CVE-2026-27452: ASN.1 TypeScript ESM library, including codecs for Basic Encoding Rules (BER) and Distinguished Encoding Rules

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-27452 is a medium-severity flaw (CVSS 5.3) affecting asn1-ts. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-02-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: jonathanwilbur

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-21 07:16 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

jonathanwilbur asn1-ts UPGRADE

Affected: < 11.0.6

Fixed in: 11.0.6

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls asn1-ts

2. UPGRADE to 11.0.6

npm install asn1-ts@">=11.0.6"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27452?

asn1-ts: upgrade to 11.0.6. Exact commands for each OS are on this page.

Is CVE-2026-27452 being exploited?

CVE-2026-27452 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27452 affect?

CVE-2026-27452 affects asn1-ts. Severity is medium (CVSS 5.3). 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 expe

How urgent is CVE-2026-27452?

Priority 29/100. Remotely exploitable, no login, no user action

References

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