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Vulnerabilities

Vulnerability · CVE-2026-27452

ASN.1 TypeScript ESM library, including codecs for Basic Encoding Rules (BER) and Distinguished Encoding Rules (DER).

Published Feb 21, 2026 · catalog updated Jun 17, 2026 · ASN.1 TypeScript ESM library,

Check if you run it

No confirmed exploitation is on record for CVE-2026-27452. EPSS is 0.35%. Act only if a listed version of ASN.1 TypeScript ESM library, is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (ASN.1 TypeScript ESM library,).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.35%
Remediation
Advisory link
Affected products
cpe jonathanwilbur/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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe jonathanwilbur/asn1-tsversion unspecified

How to fix CVE-2026-27452

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-27452. EPSS is 0.35%. Act only if a listed version of ASN.1 TypeScript ESM library, is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-200: Exposure of Sensitive Information. EPSS 0.35%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 21, 2026 · NIST NVD

    Detected

    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.

  2. Jun 17, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-27452

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-27452

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.