Vulnerability details
CVE-2025-31699
Apache Traffic Server: Origin connection still owed a request body is reused, enabling request smuggling
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 4.0 | CVEProject cvelistV5 (CNA) (apache) | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:L/SC:H/SI:H/SA:L |
| 8.9High | 3.1 | CVEProject cvelistV5 (CNA) (apache) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server | 10.2.0 | CVEProject cvelistV5 (CNA) |
| Apache Software Foundation | Apache Traffic Server | 10.0.0 ≤ v ≤ 10.1.4 | CVEProject cvelistV5 (CNA) |
| Apache Software Foundation | Apache Traffic Server | 8.0.0 ≤ v ≤ 8.1.11 | CVEProject cvelistV5 (CNA) |
| Apache Software Foundation | Apache Traffic Server | 9.0.0 ≤ v ≤ 9.2.15 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc vendor-advisory
Details
- Published
- 2026-10-21
- Last updated
- 2026-10-23
- State
- Published
- Assigner (CNA)
- apache
- Kolun priority
- 21 · Low
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-444Inconsistent Interpretation of HTTP Requests