CVE-2025-32029

Description

### 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

How to fix CVE-2025-32029

To remediate CVE-2025-32029, upgrade the affected package to a fixed version below.

• —upgrade to 1.0.4 or later

Is CVE-2025-32029 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 1.0.4

CVSS scores

References (4)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2025-32029
• PATCHgithub.com/ApelegHQ/ts-asn1-der
• WEBgithub.com/ApelegHQ/ts-asn1-der/commit/b2bc9032cbe19755d234a27d79e47a7e52993af8
• WEBgithub.com/ApelegHQ/ts-asn1-der/security/advisories/GHSA-p4qw-7j9g-5h53