Vulnerability · Published Sep 9, 2026 · Assigned by mitre
CVE-2026-87735
Medium 4.3
In plain English
A medium-severity security flaw in mirage-crypto-pk from OCaml. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.2%top 86.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An issue was discovered in the mirage-crypto-pk package before 2.3.0 for OCaml. There is an undocumented exception for a small message during RSA decryption or encryption.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ocaml-mirage-crypto | no fix listed | DEBIAN-CVE-2026-87735 |
| Debian:13 | ocaml-mirage-crypto | no fix listed | DEBIAN-CVE-2026-87735 |
| Debian:14 | ocaml-mirage-crypto | 2.3.0-1 | DEBIAN-CVE-2026-87735 |
| Ubuntu:22.04:LTS | ocaml-mirage-crypto | no fix listed | UBUNTU-CVE-2026-87735 |
| Ubuntu:24.04:LTS | ocaml-mirage-crypto | no fix listed | UBUNTU-CVE-2026-87735 |
| Ubuntu:26.04:LTS | ocaml-mirage-crypto | no fix listed | UBUNTU-CVE-2026-87735 |
| Ubuntu:26.10 | ocaml-mirage-crypto | no fix listed | UBUNTU-CVE-2026-87735 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OCaml | mirage-crypto-pk | 0 – before 2.3.0 |
Weakness: CWE-1284 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L