# CVE-2026-54291: Silent channel-binding authentication downgrade via unsupported certificate algorithms

> CVE-2026-54291: Silent channel-binding authentication downgrade via unsupported certificate algorithms. CVSS 5.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-54291
Last updated: 2026-07-09T13:16:25Z

- Published: 2026-07-06 18:55 UTC · Updated: 2026-07-09 13:16 UTC · Assigner: GitHub\_M
- CVSS: 5.9 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS: 0.24%, 14th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-636, CWE-757

## Description

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 vendors and products

- pgjdbc: pgjdbc

## Tracked companies

- [Bitbucket](https://rewindex.com/company/bitbucket.md)
- [Confluence](https://rewindex.com/company/confluence.md)
- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-54291)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-54291)
- [https://github.com/ongres/scram/releases/tag/3.3](https://github.com/ongres/scram/releases/tag/3.3)
- [https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99](https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99)
- [https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-j92g-9f8w-j867](https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-j92g-9f8w-j867)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-54291 · Markdown: https://rewindex.com/cve/CVE-2026-54291.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-54291 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:48.524Z