CVE-2025-31699High· 8.9▾ TwilightApache Traffic Server can return an origin connection to the shared pool while the origin is still waiting on a request body the client declared but never fully sent, including when the client used Expect: 100-continue. The origin then r…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 49 · likelihood 0 · exploitation 0
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Apache Traffic Server can return an origin connection to the shared pool while the origin is still waiting on a request body the client declared but never fully sent, including when the client used Expect: 100-continue. The origin then reads a later request on that connection as leftover body data, which lets an attacker smuggle requests past ATS access controls, disrupt other users' requests, or poison the cache.
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.
apache_traffic_server >= 8.0.0 <= 8.1.11apache_traffic_server >= 9.0.0 <= 9.2.15apache_traffic_server >= 10.0.0 <= 10.1.4apache_traffic_server 10.2.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-111809Critical· 9.3Apache Traffic Server: HEAD requests carrying Content-Length or Transfer-Encoding enable request smuggling
CVE-2025-55702High· 8.7Apache Traffic Server: An unread Expect: 100-continue request body is framed as a new request
CVE-2026-111816Critical· 9.3Apache Traffic Server: A malformed 302 response bypasses parse-error rejection through the Transfer-Encoding: chunked carve-out
CVE-2026-111805High· 8.6Apache Traffic Server: HTTP/2 Content-Length truncation lets a client trigger backend worker-pool exhaustion
CVE-2026-111815Critical· 10.0Apache Traffic Server: TLS session ticket resumption bypasses per-SNI verify_client STRICT enforcement
CVE-2026-111808High· 8.6Apache Traffic Server: HTTP/2 DATA frame padding underflow lets a client trigger backend worker-pool exhaustion