---
cve: "CVE-2026-54291"
severity: "HIGH"
cvss: 8.2
epss: "20%"
vendor: "pgjdbc"
kev: false
exploited: false
published: "2026-07-06 19:17:08"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T13:01:35+02:00"
---

# CVE-2026-54291

> 8.2 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- f6bd6e20e34d4989ee34b06825791657a2cfd4fe (Commit)
- 77df98e4e66c12936ded3478a0954f6f580bad99 (Commit)

## Referenzen

- <https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-j92g-9f8w-j867>
- <https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99>
- <https://github.com/ongres/scram/releases/tag/3.3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-54291) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_