CVE-2026-58158

Analyzed Analyzed - Analysis Complete

Stack Overflow in Apache Traffic Server

Publication date: 2026-07-29

Last updated on: 2026-08-03

Assigner: Apache Software Foundation

Description

Apache Traffic Server mishandles PROXY protocol input, truncating ports and overflowing the stack. 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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-29

Last Modified

2026-08-03

Generated

2026-08-19

AI Q&A

2026-07-30

EPSS Evaluated

2026-08-18

NVD

CVE-2026-58158

Affected Vendors & Products

Vendor	Product	Version / Range
apache	traffic_server	From 10.0.0 (inc) to 10.1.4 (exc)
apache	traffic_server	From 8.0.0 (inc) to 8.1.9 (inc)
apache	traffic_server	From 9.0.0 (inc) to 9.2.15 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

Apache Traffic Server has a flaw where it mishandles PROXY protocol input. This causes it to truncate ports and overflow the stack, potentially leading to crashes or unexpected behavior.

Detection Guidance

Detecting this vulnerability requires checking the Apache Traffic Server version in use. Run: apache-trafficserver -v or check package managers like apt list --installed | grep trafficserver or yum list installed | grep trafficserver. If the version is between 8.0.0-8.1.9, 9.0.0-9.2.14, or 10.0.0-10.1.3, the system is vulnerable.

Impact Analysis

This vulnerability could allow attackers to cause denial-of-service conditions or execute arbitrary code by sending maliciously crafted PROXY protocol data. Systems running affected versions are at risk.

Compliance Impact

The vulnerability involves stack overflow due to improper handling of PROXY protocol input in Apache Traffic Server. This could potentially lead to denial of service or arbitrary code execution, which may impact data availability and integrity. However, the provided CVE data does not specify direct implications for GDPR or HIPAA compliance.

Mitigation Strategies

Upgrade Apache Traffic Server to version 9.2.15 or 10.1.4 immediately. Follow standard upgrade procedures for your distribution. If upgrading is not possible, consider disabling PROXY protocol support temporarily until the update is applied.

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