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OSEC-2026-14
The RSA decrypt and encrypt functions raise an Invalid_argument exception if the message is smaller than 2. This leads to X509 certificates with a signature value of 0 or 1 to throw this Invalid_argument exception instead of a proper error.
Fix
The fix is to reuse the Insufficient_key exception, which is documented and caught further up in the stack.
Timeline
- July 28th 2026: report to security@ocaml.org
- August 7th: release of mirage-crypto-pk 2.3.0 and security advisory
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
- EUVD-2026-74621Alias
- CVE-2026-87735Alias
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