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CVE-2026-33267 is an improper input validation vulnerability in Apache Traffic Server affecting versions 9.2.0 through 9.2.14 and 10.1.0 through 10.1.3. The flaw arises because Apache Traffic Server does not reliably strip client-supplied hop-by-hop headers named in the Connection header, or internal metadata headers prefixed with "@", from untrusted peers before plugin processing hooks are invoked. As a result, untrusted request data can be exposed to plugin logic as if it were trusted internal metadata, and malformed or smuggled header state can survive into later processing stages. The issue is associated with request and response header hook handling and internal header stripping logic, enabling request smuggling and metadata injection conditions.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Apache Traffic Server vulnerability involving improper handling of internal metadata headers beginning with '@', where client-supplied @ headers may be observed by plugins and internal @ headers are stripped from client requests.
An improper input validation vulnerability in Apache Traffic Server affecting versions 9.2.0 through 9.2.14 and 10.1.0 through 10.1.3.
A request smuggling and metadata injection vulnerability in Apache Traffic Server due to failure to strip hop-by-hop and internal headers from untrusted peers.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.