OSEC-2026-14

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Import Source
https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-14.json
JSON Data
https://api.osv.dev/v1/vulns/OSEC-2026-14
Aliases
  • CVE-2026-87735
Published
2026-08-07T13:00:00Z
Modified
2026-09-10T10:15:04Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
RSA signature verification raises undocumented exception
Details

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
Database specific 
{
    "cwe": [
        "CWE-248"
    ],
    "human_link": "https://github.com/ocaml/security-advisories/tree/main/advisories/2026/OSEC-2026-14.md",
    "osv": "https://github.com/ocaml/security-advisories/tree/generated-osv/2026/OSEC-2026-14.json"
}
Credits
    • Thomas Gazagnaire - REPORTER
    • Hannes Mehnert - REMEDIATION_DEVELOPER

Affected packages

opam / mirage-crypto-pk

Package

Name
mirage-crypto-pk
Purl
pkg:opam/mirage-crypto-pk

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.3.0
Type
GIT
Repo
https://github.com/mirage/mirage-crypto.git
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a0f59a0c90eb067505b55a03d3bb104eacd6dd33

Affected versions

0.*
0.6.0
0.6.1
0.6.2
0.7.0
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.8.6
0.8.7
0.8.8
0.8.9
0.8.10
0.9.0
0.9.1
0.9.2
0.10.0
0.10.1
0.10.2
0.10.3
0.10.4
0.10.5
0.10.6
0.10.7
0.11.0
0.11.1
0.11.2
0.11.3
1.*
1.0.0
1.1.0
1.2.0
2.*
2.0.0
2.0.1
2.0.2
2.0.3
2.1.0
2.2.0
v0.*
v0.6.0
v0.6.1
v0.6.2
v0.7.0
v0.8.0
v0.8.1
v0.8.2
v0.8.3
v0.8.4
v0.8.5
v0.8.6
v0.8.7
v0.8.8
v0.8.9
v0.8.10
v0.9.0
v0.9.1
v0.9.2
v0.10.0
v0.10.1
v0.10.2
v0.10.3
v0.10.4
v0.10.5
v0.10.6
v0.10.7
v0.11.0
v0.11.1
v0.11.2
v0.11.3
v1.*
v1.0.0
v1.0.1
v1.1.0
v1.2.0
v2.*
v2.0.0
v2.0.1
v2.0.2
v2.0.3
v2.1.0
v2.2.0

Ecosystem specific 

{
    "affected_bindings": [
        "Mirage_crypto_pk.Rsa.encrypt",
        "Mirage_crypto_pk.Rsa.decrypt",
        "Mirage_crypto_pk.Rsa.PKCS1.encrypt",
        "Mirage_crypto_pk.Rsa.PKCS1.decrypt",
        "Mirage_crypto_pk.Rsa.PKCS1.sig_encode",
        "Mirage_crypto_pk.Rsa.PKCS1.sig_decode",
        "Mirage_crypto_pk.Rsa.PKCS1.sign",
        "Mirage_crypto_pk.Rsa.PKCS1.verify",
        "Mirage_crypto_pk.Rsa.OAEP.encrypt",
        "Mirage_crypto_pk.Rsa.OAEP.decrypt",
        "Mirage_crypto_pk.Rsa.PSS.sign",
        "Mirage_crypto_pk.Rsa.PSS.verify"
    ],
    "opam_constraint": "mirage-crypto-pk {< \"2.3.0\"}"
}

Database specific

source 
"https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-14.json"