Node.js CVE-2026-32256
HIGH
GHSA-v6c2-xwv6-8xf7
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3Blast Radius
ecosystem impact- 5 npm packages depend on music-metadata (5 direct, 0 indirect)
Ecosystem-wide dependent count for version 11.12.3.
DescriptionGitHub Advisory
Summary
music-metadata's ASF parser (parseExtensionObject() in lib/asf/AsfParser.ts:112-158) enters an infinite loop when a sub-object inside the ASF Header Extension Object has objectSize = 0.
Root Cause
When objectSize is 0:
remaining = 0 - 24 = -24tokenizer.ignore(-24)moves the read position backward by 24 bytesextensionSize -= 0(loop counter never decreases)while (extensionSize > 0)never exits- The same 24-byte header is re-read infinitely
This is the same pattern as CVE-2026-31808 (GHSA-5v7r-6r5c-r473) in file-type - strtok3's AbstractTokenizer.ignore() accepts negative values without validation.
Affected Methods
parseFile()- HANGS (FileTokenizer inherits vulnerable ignore())parseBuffer()- HANGS (BufferTokenizer inherits vulnerable ignore())parseStream()- NOT affected (ReadStreamTokenizer has own ignore() that throws RangeError)
Impact
A 100-byte crafted .asf file permanently hangs any application using parseFile() or parseBuffer(). music-metadata has 2.2M weekly npm downloads.
Suggested Fix
Validate objectSize >= minimumHeaderSize before calculating the payload. Or fix strtok3's AbstractTokenizer.ignore() to reject negative values.
AnalysisAI
CVE-2026-32256 is a security vulnerability (CVSS 7.5). High severity vulnerability requiring prompt remediation.
Technical ContextAI
Vulnerability type not specified by vendor. CVSS 7.5 indicates high severity.
RemediationAI
Monitor vendor channels for patch availability.
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External POC / Exploit Code
Leaving vuln.today