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CVE-2025-31699— Apache Traffic Server: Origin connection still owed a request body is reused, enabling request smuggling

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.

Apache Traffic Server 可能在源服务器仍在等待客户端声明但从未完整发送的请求体（包括客户端使用了 的情况）时，将源连接返回到共享连接池。随后，源服务器会将该连接上后续到达的请求误读为残留的请求体数据。这一缺陷使得攻击者能够绕过 ATS 的访问控制进行请求走私（request smuggling），干扰其他用户的请求，或污染缓存。 受影响的 Apache Traffic Server 版本包括： 8.0.0 至 8.1.11 9.0.0 至 9.2.15 10.0.0 至 10.1.4 10.2.

CVSS 8.9 · 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-2025-31699

Vulnerability Information
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Vulnerability Title
Apache Traffic Server: Origin connection still owed a request body is reused, enabling request smuggling
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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:L
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-2025-31699

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III. Intelligence Information for CVE-2025-31699

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Other References for CVE-2025-31699 (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-2025-55702 8.7 HIGH Apache Traffic Server: An unread Expect: 100-continue request body is framed as a new requ
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-2025-31699

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