CVE-2026-27452 PUBLISHED

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

Assigner: GitHub_M
Reserved: 19.02.2026 Published: 21.02.2026 Updated: 21.02.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 9.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	JonathanWilbur
Product	asn1-ts
Versions	Version <= 11.0.5 is affected

References

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

Problem Types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE