What is the CVSS score of CVE-2026-27452?

CVE-2026-27452 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Asn1 Ts are affected by CVE-2026-27452?

CVE-2026-27452 presents moderate security risk, a information exposure vulnerability rated CVSS 5.3. Sensitive information could be exposed to unauthorized parties.

How to fix or mitigate CVE-2026-27452?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review data exposure and access controls.

Asn1 Ts CVE-2026-27452

MEDIUM

Information Exposure (CWE-200)

2026-02-21 security-advisories@github.com

Information Disclosure Asn1 Ts

5.3

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.3 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

CVE Published

Feb 21, 2026 - 07:16 nvd

MEDIUM 5.3

DescriptionGitHub Advisory

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.

AnalysisAI

Asn1 Ts library versions 11.0.5 and below expose sensitive data through unintended ArrayBuffer leakage during INTEGER decoding operations in BER/DER codec processing. Applications using affected versions could inadvertently disclose memory contents to remote attackers without requiring authentication or user interaction. A patch is available in version 11.0.6 and later.

Technical ContextAI

Classified as CWE-200 (Information Exposure). Affects Asn1-Ts. 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.