CVE-2026-111805: CWE-400 Uncontrolled Resource Consumption in Apache Software Foundation Apache Traffic Server
Description
CVE-2026-111805 is a high-severity vulnerability in Apache Traffic Server that allows an attacker to exhaust an HTTP/1.1 origin's worker pool by sending a truncated HTTP/2 Content-Length value. This uncontrolled resource consumption issue affects multiple versions of Apache Traffic Server. The vulnerability is fixed in versions 9.2.16, 10.1.5, and 10.2.1.
CVSS v3.1
Score 8.6high
Affected software
Apache Software Foundation
Apache Traffic Server
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Apache Traffic Server versions from 8.0.0 through 8.1.11, 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and version 10.2.0 are vulnerable to an uncontrolled resource consumption issue (CWE-400). The vulnerability arises when an attacker sends a truncated HTTP/2 Content-Length header, which can be used to exhaust the worker pool of an HTTP/1.1 origin server, potentially causing denial of service. This flaw does not impact confidentiality or integrity but results in high impact on availability. The issue is addressed by upgrading to Apache Traffic Server versions 9.2.16, 10.1.5, or 10.2.1.
Potential Impact
The vulnerability allows an attacker to cause denial of service by exhausting the worker pool of an HTTP/1.1 origin server through malformed HTTP/2 requests. This results in high availability impact but does not affect confidentiality or integrity.
Mitigation Recommendations
Users should upgrade Apache Traffic Server to versions 9.2.16, 10.1.5, or 10.2.1 where this issue is fixed. No other mitigation or temporary workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-10-16T20:16:14.017Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad912f44d27ba8daae7aa0b
Added to database: 10/21/2026, 19:31:00 UTC
Last enriched: 10/21/2026, 19:45:39 UTC
Last updated: 10/21/2026, 19:46:44 UTC
Views: 10
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