Vulnerability · Published May 13, 2026 · Assigned by tenable
CVE-2026-8367aria2c Improper Certificate Validation
Medium 4.8
In plain English
A medium-severity improper certificate validation in aria2c from aria2_project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Severity (CVSS 3.1)4.8Medium
Exploit odds (30 days)0.1%top 97.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | aria2 | no fix listed | DEBIAN-CVE-2026-8367 |
| Debian:13 | aria2 | no fix listed | DEBIAN-CVE-2026-8367 |
| Debian:14 | aria2 | no fix listed | DEBIAN-CVE-2026-8367 |
| Ubuntu:22.04:LTS | aria2 | no fix listed | UBUNTU-CVE-2026-8367 |
| Ubuntu:24.04:LTS | aria2 | no fix listed | UBUNTU-CVE-2026-8367 |
| Ubuntu:25.10 | aria2 | no fix listed | UBUNTU-CVE-2026-8367 |
| Ubuntu:26.04:LTS | aria2 | no fix listed | UBUNTU-CVE-2026-8367 |
| Ubuntu:26.10 | aria2 | no fix listed | UBUNTU-CVE-2026-8367 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| aria2_project | aria2c | 0 – through 1.37.0 |
Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N