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

Quick assessment

Affected
pgjdbc pgjdbc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PostgreSQL JDBC Driver是PostgreSQL组织开源的一个JDBC驱动程序。 PostgreSQL JDBC Driver 42.7.12之前版本存在安全漏洞，该漏洞源于异常处理不当和加密问题，可能导致攻击者通过拦截TLS连接触发channelBinding=require连接从SCRAM-SHA-256-PLUS降级到普通SCRAM-SHA-256丢失中间人保护。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.24% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
pgjdbc pgjdbc >= 42.7.4, < 42.7.12 affected
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I. Basic Information for CVE-2026-54291

Vulnerability Information
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Vulnerability Title
Silent channel-binding authentication downgrade via unsupported certificate algorithms
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未能安全地进行程序失效(Failing Open)
Source: CVE Program / CVE List V5
Vulnerability Title
PostgreSQL JDBC Driver 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PostgreSQL JDBC Driver是PostgreSQL组织开源的一个JDBC驱动程序。 PostgreSQL JDBC Driver 42.7.12之前版本存在安全漏洞，该漏洞源于异常处理不当和加密问题，可能导致攻击者通过拦截TLS连接触发channelBinding=require连接从SCRAM-SHA-256-PLUS降级到普通SCRAM-SHA-256丢失中间人保护。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pgjdbc pgjdbc >= 42.7.4, < 42.7.12 -

II. Public POCs for CVE-2026-54291

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III. Intelligence Information for CVE-2026-54291

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Patches & Fixes for CVE-2026-54291 (1)

Vendor Advisories for CVE-2026-54291 (1)

Other References for CVE-2026-54291 (1)

IV. Related Vulnerabilities

Same product: pgjdbc
Same vendor: pgjdbc
Same weakness: CWE-636

V. Comments for CVE-2026-54291

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