What is CVE-2026-27452?

CVE-2026-27452 is a medium-severity vulnerability in Jonathanwilbur Asn1-Ts, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-02-21.

How severe is CVE-2026-27452?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in Jonathanwilbur Asn1-Ts

CVE-2026-27452

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.

Vulnerability class: Information Disclosure

EPSS: 0.003 (17.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Jonathanwilbur Asn1-ts — versions <= 11.0.5

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-27452?: CVE-2026-27452 is a medium-severity vulnerability in Jonathanwilbur Asn1-Ts, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-02-21.
How severe is CVE-2026-27452?: Medium severity. CVSS v3 base score is 5.3 out of 10.