CVE-2026-58163 in Traffic Server
Summary
by MITRE • 07/29/2026
Apache Traffic Server mishandles on-disk cache fields and object lifetimes, corrupting state or crashing.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.
Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
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Analysis
by VulDB Data Team • 07/29/2026
Apache Traffic Server suffers from a critical vulnerability in its on-disk cache management system that manifests through improper handling of cache fields and object lifetimes. This flaw represents a fundamental breakdown in the software's ability to maintain consistent state information when storing and retrieving cached content to persistent storage. The vulnerability stems from inadequate synchronization mechanisms and flawed lifecycle management protocols that govern how cached objects transition between different states within the disk-based caching infrastructure.
The technical implementation of this vulnerability involves race conditions and memory corruption patterns that occur during concurrent access scenarios within the cache subsystem. When multiple threads or processes attempt to manipulate cache entries simultaneously, the system fails to properly coordinate access to shared resources, leading to data inconsistency and potential crashes. This issue is particularly dangerous because it operates at the core caching layer where performance and reliability are paramount for web serving operations.
From an operational impact perspective, this vulnerability creates significant stability risks for organizations relying on Apache Traffic Server as their primary caching solution. The corruption of cache state information can result in complete service outages when the system encounters corrupted cache entries during normal operation. Additionally, the crash conditions introduced by this flaw can lead to denial of service scenarios that disrupt user access and potentially expose underlying system vulnerabilities through unexpected termination states.
The vulnerability aligns with CWE-362, which addresses race conditions in concurrent programming environments, and demonstrates characteristics consistent with CWE-129, concerning improper validation of array indices and buffer overflows. From an attacker perspective, this issue maps to ATT&CK technique T1499.001, specifically targeting the integrity of information systems through cache corruption mechanisms that can lead to service disruption and data manipulation.
Organizations should immediately implement the recommended upgrades to version 9.2.15 or 10.1.4, which contain comprehensive fixes addressing the underlying synchronization issues in the cache management components. These updates include enhanced mutex locking mechanisms, improved state transition handling, and better resource cleanup procedures that prevent the corruption scenarios described in the vulnerability report. Security teams should also consider implementing monitoring solutions to detect potential cache corruption events during the transition period while ensuring proper rollback capabilities are available should deployment issues arise.