How severe is CVE-2026-27452?

CVE-2026-27452 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-27452 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27452?

CVE-2026-27452 affects Jonathanwilbur Asn1-ts. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27452?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-27452 have an EU (EUVD) identifier?

Yes. CVE-2026-27452 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7726.

When was CVE-2026-27452 published?

CVE-2026-27452 was published on 2026-02-21 and last updated on 2026-06-17.

CVE-2026-27452

CVE-2026-27452 is a medium-severity vulnerability in Jonathanwilbur Asn1-ts with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 9.2
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7726
Weakness: CWE-200
Affected product: Jonathanwilbur Asn1-ts
Published: 2026-02-21
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-27452?: CVE-2026-27452 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-27452 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27452?: CVE-2026-27452 affects Jonathanwilbur Asn1-ts. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27452?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-27452 have an EU (EUVD) identifier?: Yes. CVE-2026-27452 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7726.
When was CVE-2026-27452 published?: CVE-2026-27452 was published on 2026-02-21 and last updated on 2026-06-17.

References

https://github.com/JonathanWilbur/asn1-ts/security/advisories/GHSA-h5rw-vxjr-8q79

Affected products (1)

cpe:2.3:a:jonathanwilbur:asn1-ts:*:*:*:*:*:node.js:*:*

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