CVE-2026-111808: CWE-191 Integer Underflow (Wrap or Wraparound) in Apache Software Foundation Apache Traffic Server
Description
CVE-2026-111808 is an integer underflow vulnerability in Apache Traffic Server affecting versions 8.0.0 through 8.1.11, 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and 10.2.0. It allows an attacker to exhaust an HTTP/1.1 origin's worker pool by sending a malformed padded HTTP/2 DATA frame. The issue 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 contains a CWE-191 integer underflow vulnerability that can be triggered by a malformed padded HTTP/2 DATA frame. This causes exhaustion of the HTTP/1.1 origin's worker pool, potentially leading to denial of service. The vulnerability affects multiple version ranges from 8.0.0 up to and including 10.2.0. Upgrades to 9.2.16, 10.1.5, or 10.2.1 address this issue.
Potential Impact
The vulnerability can cause denial of service by exhausting the HTTP/1.1 origin's worker pool, impacting availability. There is no impact on confidentiality or integrity according to the CVSS vector. The CVSS score is 8.6 (high severity), reflecting network attack vector, low complexity, no privileges required, no user interaction, and scope change.
Mitigation Recommendations
Users should upgrade Apache Traffic Server to versions 9.2.16, 10.1.5, or 10.2.1 where the vulnerability is fixed. No other mitigation or temporary workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-10-16T20:19:38.638Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad912f44d27ba8daae7aa0c
Added to database: 10/21/2026, 19:31:00 UTC
Last enriched: 10/21/2026, 19:45:35 UTC
Last updated: 10/21/2026, 19:46:44 UTC
Views: 8
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