CVE-2026-27452CWE-200

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

Critical · published February 21, 2026

CVSS v4.0
9.2
EPSS
0%
Percentile
31.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.2 · CRITICAL
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
EPSS
0.00383 · 31.2th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-02-21T06:50Z
EPSS history
Timeline
  • 21 FEB 06:50Z
    ASN.1 TypeScript Library: Decoding an INTEGER could leak the underlying ArrayBuffer
    cvelistv5