CVE-2026-87735 json
RSA signature verification raises undocumented exception
published 2026-08-07 3 mo ago modified 2026-11-06 2 d ago also EUVD-2026-74621 , OSEC-2026-14
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 13%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- opam mirage-crypto-pk 2.3.0
- OCaml mirage-crypto-pk 2.3.0
- ocaml-mirage-crypto Debian 14 2.3.0-1
debian advisories DEBIAN-CVE-2026-87735
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 1 mo ago
Exploit prediction
0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| OSV | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| opam | mirage-crypto-pk | <2.3.0 |
2.3.0 |
Affected products
- OCaml mirage-crypto-pk
Classification
- Weakness
-
- CWE-1284 Improper Validation of Specified Quantity in Input
References
Sources
- CVE List CVE-2026-87735
- NVD CVE-2026-87735
- OSV OSEC-2026-14
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.