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CVE-2026-58155

Apache Traffic Server: Header-name length truncation enables header aliasing and request smuggling

Apache Traffic Server truncates over-long header names, allowing header aliasing, request smuggling, and policy bypass. 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 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2026-58154

Apache Traffic Server: Memory-safety errors in MIME and header parsing

Apache Traffic Server can write out of bounds or overflow integers while parsing MIME and HTTP headers. 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 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2026-58152

Apache Traffic Server: Integer-handling errors in HPACK/XPACK decoding corrupt memory

Apache Traffic Server mishandles integers while decoding HPACK/XPACK headers, corrupting memory. 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 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2026-58151

Apache Traffic Server: Abusive HTTP/2 framing can exhaust resources and crash the server

Apache Traffic Server can be crashed or driven to resource exhaustion by abusive HTTP/2 framing and flow-control. 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 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2026-58150

Apache Traffic Server: HTTP/2 requests with Transfer-Encoding are not rejected, allowing request smuggling

Apache Traffic Server does not reject Transfer-Encoding in HTTP/2 requests, allowing downgrade request smuggling. 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 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2026-57834

Apache Traffic Server: Malformed chunked message body allows request smuggling

Apache Traffic Server allows request smuggling if chunked messages are malformed. 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
Traffic Server
CVE-2026-33930

Apache Traffic Server: Buffer overflow via Host field that has a long string value

Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is enabled. 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
Traffic Server
CVE-2023-44487

HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid Reset Attack)

The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.

CVSS 3.1 · 7.5 High EPSS 100.0% KEV · Listed
Vendors
Akka Amazon Apache and 30 more
Products
Http Server Opensearch Data Prepper Apisix and 375 more
CVE-2026-58177

Apache Traffic Server: Memory-safety and path-traversal errors in the Cripts framework

The Apache Traffic Server Cripts framework has out-of-bounds writes, path traversal, and use-after-free errors. This issue affects Apache Traffic Server: from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 10.1.4, which fix the issue.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2026-58153

Apache Traffic Server: HTTP/2 to HTTP/1 conversion forwards origin trailers to clients unsafely

Apache Traffic Server forwards HTTP/2 origin trailers to HTTP/1 clients without proper chunked framing when converting HTTP/2 to HTTP/1. This issue affects Apache Traffic Server: 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
Traffic Server
CVE-2026-41920

Apache Traffic Server: SNI to Host header matching policy is not properly enforced

Improper Access Control vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.0.0 through 9.1.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.1.15 or 10.1.4, which fixes the issue.

CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2026-22068

Apache Traffic Server: Regex mappings match with malicious domain names

Regular Expression without Anchors vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 10.0.X through 10.1.3, from 9.0.X through 9.2.14. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2026-33267

Apache Traffic Server: Untrusted @ headers can spoof ATS internal metadata

Improper Input Validation vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.2.0 through 9.2.14, from 10.1.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue.

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2026-24033

Apache Traffic Server: Request smuggling via chunked extension quoted-string parsing

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 10.0.0 through 10.1.3, from 9.0.0 through 9.2.14. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2026-65325

Apache Traffic Server: HTTP/2 multiplexed origin sessions are reused without certificate re-verification

Apache Traffic Server reuses multiplexed HTTP/2 origin connections without verifying the server certificate covers the new request hostname. This issue affects Apache Traffic Server: 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
Traffic Server
CVE-2025-58136

Apache Traffic Server: A simple legitimate POST request causes a crash

A bug in POST request handling causes a crash under a certain condition. This issue affects Apache Traffic Server: from 10.0.0 through 10.1.1, from 9.0.0 through 9.2.12. Users are recommended to upgrade to version 10.1.2 or 9.2.13, which fix the issue. A workaround for older versions is to set proxy.config.http.request_buffer_enabled to 0 (the default value is 0).

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
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
CVE-2025-65114

Apache Traffic Server: Malformed chunked message body allows request smuggling

Apache Traffic Server allows request smuggling if chunked messages are malformed.  This issue affects Apache Traffic Server: from 9.0.0 through 9.2.12, from 10.0.0 through 10.1.1. Users are recommended to upgrade to version 9.2.13 or 10.1.2, which fix the issue.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Traffic Server
CVE-2024-31309

Apache Traffic Server: HTTP/2 CONTINUATION frames can be utilized for DoS attack

HTTP/2 CONTINUATION DoS attack can cause Apache Traffic Server to consume more resources on the server.  Version from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.3 are affected. Users can set a new setting (proxy.config.http2.max_continuation_frames_per_minute) to limit the number of CONTINUATION frames per minute.  ATS does have a fixed amount of memory a request can use and ATS adheres to these limits in previous releases. Users are recommended to upgrade to versions 8.1.10 or 9.2.4 which fixes the issue.

CVSS 3.1 · 7.5 High EPSS 92.5% KEV · Not listed
Vendors
Apache Debian Fedoraproject
Products
Traffic Server Debian Linux Fedora
CVE-2024-35296

Apache Traffic Server: Invalid Accept-Encoding can force forwarding requests

Invalid Accept-Encoding header can cause Apache Traffic Server to fail cache lookup and force forwarding requests. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.10, from 9.0.0 through 9.2.4. Users are recommended to upgrade to version 8.1.11 or 9.2.5, which fixes the issue.

CVSS 3.1 · 8.2 High EPSS 1.1% KEV · Not listed
Vendors
Apache
Products
Traffic Server