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🛡️ OSEC-2026-14 — mirage-crypto-pk

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

RSA signature verification raises undocumented exception

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: Low — limited, and the attacker does not choose what is affected.

Affected software

OSEC-2026-14 is recorded against 1 package.

  • mirage-crypto-pk (fixed in 2.3.0)

Timeline and source

Published on 7 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-08-07
Updated 2026-08-20
Modified 2026-08-07
Fix URL N/A

Affected Packages

Software From version Fixed in
mirage-crypto-pk — 2.3.0

References

N/A

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