CVE-2026-27452

ASN.1 TypeScript Library: Decoding an INTEGER could leak the underlying ArrayBuffer

State: Published
Severity: 9.2 Critical
Published: Feb 21, 2026
Updated: Feb 24, 2026
Reserved: Feb 19, 2026

Description

ASN.1 TypeScript ESM library, including codecs for Basic Encoding Rules (BER) and Distinguished Encoding Rules (DER). In versions 11.0.5 and below, in some cases, decoding an INTEGER could leak the underlying ArrayBuffer. This issue is expected to be fixed in version 11.0.6.

Scores

CVSS	Score	Vector	Source
4.0	9.2 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
asn1-tsJonathanWilbur	<= 11.0.5Affected

References

https://github.com/JonathanWilbur/asn1-ts/security/advisories/GHSA-h5rw-vxjr-8q79

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