Vulnerability · Published Oct 21, 2026 · Assigned by apache
CVE-2025-31699Apache Traffic Server: Origin connection still owed a request body is reused, enabling request smuggling
High 8.9
In plain English
A high-severity security flaw in Apache Traffic Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | trafficserver | no fix listed | DEBIAN-CVE-2025-31699 |
| Ubuntu:24.04:LTS | trafficserver | no fix listed | UBUNTU-CVE-2025-31699 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Traffic Server | 8.0.0 – through 8.1.119.0.0 – through 9.2.1510.0.0 – through 10.1.410.2.0 |
Weakness: CWE-444 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
References
- https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc vendor-advisory