ALPINE-CVE-2026-21713
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**.
ALPINE-CVE-2026-21713
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:ALPINE-CVE-2026-21713
nodejs
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 22.22.2-r0
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
nodejs
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 22.22.2-r0
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
nodejs
Source reference: /affected/2/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 24.14.1-r0
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
nodejs
Source reference: /affected/3/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 24.14.1-r0
Source reference:
/affected/3/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "22.22.2-r0"
}
]
}
],
"package": {
"name": "nodejs",
"purl": "pkg:apk/alpine/nodejs?arch=source",
"ecosystem": "Alpine:v3.21"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-21713.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "22.22.2-r0"
}
]
}
],
"package": {
"name": "nodejs",
"purl": "pkg:apk/alpine/nodejs?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-21713.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "24.14.1-r0"
}
]
}
],
"package": {
"name": "nodejs",
"purl": "pkg:apk/alpine/nodejs?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-21713.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "24.14.1-r0"
}
]
}
],
"package": {
"name": "nodejs",
"purl": "pkg:apk/alpine/nodejs?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-21713.json"
},
"ecosystem_specific": {}
}
]Publisher severity
No explicit severity was provided.
- Event
- #54162 · Revision 1
- Added to Heist Feed
- Publisher date