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  4. CVE 2026 111817 apache traffic server dropping chunked trailers
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Back to active CVEs
Medium · CVSS 6.9CVE-2026-111817

Apache Traffic Server: Dropping chunked trailers stalls a passthrough transfer until timeoutCVE-2026-111817

Answer in brief

CVE-2026-111817 records a Medium severity (CVSS 6.9) vulnerability in Apache Traffic Server: Dropping chunked trailers stalls a passthrough transfer until timeout. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache Traffic Server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 21, 2026Updated Oct 21, 2026Source checked Oct 21, 2026First seen by HOL Oct 21, 2026Material review Oct 21, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.9
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache Traffic Server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/Apache Traffic Servergeneric8.1.11 || >=9.2.5 <=9.2.15 || >=10.0.0 <=10.1.4 || 10.2.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache Traffic Server.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 21, 2026

Sources and claim methodology

  • Source referencelists.apache.org
Upstream source description

Apache Traffic Server can stall a chunked transfer that it passes through with its trailers removed (proxy.config.http.drop_chunked_trailers) until the connection times out, because it waits for the trailer bytes it has already dropped. Trailer dropping is on by default in 10.x. In 8.1.11 and 9.2.x it is off by default, and those versions are affected only if it is enabled. This issue affects Apache Traffic Server: 8.1.11, from 9.2.5 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0. Users are recommended to upgrade to version 10.1.5 or 10.2.1, which fix the issue.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Apache Traffic Server: Origin connection still owed a request body is reused, enabling request smugglingSame apache software foundation/apache traffic server package
  • Apache Traffic Server: An unread Expect: 100-continue request body is framed as a new requestSame apache software foundation/apache traffic server package
  • Apache Traffic Server: wasm plugin has a use-after-free and forwards unvalidated guest metric IDsSame apache software foundation/apache traffic server package
  • Apache Traffic Server: HTTP/2 Content-Length truncation lets a client trigger backend worker-pool exhaustionSame apache software foundation/apache traffic server package
  • Apache Traffic Server: HTTP/2 DATA frame padding underflow lets a client trigger backend worker-pool exhaustionSame apache software foundation/apache traffic server package
  • Apache Traffic Server: HEAD requests carrying Content-Length or Transfer-Encoding enable request smugglingSame apache software foundation/apache traffic server package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-400
Source
CVE List V5
Source checked
Oct 21, 2026
References
1 linked source
Open source record