EXECUTIVE SUMMARY:
CVE-2026-53712 with a CVSS score of 8.2 is a flaw affecting OnGres SCRAM client libraries, specifically versions 3.2 and earlier of the `scram-client` and `scram-common` components. This vulnerability stems from an internal error-handling failure where the library fails to parse modern X.509 certificate signature algorithms, such as Ed25519 or post-quantum algorithms. Instead of raising an exception, the system silently returns an empty byte array, causing the client to misinterpret the environment as lacking channel binding support. An attacker capable of performing a Transport Layer Security (TLS) man-in-the-middle attack can exploit this logic error to force a silent downgrade from `SCRAM-SHA-256-PLUS` to standard `SCRAM-SHA-256`. This capability allows the adversary to bypass strict client-side enforcement policies designed to verify the server's endpoint identity. The business impact is significant, as successful exploitation undermines the integrity of the authentication channel, potentially leading to credential interception or session hijacking. However, exploitation specifically requires a TLS MITM scenario, a server presenting a certificate with unsupported modern algorithms, and a downstream application explicitly configured to enforce strict channel binding requirements.[/subscribe_to_unlock_form]
EXECUTIVE SUMMARY:
CVE-2026-53712 with a CVSS score of 8.2 is a flaw affecting OnGres SCRAM client libraries, specifically versions 3.2 and earlier of the `scram-client` and `scram-common` components. This vulnerability stems from an internal error-handling failure where the library fails to parse modern X.509 certificate signature algorithms, such as Ed25519 or post-quantum algorithms. Instead of raising an exception, the system silently returns an empty byte array, causing the client to misinterpret the environment as lacking channel binding support. An attacker capable of performing a Transport Layer Security (TLS) man-in-the-middle attack can exploit this logic error to force a silent downgrade from `SCRAM-SHA-256-PLUS` to standard `SCRAM-SHA-256`. This capability allows the adversary to bypass strict client-side enforcement policies designed to verify the server's endpoint identity. The business impact is significant, as successful exploitation undermines the integrity of the authentication channel, potentially leading to credential interception or session hijacking. However, exploitation specifically requires a TLS MITM scenario, a server presenting a certificate with unsupported modern algorithms, and a downstream application explicitly configured to enforce strict channel binding requirements.[emaillocker id="1283"]
RECOMMENDATION:
REFERENCES:
The following reports contain further technical details:
https://github.com/advisories/GHSA-p9jg-fcr6-3mhf