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CVE-2025-55702

Apache Traffic Server: An unread Expect: 100-continue request body is framed as a new request

When a client sends a POST with Expect: 100-continue and the origin answers before reading the body, Apache Traffic Server parses the unread body left on the client connection as the next request. An attacker behind a front-end proxy that shares connections to Traffic Server can use this to smuggle requests past the front end and desynchronize responses for other users. 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.

CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2025-31699

Apache Traffic Server: Origin connection still owed a request body is reused, enabling request smuggling

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.

CVSS 4.0 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111809

Apache Traffic Server: HEAD requests carrying Content-Length or Transfer-Encoding enable request smuggling

Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encoding. 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.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111811

Apache Traffic Server: tsmemcache plugin exposes the shared proxy cache over the network with no authentication

Apache Traffic Server's experimental tsmemcache plugin allows unauthenticated network read, write, and deletion of the shared proxy 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.

CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111816

Apache Traffic Server: A malformed 302 response bypasses parse-error rejection through the Transfer-Encoding: chunked carve-out

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.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111813

Apache Traffic Server: magick plugin passes client query strings unfiltered to ImageMagick convert in the default configuration

Apache Traffic Server's experimental magick plugin lets an unauthenticated client control ImageMagick convert arguments in its default (unsigned) configuration. This issue affects Apache Traffic Server: from 8.0.1 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.

CVSS 4.0 · 10 Critical EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-112381

Apache Traffic Server: Nullptr dereference in net_write_io on a POST half-close with chunked response

Apache Traffic Server can crash with a null pointer dereference when a client POST request is torn down via half-close while a chunked origin response is being reparsed from a reentrant write-ready callback, a timing-dependent race introduced by the CVE-2021-32564 flow-control backports. 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 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111817

Apache Traffic Server: Dropping chunked trailers stalls a passthrough transfer until timeout

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 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111810

Apache Traffic Server: Unthrottled per-header diagnostic logging enables a log-flood denial of service

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 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111808

Apache Traffic Server: HTTP/2 DATA frame padding underflow lets a client trigger backend worker-pool exhaustion

Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a malformed padded HTTP/2 DATA frame. 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.

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111805

Apache Traffic Server: HTTP/2 Content-Length truncation lets a client trigger backend worker-pool exhaustion

Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a truncated HTTP/2 Content-Length value. 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.

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111804

Apache Traffic Server: wasm plugin has a use-after-free and forwards unvalidated guest metric IDs

Apache Traffic Server's experimental wasm plugin has a use-after-free in its transaction-close handler and forwards unvalidated guest-supplied metric IDs to the internal stats API. This issue affects Apache Traffic Server: 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 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111815

Apache Traffic Server: TLS session ticket resumption bypasses per-SNI verify_client STRICT enforcement

Apache Traffic Server can resume a TLS session across SNI virtual hosts without re-verifying a client certificate required by the resumed host's verify_client STRICT policy. 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.

CVSS 4.0 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111814

Apache Traffic Server: Default server_session_sharing.match omits MASK_CERT, allowing pooled mTLS identity confusion at the origin

Apache Traffic Server's default outbound session-sharing policy can reuse a pooled TLS session authenticated with one client certificate for a transaction configured to present a different one. This issue affects Apache Traffic Server: 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.

CVSS 4.0 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-111812

Apache Traffic Server: origin_server_auth signs client-controlled AWS headers under the proxy's IAM credentials

Apache Traffic Server's origin_server_auth plugin lets a client force signing of attacker-chosen AWS request headers under the proxy's own credentials. 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.

CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Apache Traffic Server Traffic Server Apache Traffic Server
CVE-2026-58187

Apache Traffic Server: Multiplexer plugin chunk decoder enables a denial of service

The Apache Traffic Server multiplexer plugin overruns its chunk-decode buffer on upstream input, enabling denial of service. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Apache Traffic Server Traffic Server
CVE-2026-58178

Apache Traffic Server: ESI plugin allows uncontrolled recursion and server-side request forgery

The Apache Traffic Server ESI plugin can recurse without bound and fetch attacker-controlled URLs. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Apache Traffic Server Traffic Server
CVE-2026-58163

Apache Traffic Server: Cache deserialization and lifetime errors can corrupt state or crash the server

Apache Traffic Server mishandles on-disk cache fields and object lifetimes, corrupting state or crashing. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Apache Apache Software Foundation
Products
Traffic Server Apache Traffic Server
CVE-2026-58159

Apache Traffic Server: Listener and ACL handling allow access-control bypass

Apache Traffic Server can bypass IP access controls on UDS listeners and through ACL matching errors. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.

CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Apache Traffic Server Traffic Server
CVE-2026-59173

Apache Traffic Server: DoS vulnerability in HTTP/2 via stalled flow-control conditions

Uncontrolled Resource Consumption vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.0.0 through 9.1.13, from 10.0.0 through 10.1.2. Users are recommended to upgrade to version 9.1.14 or 10.1.3, which fixes the issue.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Apache Traffic Server Traffic Server