CVE-2026-8367: aria2c accepts a server certificate with incorrect Extended Key Usage (EKU)

Q: How do I fix CVE-2026-8367?

aria2: upgrade to 1.37.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-8367 being exploited?

CVE-2026-8367 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-8367 affect?

CVE-2026-8367 affects aria2. Severity is medium (CVSS 4.8). 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 authenticat

Q: How urgent is CVE-2026-8367?

Priority 27/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 4.8REMOTEUPGRADE

CVE-2026-8367 is a medium-severity flaw (CVSS 4.8) affecting aria2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-295
Published	2026-05-13
Last modified	2026-10-26

Publisher (CNA): Tenable Network Security, Inc. · Vendor: aria2 project

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-13 16:17 UTCPublished CVE record published
2026-10-26 17:10 UTCUpdated Record last modified

aria2 project aria2 UPGRADE

Affected: < 1.37.0

Fixed in: 1.37.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy aria2 || rpm -q aria2 || aria2 --version

2. UPGRADE to 1.37.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade aria2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade aria2

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-8367?

aria2: upgrade to 1.37.0. Exact commands for each OS are on this page.

Is CVE-2026-8367 being exploited?

CVE-2026-8367 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-8367 affect?

CVE-2026-8367 affects aria2. Severity is medium (CVSS 4.8). 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 authenticat

How urgent is CVE-2026-8367?

Priority 27/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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