CVE-2026-87737 json
Timing leak in NIST elliptic curves scalar multiplication
published 2026-08-17 2 mo ago modified 2026-11-06 2 d ago also EUVD-2026-74623 , OSEC-2026-17
- cvss
- 5.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 26%
- public exploits
- 0
- none known
Summary
An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing side channel for NIST elliptic-curve scalar multiplication: the time required for a lookup can depend on a secret.
Patch / fix
- opam mirage-crypto-ec 2.4.0
- OCaml mirage-crypto-ec 2.4.0
- ocaml-mirage-crypto Debian 14 2.4.0-1
debian advisories DEBIAN-CVE-2026-87737
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 1 mo ago
Exploit prediction
0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| opam | mirage-crypto-ec | >=0.11.3, <2.4.0 |
2.4.0 |
Affected products
- OCaml mirage-crypto-ec
Classification
- Weakness
-
- CWE-208 Observable Timing Discrepancy
References
Sources
- CVE List CVE-2026-87737
- NVD CVE-2026-87737
- OSV OSEC-2026-17
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.