CVE-2026-27452 CRITICAL

CVE-2026-27452: ASN.1 TypeScript Library: Decoding an INTEGER could leak the underlying ArrayBuffer

Vendor Jonathanwilbur
Product asn1-ts
Weakness CWE-200 · Info exposure
Published February 21, 2026
Last update February 24, 2026
View on NVD All CVEs

CVSS base score

9.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 21, 2026 CVE published
February 24, 2026 Record updated