Vulnerability in Ocaml Mirage-Crypto-Pk

CVE-2026-87735

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.002 (13.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-87735: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-87735?
CVE-2026-87735 is a medium-severity vulnerability in Ocaml Mirage-Crypto-Pk, classified under Improper Validation of Specified Quantity in Input. CVSS score: 4.3/10. Published 2026-09-09.
How severe is CVE-2026-87735?
Medium severity. CVSS v3 base score is 4.3 out of 10.