CVE-2026-58164 in Traffic Server
Summary
by MITRE • 07/29/2026
Apache Traffic Server has use-after-free and time-of-check/time-of-use errors in remap configuration handling.
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
The vulnerability in Apache Traffic Server represents a critical security flaw affecting multiple version ranges including 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, and 10.0.0 through 10.1.3. This issue stems from improper handling of remap configuration files which creates dangerous conditions in memory management and resource allocation. The use-after-free vulnerabilities occur when the software attempts to access memory locations that have already been freed, potentially allowing attackers to execute arbitrary code or cause denial of service conditions. These flaws are particularly concerning because they exist within the core configuration handling mechanisms that manage how traffic server routes requests through remap rules.
The time-of-check/time-of-use errors manifest when the system performs validation checks on remap configurations and then subsequently uses those same configurations without revalidating the state, creating opportunities for attackers to manipulate the system between the check and actual usage. This class of vulnerability is categorized under CWE-367 which specifically addresses Time-of-Check to Time-of-Use race conditions, making it highly susceptible to exploitation in concurrent environments where multiple processes or threads might interact with the same configuration resources. The combination of these memory management issues creates a dangerous attack surface that could be leveraged by malicious actors to compromise server integrity and availability.
The operational impact of this vulnerability extends beyond simple system stability concerns as it affects the fundamental routing capabilities of Apache Traffic Server installations. When exploited, these flaws can result in complete service disruption through denial of service attacks or more severe compromises where attackers gain unauthorized access to system resources and potentially escalate privileges. The remediation requires immediate upgrade to version 9.2.15 or 10.1.4 as these releases contain patches that address the underlying memory management issues and race condition scenarios. Organizations using affected versions should prioritize this upgrade immediately, particularly those operating in environments where traffic server serves as a critical component of their network infrastructure.
From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1059 which involves executing malicious code through command injection or similar means that exploit memory corruption vulnerabilities. The use-after-free conditions provide attackers with potential pathways to achieve code execution, while the time-of-check/time-of-use errors create opportunities for privilege escalation attacks. Security teams should implement immediate monitoring for unusual traffic patterns or configuration changes that might indicate exploitation attempts, as these vulnerabilities could be actively targeted in the wild given their severity and the widespread use of Apache Traffic Server across enterprise environments. The fix implemented in versions 9.2.15 and 10.1.4 includes proper memory deallocation handling and additional validation checks to prevent the race conditions that previously enabled exploitation of these flaws.