# CVE-2026-54291

## Summary

- **CVE ID:** CVE-2026-54291
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N)
- **CWE:** CWE-636, CWE-757
- **Published:** Jul 6, 2026
- **Last Modified:** Jul 6, 2026

## 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 Products

- pgjdbc — pgjdbc (>= 42.7.4, < 42.7.12)

## References

- [CNA](https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-j92g-9f8w-j867)
- [CNA](https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99)
- [CNA](https://github.com/ongres/scram/releases/tag/3.3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 14.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._