Vulnerability details
CVE-2026-111816
Apache Software Foundation Apache Traffic Server
Apache Traffic Server: A malformed 302 response bypasses parse-error rejection through the Transfer-Encoding: chunked carve-out
CVSS 4.0
9.2Critical
Official description
Apache Traffic Server forwarded a malformed 302 response that should have been rejected as a parse error, because the Transfer-Encoding: chunked carve-out bypassed the rejection path. A response that two peers can read differently is then stored and served, allowing cache poisoning and response-framing desync. 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 |
|---|---|---|---|
| 9.2Critical | 4.0 | CVEProject cvelistV5 (CNA) (apache) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N |
| 9.3Critical | 3.1 | CVEProject cvelistV5 (CNA) (apache) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N |
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
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Details
- Published
- 2026-10-21
- Last updated
- 2026-10-24
- State
- Published
- Assigner (CNA)
- apache
- Kolun priority
- 20 · Low
Exploit prediction (EPSS)
0.3%
Probability of exploitation in 30 days
23.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-444Inconsistent Interpretation of HTTP Requests