Node.js CVE-2026-31808
MEDIUM
GHSA-5v7r-6r5c-r473
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Lifecycle Timeline
3DescriptionGitHub Advisory
file-type detects the file type of a file, stream, or data. Prior to 21.3.1, a denial of service vulnerability exists in the ASF (WMV/WMA) file type detection parser. When parsing a crafted input where an ASF sub-header has a size field of zero, the parser enters an infinite loop. The payload value becomes negative (-24), causing tokenizer.ignore(payload) to move the read position backwards, so the same sub-header is read repeatedly forever. Any application that uses file-type to detect the type of untrusted/attacker-controlled input is affected. An attacker can stall the Node.js event loop with a 55-byte payload. Fixed in version 21.3.1.
AnalysisAI
Denial of service in file-type library versions prior to 21.3.1 allows remote attackers to hang Node.js event loops by submitting malformed ASF (WMV/WMA) files that trigger infinite loops during file type detection. Applications using file-type to analyze untrusted input are vulnerable, with a minimal 55-byte payload sufficient to stall processing. …
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Vulnerability AssessmentAI
| Risk Assessment | CVSS 5.3 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | Fixed in version 21.3.1.. … Detailed patch versions, workarounds, and compensating controls in full report. |
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