CVE-2026-21713
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior could be exploited as a timing oracle to infer HMAC values. Node.js already provides timing-safe comparison primitives used elsewhere in the codebase, indicating this is an oversight rather than an intentional design decision. This vulnerability affects **20.x, 22.x, 24.x, and 25.x**.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
node
- Vendor
- nodejs
- Product
- node
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 20.20.1 | affected | semver | Unavailable | 20.20.1 | None listed |
| 22.22.1 | affected | semver | Unavailable | 22.22.1 | None listed |
| 24.14.0 | affected | semver | Unavailable | 24.14.0 | None listed |
| 25.8.1 | affected | semver | Unavailable | 25.8.1 | None listed |
| 4.0 | affected | semver | 4.* | Unavailable | None listed |
| 5.0 | affected | semver | 5.* | Unavailable | None listed |
| 6.0 | affected | semver | 6.* | Unavailable | None listed |
| 7.0 | affected | semver | 7.* | Unavailable | None listed |
| 8.0 | affected | semver | 8.* | Unavailable | None listed |
| 9.0 | affected | semver | 9.* | Unavailable | None listed |
| 10.0 | affected | semver | 10.* | Unavailable | None listed |
| 11.0 | affected | semver | 11.* | Unavailable | None listed |
| 12.0 | affected | semver | 12.* | Unavailable | None listed |
| 13.0 | affected | semver | 13.* | Unavailable | None listed |
| 14.0 | affected | semver | 14.* | Unavailable | None listed |
| 15.0 | affected | semver | 15.* | Unavailable | None listed |
| 16.0 | affected | semver | 16.* | Unavailable | None listed |
| 17.0 | affected | semver | 17.* | Unavailable | None listed |
| 18.0 | affected | semver | 18.* | Unavailable | None listed |
| 19.0 | affected | semver | 19.* | Unavailable | None listed |