High severity · published Oct 21, 2026
CVE-2026-111810
Apache Traffic Server: Unthrottled per-header diagnostic logging enables a log-flood denial of service
New
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AT
Apache Traffic Server · Apache Software Foundation
9.2.15; 10.1.4; 10.2.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111810
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111810
lists.apache.org
https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc
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