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CVE-2025-55702— Apache Traffic Server: An unread Expect: 100-continue request body is framed as a new request

Quick assessment

Affected
Apache Software Foundation Apache Traffic Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

当客户端发送带有 请求头的 POST 请求，且源服务器在读取请求体之前即作出响应时，Apache Traffic Server 会将客户端连接上尚未读取的请求体部分解析为下一个请求。若攻击者位于前端代理之后，且该代理与 Traffic Server 共享连接，则可利用此漏洞将请求“走私”（smuggle）绕过前端代理，并导致其他用户的响应出现不同步。 此漏洞影响以下版本的 Apache Traffic Server： 8.0.0 至 8.1.11 9.0.0 至 9.2.15 10.0.0 至 10.1.4 10.

CVSS 8.7 · High

Affected Version Matrix 4

VendorProduct Version RangeStatus
Apache Software Foundation Apache Traffic Server 8.0.0≤ 8.1.11 affected
9.0.0≤ 9.2.15 affected
10.0.0≤ 10.1.4 affected
10.2.0 affected
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I. Basic Information for CVE-2025-55702

Vulnerability Information
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Vulnerability Title
Apache Traffic Server: An unread Expect: 100-continue request body is framed as a new request
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Traffic Server 8.0.0 ~ 8.1.11 -

II. Public POCs for CVE-2025-55702

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III. Intelligence Information for CVE-2025-55702

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Mailing List Discussions for CVE-2025-55702 (1)

Same Patch Batch · Apache Software Foundation · 2026-10-21 · 69 CVEs total

CVE-2026-105944 10.0 CRITICAL Apache Pulsar Manager: Missing authentication and authorization and disclosure of the Puls
CVE-2026-111812 10.0 CRITICAL Apache Traffic Server: origin_server_auth signs client-controlled AWS headers under the pr
CVE-2026-111813 10.0 CRITICAL Apache Traffic Server: magick plugin passes client query strings unfiltered to ImageMagick
CVE-2026-111815 10.0 CRITICAL Apache Traffic Server: TLS session ticket resumption bypasses per-SNI verify_client STRICT
CVE-2026-111814 10.0 CRITICAL Apache Traffic Server: Default server_session_sharing.match omits MASK_CERT, allowing pool
CVE-2026-111809 9.3 CRITICAL Apache Traffic Server: HEAD requests carrying Content-Length or Transfer-Encoding enable r
CVE-2026-111816 9.3 CRITICAL Apache Traffic Server: A malformed 302 response bypasses parse-error rejection through the
CVE-2026-105869 9.2 CRITICAL Apache Pulsar: MultiRolesTokenAuthorizationProvider uses roles from unverified tokens for
CVE-2026-111811 9.0 CRITICAL Apache Traffic Server: tsmemcache plugin exposes the shared proxy cache over the network w
CVE-2025-31699 8.9 HIGH Apache Traffic Server: Origin connection still owed a request body is reused, enabling req
CVE-2026-105937 8.7 HIGH Apache Pulsar: Missing authorization of the shadow topic source allows cross-tenant messag
CVE-2026-111808 8.6 HIGH Apache Traffic Server: HTTP/2 DATA frame padding underflow lets a client trigger backend w
CVE-2026-111805 8.6 HIGH Apache Traffic Server: HTTP/2 Content-Length truncation lets a client trigger backend work
CVE-2026-111804 8.2 HIGH Apache Traffic Server: wasm plugin has a use-after-free and forwards unvalidated guest met
CVE-2026-105945 7.7 HIGH Apache Pulsar: Improper Validation of Package Name Components Allows Cross-Tenant Package
CVE-2026-105942 7.7 HIGH Apache Pulsar: Original principal of proxied requests authorized with the proxy's authenti
CVE-2026-111810 7.5 HIGH Apache Traffic Server: Unthrottled per-header diagnostic logging enables a log-flood denia
CVE-2026-105934 7.2 HIGH Apache Pulsar: Missing tenant admin authorization check when truncating a partitioned topi
CVE-2026-105930 6.0 MEDIUM Apache Pulsar: Improper Authorization of Function, Source and Sink Package URLs Allows Cro
CVE-2026-112381 5.9 MEDIUM Apache Traffic Server: Nullptr dereference in net_write_io on a POST half-close with chunk

Showing top 20 of 69 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Apache Traffic Server
Same vendor: Apache Software Foundation
Same weakness: CWE-444

V. Comments for CVE-2025-55702

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