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CVE-2026-8367

aria2c Improper Certificate Validation

4.8 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.13%Up 0.1 points since May 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.8

aria2c Improper Certificate Validation

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.

Record
CVE-2026-8367
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-295
Updated
2026-11-02
EUVDEUVD-2026-30042 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 authentication.

Record
EUVD-2026-30042
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-rpx3-3f8j-f6v2 4.8

aria2c accepts a server certificate with incorrect Extended Key Usage (EKU). If the attackers...

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.

Record
GHSA-rpx3-3f8j-f6v2
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-295
Updated
2026-11-02
NVD 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 authentication.

Record
CVE-2026-8367
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-295
Updated
2026-11-02
OSV 4.8

aria2c Improper Certificate Validation

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.

Record
CVE-2026-8367
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-295
Updated
2026-11-02
OSVDEBIAN-CVE-2026-8367 5.3

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.

Record
DEBIAN-CVE-2026-8367
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVJLSEC-2026-1347 5.3

aria2c accepts a server certificate with incorrect Extended Key Usage (EKU). If the attackers...

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.

Record
JLSEC-2026-1347
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-8367 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 authentication.

Record
UBUNTU-CVE-2026-8367
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
aria2
Debian:12
 All versions, plus listed versions
1.36.0-11.36.0-2
 None known
aria2
Debian:13
 All versions, plus listed versions
0.10.1-10.10.2+1-10.11.0-10.11.2-10.11.3-1
Show 45 moreShow less
0.12.0-10.12.1-10.13.1+1-10.14.0-10.14.0-1+lenny10.14.0-1+lenny20.7.3-10.8.0-10.8.1-10.9.0-11.0.1-11.1.2-11.10.0-11.10.0-21.10.6-11.10.9-11.11.1-11.11.2-11.12.0-11.12.1-11.12.1-21.13.0-11.14.0-11.14.1-11.14.2-11.14.2-21.15.0-11.15.0-21.15.1-11.15.2-11.16.0-11.16.1-11.17.0-11.18.0-11.18.0-21.18.1-11.18.10-11.18.10-21.18.3-11.18.5-11.18.7-11.18.8-11.19.0-11.2.0-11.21.0-1
 None known
aria2
Debian:14
 All versions, plus listed versions
0.10.1-10.10.2+1-10.11.0-10.11.2-10.11.3-1
Show 45 moreShow less
0.12.0-10.12.1-10.13.1+1-10.14.0-10.14.0-1+lenny10.14.0-1+lenny20.7.3-10.8.0-10.8.1-10.9.0-11.0.1-11.1.2-11.10.0-11.10.0-21.10.6-11.10.9-11.11.1-11.11.2-11.12.0-11.12.1-11.12.1-21.13.0-11.14.0-11.14.1-11.14.2-11.14.2-21.15.0-11.15.0-21.15.1-11.15.2-11.16.0-11.16.1-11.17.0-11.18.0-11.18.0-21.18.1-11.18.10-11.18.10-21.18.3-11.18.5-11.18.7-11.18.8-11.19.0-11.2.0-11.21.0-1
 None known
Aria2_jll
Julia
 before 1.37.0+0
1.37.0+0
aria2
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
1.17.0-11.18.0-11.18.0-1ubuntu21.18.0-21.18.1-11.18.1-1ubuntu0.1~esm1
 None known
aria2
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.19.0-11.19.0-1build11.19.0-1ubuntu0.1~esm1
 None known
aria2
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.32.0-11.32.0-21.33.1-11.33.1-1ubuntu0.1~esm1
 None known
aria2
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.34.0-41.35.0-11.35.0-1build1
 None known
aria2
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.35.0-31.36.0-1
 None known
aria2
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.36.0-21.37.0+debian-11.37.0+debian-1build11.37.0+debian-1build21.37.0+debian-1build3
 None known
aria2
Ubuntu:25.10
 All versions, plus listed versions
1.37.0+debian-31.37.0+debian-3build1
 None known
aria2
Ubuntu:26.10
 All versions, plus listed versions
1.37.0+debian-4
 None known
aria2
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.37.0+debian-3build11.37.0+debian-4
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-8367 is a medium vulnerability (CVSS 4.8) in Aria2 Project Aria2, published May 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.13%, the 2nd percentile. Fixed in Aria2_jll 1.37.0+0.

References

This page doesn't list everything

Left out here: 70 versions. The JSON record has them.

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