# CVE-2026-100895: Trusted Domain Project OpenARC null pointer dereference in arc_parse_canon_t

Source: https://junglewise.ai/threats/cve-2026-100895-a-security-flaw-has-been-discovered-in-trusted-domain-project  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-28. Updated: 2026-09-28  
License: CC BY 4.0 with a link back

CVE-2026-100895 · Severity: medium · CVSS 5.3 · Published 2026-09-28

Trusted Domain Project OpenARC is a library used for DKIM and ARC email authentication. A null pointer dereference vulnerability in the arc_parse_canon_t function allows remote attackers to cause a denial of service by sending specially crafted email messages. An exploit has been made public, increasing the risk of widespread attacks.

Vendors: [Trusted Domain Project](https://junglewise.ai/threats/vendors/trusted-domain-project).

## Quick answers

**Is CVE-2026-100895 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100895 being exploited in the wild.

**How severe is CVE-2026-100895?** Medium severity, with a CVSS score of 5.3, published 28 September 2026.

**Which products and versions are affected?** Trusted Domain Project OpenARC up to 1.0.0.Beta1.

**Is there a fix for CVE-2026-100895?** A patch was published on 2015-07-02: Version 1.0.0.Beta0 released with fixes Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-100895 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-100895?** Check whether you run Trusted Domain Project OpenARC at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a null pointer dereference in the arc_parse_canon_t function within libopenarc/arc-canon.c, triggered through remote manipulation of input data. The attack requires no authentication or user interaction and can be exploited over the network. A successful exploit crashes the application, resulting in denial of service.

## Affected products

- Trusted Domain Project OpenARC up to 1.0.0.Beta1

## Timeline

- 2026-09-28: disclosed
- 2015-07-02: patched: Version 1.0.0.Beta0 released with fixes

## References

- [https://github.com/trusteddomainproject/OpenARC/releases/tag/v1.0.0.Beta0](https://github.com/trusteddomainproject/OpenARC/releases/tag/v1.0.0.Beta0)
- [https://vuldb.com/cve/CVE-2026-100895](https://vuldb.com/cve/CVE-2026-100895)