Security-control bypass via oversized ASN.1 OID arcs
Published Nov 26, 2025 · Updated Nov 28, 2025
Integer overflow in Forge before 1.3.2 allows remote attackers to bypass downstream OID-based security decisions with crafted ASN.1 input. The asn1.derToOid function in lib/asn1.js decodes each untrusted OID arc with a JavaScript left shift, coercing the value to a signed 32-bit integer and silently wrapping oversized arcs. Reachability requires a downstream application to pass attacker-controlled ASN.1 to this decoder and then trust the resulting OID; successful exploitation substitutes a malicious certificate OID for an expected trusted identifier.
Summary
What happened
Integer overflow in Forge before 1.3.2 allows remote attackers to bypass downstream OID-based security decisions with crafted ASN.1 input. The asn1.derToOid function in lib/asn1.js decodes each untrusted OID arc with a JavaScript left shift, coercing the value to a signed 32-bit integer and silently wrapping oversized arcs. Reachability requires a downstream application to pass attacker-controlled ASN.1 to this decoder and then trust the resulting OID; successful exploitation substitutes a malicious certificate OID for an expected trusted identifier.
The record
- CVE
- CVE-2025-66030
- Published
- Nov 26, 2025
- Updated
- Nov 28, 2025
- Vendor
- Digital Bazaar
- Product
- Forge
- Classifications
- CWE-190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 26, 2025CVE publishedPublication date reported by the CVE source.
- Nov 28, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 1.3.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
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Your stack
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