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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| aria2_project | aria2c | ≤ 1.37.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | aria2 | No fix yet | — |
| Debian 13 | aria2 | No fix yet | — |
| Debian 12 | aria2 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | aria2 | No fix yet | — |
| Ubuntu 26.04 LTS | aria2 | No fix yet | — |
| Ubuntu 25.10 | aria2 | No fix yet | — |
| Ubuntu 24.04 LTS | aria2 | No fix yet | — |
| Ubuntu 22.04 LTS | aria2 | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | aria2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | aria2 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | aria2 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | aria2 | No fix yet | — |
Advisories 1
- WID-SEC-2026-1524 aria2: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · May 14, 2026