CVE-2026-101017 Trusted Domain Project OpenDMARC opendmarc_policy.c strcasecmp exceptional condition
Remote attackers can cause a denial of service in OpenDMARC by triggering exceptional conditions in the strcasecmp function.
- 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-2026-101017?
CVE-2026-101017 is a medium-severity denial of service vulnerability in Trusted Domain Project OpenDMARC, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was found in Trusted Domain Project OpenDMARC up to 1.4.2. This vulnerability affects the function strcasecmp in the library libopendmarc/opendmarc_policy.c. The manipulation results in handling of exceptional conditions. The attack can be executed remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
Weakness: CWE-755
Which versions are affected by CVE-2026-101017?
How do I fix CVE-2026-101017?
No fix has been published for CVE-2026-101017 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-101017 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101017 exists.
Sources
Also known as DEBIAN-CVE-2026-101017, GHSA-m5jq-5c72-2x8g, UBUNTU-CVE-2026-101017.