Vulnerability · Published Sep 9, 2026 · Assigned by mitre
CVE-2026-87737
Medium 5.9
In plain English
A medium-severity security flaw in mirage-crypto-ec from OCaml. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.3%top 73.5% 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-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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ocaml-mirage-crypto | no fix listed | DEBIAN-CVE-2026-87737 |
| Debian:13 | ocaml-mirage-crypto | no fix listed | DEBIAN-CVE-2026-87737 |
| Debian:14 | ocaml-mirage-crypto | 2.4.0-1 | DEBIAN-CVE-2026-87737 |
| Ubuntu:22.04:LTS | ocaml-mirage-crypto | no fix listed | UBUNTU-CVE-2026-87737 |
| Ubuntu:24.04:LTS | ocaml-mirage-crypto | no fix listed | UBUNTU-CVE-2026-87737 |
| Ubuntu:26.04:LTS | ocaml-mirage-crypto | no fix listed | UBUNTU-CVE-2026-87737 |
| Ubuntu:26.10 | ocaml-mirage-crypto | no fix listed | UBUNTU-CVE-2026-87737 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OCaml | mirage-crypto-ec | 0 – before 2.4.0 |
Weakness: CWE-208 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N