CVE-2026-58153

Analyzed Analyzed - Analysis Complete

HTTP/2 to HTTP/1 Trailer Handling Flaw in Apache Traffic Server

Publication date: 2026-07-29

Last updated on: 2026-08-03

Assigner: Apache Software Foundation

Description

Apache Traffic Server forwards HTTP/2 origin trailers to HTTP/1 clients without proper chunked framing when converting HTTP/2 to HTTP/1. This issue affects Apache Traffic Server: 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

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Meta Information

Published

2026-07-29

Last Modified

2026-08-03

Generated

2026-08-18

AI Q&A

2026-07-30

EPSS Evaluated

2026-08-17

NVD

CVE-2026-58153

EUVD

EUVD-2026-50205

Affected Vendors & Products

Vendor	Product	Version / Range
apache	traffic_server	From 10.0.0 (inc) to 10.1.4 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-444	The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

Attack-Flow Graph

Executive Summary

Apache Traffic Server improperly forwards HTTP/2 origin trailers to HTTP/1 clients during protocol conversion. This occurs without proper chunked framing, which is required for correct HTTP/1 message formatting.

Detection Guidance

This vulnerability involves HTTP/2 to HTTP/1 conversion issues in Apache Traffic Server. Detection requires checking for improper handling of HTTP/2 origin trailers when converted to HTTP/1. Monitor logs for malformed requests or responses, especially those involving chunked framing. Ensure your Apache Traffic Server version is not between 10.0.0 and 10.1.3.

Impact Analysis

This flaw may cause HTTP/1 clients to misinterpret responses, leading to potential data corruption or processing errors. It affects Apache Traffic Server versions 10.0.0 through 10.1.3.

Compliance Impact

The vulnerability involves improper handling of HTTP/2 origin trailers when converting to HTTP/1, which could lead to data integrity issues during transmission. This may impact compliance with standards like GDPR or HIPAA if sensitive data is altered or exposed during processing. However, the provided CVE details do not explicitly link this issue to specific compliance violations.

Mitigation Strategies

Upgrade Apache Traffic Server to version 9.2.15 or 10.1.4 to fix the issue.

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