Request smuggling due to acceptance of invalid chunked data in net/http
Summary
| CVE | CVE-2025-22871 |
|---|---|
| State | PUBLISHED |
| Assigner | Go |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-04-08 20:15:20 UTC |
| Updated | 2026-05-12 13:16:39 UTC |
| Description | The net/http package improperly accepts a bare LF as a line terminator in chunked data chunk-size lines. This can permit request smuggling if a net/http server is used in conjunction with a server that incorrectly accepts a bare LF as part of a chunk-ext. |
Risk And Classification
Primary CVSS: v3.1 9.1 CRITICAL from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS: 0.003420000 probability, percentile 0.568870000 (date 2026-05-12)
Problem Types: CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | DECLARED | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Go Standard Library | Net/http/internal | affected 1.23.8 semver | Not specified |
| CNA | Go Standard Library | Net/http/internal | affected 1.24.0-0 1.24.2 semver | Not specified |
| ADP | Siemens | SENTRON 7KT PAC1261 Data Manager | affected V2.1.0 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| go.dev/issue/71988 | [email protected] | go.dev | |
| cert-portal.siemens.com/productcert/html/ssa-783943.html | 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e | cert-portal.siemens.com | |
| pkg.go.dev/vuln/GO-2025-3563 | [email protected] | pkg.go.dev | |
| groups.google.com/g/golang-announce/c/Y2uBTVKjBQk | [email protected] | groups.google.com | |
| go.dev/cl/652998 | [email protected] | go.dev | |
| www.openwall.com/lists/oss-security/2025/04/04/4 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Jeppe Bonde Weikop (en)
There are currently no legacy QID mappings associated with this CVE.