CVE-2026-8367: CWE-295 Improper certificate validation in aria2_project aria2c
CVE-2026-8367 is a medium severity vulnerability in aria2c where the client improperly validates server certificates by accepting certificates with incorrect Extended Key Usage (EKU). This flaw could allow attackers who have compromised a certificate issued for a different purpose to reuse it for TLS server authentication, potentially undermining the security of TLS connections.
AI Analysis
Technical Summary
The vulnerability in aria2c involves improper certificate validation related to Extended Key Usage (CWE-295). Specifically, aria2c accepts server certificates even if their EKU fields do not correctly indicate suitability for TLS server authentication. An attacker who compromises a certificate and its private key, originally issued for a different purpose, may exploit this weakness to impersonate a legitimate TLS server to aria2c clients.
Potential Impact
The impact is limited to the confidentiality and integrity of TLS connections established by aria2c. An attacker with a compromised certificate could perform man-in-the-middle attacks by presenting a misused certificate, potentially leading to partial disclosure or manipulation of data. The CVSS score of 4.8 reflects a medium severity with low confidentiality and integrity impact and no availability impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor the aria2_project advisories for updates and apply any forthcoming patches promptly.
CVE-2026-8367: CWE-295 Improper certificate validation in aria2_project aria2c
Description
CVE-2026-8367 is a medium severity vulnerability in aria2c where the client improperly validates server certificates by accepting certificates with incorrect Extended Key Usage (EKU). This flaw could allow attackers who have compromised a certificate issued for a different purpose to reuse it for TLS server authentication, potentially undermining the security of TLS connections.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in aria2c involves improper certificate validation related to Extended Key Usage (CWE-295). Specifically, aria2c accepts server certificates even if their EKU fields do not correctly indicate suitability for TLS server authentication. An attacker who compromises a certificate and its private key, originally issued for a different purpose, may exploit this weakness to impersonate a legitimate TLS server to aria2c clients.
Potential Impact
The impact is limited to the confidentiality and integrity of TLS connections established by aria2c. An attacker with a compromised certificate could perform man-in-the-middle attacks by presenting a misused certificate, potentially leading to partial disclosure or manipulation of data. The CVSS score of 4.8 reflects a medium severity with low confidentiality and integrity impact and no availability impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor the aria2_project advisories for updates and apply any forthcoming patches promptly.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- tenable
- Date Reserved
- 2026-05-11T20:46:54.600Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a049726cbff5d8610e01004
Added to database: 5/13/2026, 3:22:14 PM
Last enriched: 5/13/2026, 3:37:30 PM
Last updated: 5/13/2026, 4:42:00 PM
Views: 4
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