CVE-2025-15469

Technical Description

Issue summary: The 'openssl dgst' command-line tool silently truncates input

data to 16MB when using one-shot signing algorithms and reports success instead

of an error.

Impact summary: A user signing or verifying files larger than 16MB with

one-shot algorithms (such as Ed25519, Ed448, or ML-DSA) may believe the entire

file is authenticated while trailing data beyond 16MB remains unauthenticated.

When the 'openssl dgst' command is used with algorithms that only support

one-shot signing (Ed25519, Ed448, ML-DSA-44, ML-DSA-65, ML-DSA-87), the input

is buffered with a 16MB limit. If the input exceeds this limit, the tool

silently truncates to the first 16MB and continues without signaling an error,

contrary to what the documentation states. This creates an integrity gap where

trailing bytes can be modified without detection if both signing and

verification are performed using the same affected codepath.

The issue affects only the command-line tool behavior. Verifiers that process

the fu

Remediation

Check the references section for vendor advisories and patches from openssl. Update openssl to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References