2026-54291
- https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99
- https://github.com/ongres/scram/releases/tag/3.3