aria2c Improper Certificate Validation

published 2026-05-13 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-30042 , GHSA-rpx3-3f8j-f6v2 , JLSEC-2026-1347

cvss: 4.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

julia Aria2_jll 1.37.0+0
aria2_project aria2 1.37.0

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 5 mo ago (2026-05-13)

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

tenable.com https://www.tenable.com/security/research/tra-2026-38 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
OSV	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
julia	Aria2_jll	<1.37.0+0	1.37.0+0

Affected products

aria2_project aria2c

Classification

Weakness

CWE-295 Improper Certificate Validation

References

tenable.com /security/research/tra-2026-38
exploit, third-party-advisory, web
github.com /advisories/GHSA-rpx3-3f8j-f6v2
web
nvd.nist.gov /vuln/detail/CVE-2026-8367
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary