CVE-2026-111811: CWE-306 Missing Authentication for Critical Function in Apache Software Foundation Apache Traffic Server
Description
Apache Traffic Server's experimental tsmemcache plugin has a critical vulnerability (CVE-2026-111811) that allows unauthenticated network read, write, and deletion access to the shared proxy cache. This affects versions from 8.0.0 through 8.1.11, 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and exactly 10.2.0. The issue is fixed in versions 9.2.16, 10.1.5, and 10.2.1.
CVSS v3.1
Score 9.0critical
Affected software
Apache Software Foundation
Apache Traffic Server
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-111811 is a missing authentication vulnerability (CWE-306) in the experimental tsmemcache plugin of Apache Traffic Server. It allows unauthenticated remote attackers to perform read, write, and deletion operations on the shared proxy cache over the network. This can lead to complete compromise of cache integrity and availability. The vulnerability affects multiple version ranges of Apache Traffic Server, specifically >=8.0.0 <=8.1.11, >=9.0.0 <=9.2.15, >=10.0.0 <=10.1.4, and =10.2.0. Upgrading to fixed versions 9.2.16, 10.1.5, or 10.2.1 mitigates the issue.
Potential Impact
An attacker can remotely access and manipulate the shared proxy cache without authentication, potentially leading to full compromise of cache data confidentiality, integrity, and availability. This can disrupt proxy operations and expose sensitive cached information.
Mitigation Recommendations
Users should upgrade Apache Traffic Server to versions 9.2.16, 10.1.5, or 10.2.1, which contain official fixes for this vulnerability. No other mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-10-16T20:21:46.648Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad916a44d27ba8daaf52977
Added to database: 10/21/2026, 19:46:44 UTC
Last enriched: 10/21/2026, 20:00:24 UTC
Last updated: 10/21/2026, 20:00:24 UTC
Views: 4
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