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Priority review Notice Added Final

Apache Traffic Server vulnerabilities allow DoS, request smuggling

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Summary

CERT-Bund published security advisory WID-SEC-2026-0978 disclosing multiple vulnerabilities (CVSS Base Score 7.5, CVSS Temporal Score 6.5) in Apache Traffic Server. The vulnerabilities affect versions prior to 9.1.13 and 10.1.2 running on Linux and UNIX systems, including Debian Linux and Fedora Linux. Remote attackers can exploit these vulnerabilities to conduct Denial of Service or HTTP Request Smuggling attacks. Mitigations are available.

What changed

CERT-Bund disclosed multiple security vulnerabilities in Apache Traffic Server, a widely-used HTTP/1.1 compatible caching proxy server. The vulnerabilities carry a CVSS Base Score of 7.5 (high) and allow remote attackers to perform Denial of Service attacks or HTTP Request Smuggling attacks against affected deployments.\n\nOrganizations running Apache Traffic Server on Linux or UNIX systems should immediately audit their deployments, identify affected versions (prior to 9.1.13 or 10.1.2), and apply available patches or mitigations. Unpatched proxy servers could be exploited to disrupt services or manipulate HTTP request handling, potentially affecting downstream systems and users relying on the proxy infrastructure.

What to do next

  1. Identify all Apache Traffic Server deployments in your infrastructure
  2. Apply patches to upgrade to version 9.1.13 or 10.1.2 or later
  3. Review proxy configurations for potential request smuggling mitigations

Archived snapshot

Apr 7, 2026

GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.

[WID-SEC-2026-0978] Apache Traffic Server: Mehrere Schwachstellen CVSS Base Score 7.5 (hoch) CVSS Temporal Score 6.5 (mittel) Remoteangriff ja Datum 06.04.2026 Stand 07.04.2026 Mitigation ja

Betroffene Systeme

Betriebssystem

  • Linux
  • UNIX

Produktbeschreibung

Apache Traffic Server ist ein skalier- und erweiterbarer, mit HTTP/1.1 kompatibler "caching proxy server".

Produkte

06.04.2026
- Debian Linux

  • Fedora Linux

  • Apache Traffic Server <9.1.13

  • Apache Traffic Server <10.1.2

Angriff

Angriff

Ein entfernter Angreifer kann mehrere Schwachstellen in Apache Traffic Server ausnutzen, um einen Denial of Service- oder Request-Smuggling-Angriff durchzuführen. CVE Informationen Versionshistorie Feedback zum Advisory geben

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Last updated

Classification

Agency
CERT-Bund
Published
April 6th, 2026
Instrument
Notice
Legal weight
Non-binding
Stage
Final
Change scope
Substantive
Document ID
WID-SEC-2026-0978

Who this affects

Applies to
Technology companies Government agencies Organizations operating proxy servers
Industry sector
5112 Software & Technology
Activity scope
Proxy server administration Server patch management Vulnerability remediation
Geographic scope
Germany DE

Taxonomy

Primary area
Cybersecurity
Operational domain
IT Security
Compliance frameworks
NIST CSF
Topics
Data Privacy Software & Technology

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