CVE-2026-8367 aria2c Improper Certificate Validation
Attackers can bypass TLS certificate validation by reusing certificates with incorrect Extended Key Usage, enabling man-in-the-middle attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-8367?
CVE-2026-8367 is a medium-severity vulnerability in aria2_project aria2c, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
aria2c accepts a server certificate with incorrect Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.
Weakness: CWE-295
Which versions are affected by CVE-2026-8367?
It affects 1 product.
Products include Aria2 Project Aria2.
How do I fix CVE-2026-8367?
Upgrade to a fixed version.
Is CVE-2026-8367 being exploited?
There is no known exploitation of CVE-2026-8367 in the wild and no public exploit code.
Other vulnerabilities in aria2_project aria2c
Sources
Also known as DEBIAN-CVE-2026-8367, GHSA-rpx3-3f8j-f6v2, JLSEC-2026-1347, UBUNTU-CVE-2026-8367.