CVE-2026-111816
Critical
Description
Apache Traffic Server forwarded a malformed 302 response that should have been rejected as a parse error, because the Transfer-Encoding: chunked carve-out bypassed the rejection path. A response that two peers can read differently is then stored and served, allowing cache poisoning and response-framing desync. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 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.
SeverityCritical
CVSS9.3
Exploit probability—
Product
Apache Traffic Server
PublishedOct 21, 2026
First seenOct 21, 2026
Weakness typeCWE-444CWE-444
How to fix
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Apache Software Foundation Apache Traffic Server | 8.0.0 ≤ v ≤ 8.1.11, 9.0.0 ≤ v ≤ 9.2.15, 10.0.0 ≤ v ≤ 10.1.4, 10.2.0 | — |
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