OpenSSL openssl dgst silent truncation integrity bypass
CVE-2025-15469 is a flaw in the OpenSSL command-line tool 'openssl dgst' affecting the one-shot signing/verification code path. When used with algorithms that only support one-shot operation, including Ed25519, Ed448, ML-DSA-44, ML-DSA-65, and ML-DSA-87, the tool buffers input with a 16 MB limit. If the input exceeds that limit, 'openssl dgst' silently truncates processing to the first 16 MB and still reports success instead of returning an error as documented. As a result, signatures generated or verified through this affected code path may cover only the first 16 MB of a file while trailing bytes remain outside the authenticated data. The issue affects OpenSSL 3.5 and 3.6, specifically the command-line tool behavior; streaming digest algorithms and library API users are not affected.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSL vulnerability patched by upgrading to OpenSSL 3.6.1 in IPFire Core Update 200.
Unknown (listed among related OpenSSL CVEs, but not described in the content).
Low-severity OpenSSL issue where the 'dgst' tool truncates large inputs, potentially impacting integrity/verification workflows relying on correct hashing of very large data.
An OpenSSL vulnerability addressed in Alpine Linux stable releases 3.20.9, 3.21.6, 3.22.3, and 3.23.3.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.