CVE-2026-6874 ericc-ch copilot-api Header token dns rebinding
Remote attackers can exploit DNS rebinding via the Host header in copilot-api to bypass security controls and access internal resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6874?
CVE-2026-6874 is a medium-severity server-side request forgery vulnerability in ericc-ch copilot-api, published on 22 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was determined in ericc-ch copilot-api up to 0.7.0. This impacts an unknown function of the file /token of the component Header Handler. Executing a manipulation of the argument Host can lead to reliance on reverse dns resolution. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
Weakness: CWE-350
Which versions are affected by CVE-2026-6874?
2 open source packages ship an affected version, including copilot-api.
| Package | Affected | Fixed in |
|---|---|---|
copilot-api npm | All versions to 0.7.0 | None |
copilot-api npm | All versions to 0.7.0 | None |
How do I fix CVE-2026-6874?
No fix has been published for CVE-2026-6874 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-6874 being exploited?
There is no known exploitation of CVE-2026-6874 in the wild and no public exploit code.
Sources
Also known as GHSA-3vr4-cvmg-7fx4.