PT-2026-21362 · Unknown · Asn.1 Typescript Esm Library

Jonathanwilbur · Published 2026-02-21 · Updated 2026-03-03 · CVE-2026-27452

Positive Technologies (AI Summary)

CVSS v4.0

9.2

Critical

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions ASN.1 TypeScript ESM library versions 11.0.5 and below

Description The ASN.1 TypeScript ESM library, which includes codecs for Basic Encoding Rules (BER) and Distinguished Encoding Rules (DER), has an issue where decoding an INTEGER could potentially leak the underlying ArrayBuffer in versions 11.0.5 and earlier.

Recommendations Update to version 11.0.6 or later.

Exploit

Fix

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

CVE-2026-27452

GHSA-H5RW-VXJR-8Q79

Affected Products

Asn.1 Typescript Esm Library

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27452.json · Exploit
• https://github.com/JonathanWilbur/asn1-ts/security/advisories/GHSA-h5rw-vxjr-8q79 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27452 · Security Note
• https://osv.dev/vulnerability/CVE-2026-27452 · Vendor Advisory
• https://twitter.com/CVEnew/status/2025154179031785475 · Twitter Post
• https://t.me/cveNotify/153998 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2025121740301406694 · Twitter Post
• https://t.me/cveNotify/152705 · Telegram Post
• https://t.me/CVEtracker/45358 · Telegram Post