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    CVE-2025-55702

    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.

    Published:Oct 21, 2026
    Last Modified:Oct 28, 2026
    EPS:Oct 21, 2026
    EPSS Score:0.00325
    CVSS Score:8.7

    Affected Products

    Vendor
    Apache
    Product
    Apache Traffic Server
    Vendor
    Apache
    Product
    Traffic Server
    Vendor
    Apache Software Foundation
    Product
    Apache Traffic Server

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    Related CVEs

    CVE-2026-112381 (CVSS 8.2) — Apache Traffic Server can crash with a null pointer dereference when a client POST request is torn down via ha…
    CVE-2026-111817 (CVSS 6.9) — Apache Traffic Server can stall a chunked transfer that it passes through with its trailers removed (proxy.con…
    CVE-2026-111812 (CVSS 7) — Apache Traffic Server's origin_server_auth plugin lets a client force signing of attacker-chosen AWS request h…
    CVE-2026-111811 (CVSS 9.4) — Apache Traffic Server's experimental tsmemcache plugin allows unauthenticated network read, write, and deletio…
    CVE-2026-111809 (CVSS 6.9) — Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encodin…
    CVE-2026-111810 (CVSS 8.7) — Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line for every internal @…
    CVE-2026-111815 (CVSS 7.8) — Apache Traffic Server can resume a TLS session across SNI virtual hosts without re-verifying a client certific…
    CVE-2026-111814 (CVSS 7.8) — Apache Traffic Server's default outbound session-sharing policy can reuse a pooled TLS session authenticated w…
    CVE-2026-111808 (CVSS 7.7) — Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a malformed padded HTTP/2 DA…
    CVE-2026-111805 (CVSS 7.7) — Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a truncated HTTP/2 Content-L…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High