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Medium severity · published Oct 21, 2026
CVE-2026-111817
Apache Traffic Server: Dropping chunked trailers stalls a passthrough transfer until timeout
New
5.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
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
8.1.11; 9.2.5 through 9.2.15; 10.0.0 through 10.1.4; 10.2.0 · source: vendor
Affected product
AT
Apache Traffic Server
Apache Software Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111817
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111817
lists.apache.org
https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc
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