ts-asn1-der has Incorrect DER Encoding of Numbers Leading to Denial of Service and Incorrect Value Representation
Impact
Incorrect number DER encoding can lead to denial on service for absolute values in the range 2**31 -- 2**32 - 1. The arithmetic in the numBitLen didn't take into account that values in this range could result in a negative result upon applying the >> operator, leading to an infinite loop.
In addition, number encoding had a few other issues that resulted it in it not encoding values correctly.
Patches
The issue is patched in version 1.0.4. Users are recommended to upgrade as soon as possible.
Workarounds
If upgrading is not an option, the issue can be mitigated by validating inputs to Asn1Integer to ensure that they are not smaller than -2**31 + 1 and no larger than 2**31 - 1. Although Asn1Integer supports bigint inputs, some additional implementation issues make using bigint as a mitigation inviable, as it will result in incorrect values.
If upgrading is not an option and range checks are impractical or undesirable, input to Asn1Integer can be provided as a buffer to be used directly. Note that this requires computing the correct DER encoding externally.
References
N/A
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @apeleghq/asn1-der | < 1.0.4 | 1.0.4 |
References
- CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-1335, CWE-835- Platform
- npm
- Package
@apeleghq/asn1-der- Disclosed
- 07.04.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-p4qw-7j9g-5h53 - CC BY 4.0
Vulnerability history: @apeleghq/asn1-der
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.