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CVE-2026-111810

Apache Traffic Server: Unthrottled per-header diagnostic logging enables a log-flood denial of service

Apache Software Foundation Apache Traffic Server
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.26%Chance of exploitation activity in the next 30 days, higher than 17% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published21 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line for every internal @ header they strip, so a request carrying many such headers makes the proxy write far more log data than the request contains.

This issue affects Apache Traffic Server: 9.2.15, 10.1.4, 10.2.0.

Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.

Text from CVE List

Affected versions 3

  • Apache Traffic Serveraffected: 9.2.15CVE List
  • Apache Traffic Serveraffected: 10.1.4CVE List
  • Apache Traffic Serveraffected: 10.2.0CVE List

References 1