CVE-2026-27452 ASN.1 TypeScript Library: Decoding an INTEGER could leak the underlying ArrayBuffer
Decoding ASN.1 INTEGERs may leak underlying ArrayBuffer data, exposing sensitive memory contents to attackers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27452?
CVE-2026-27452 is a critical vulnerability in JonathanWilbur asn1-ts, published on 21 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-200
Which versions are affected by CVE-2026-27452?
It affects 1 product.
Products include Jonathanwilbur Asn1-Ts.
How do I fix CVE-2026-27452?
No fix has been published for CVE-2026-27452 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-27452 being exploited?
There is no known exploitation of CVE-2026-27452 in the wild and no public exploit code.
Sources
Also known as GHSA-h5rw-vxjr-8q79.