CVE-2025-22871 — HTTP Request Smuggling in Standard Library NET Http Internal

CWE-444 — HTTP Request SmugglingCWE-1395 — Dependency on Vulnerable Third-Party Component13 documents7 sources
Severity
9.1CRITICALNVD
EPSS
0.1%
top 73.84%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
GO Standard Library NET Http InternalGithub.com Filebrowser Filebrowser V2Github.com Traefik Traefik V2+2 more
Timeline
PublishedApr 8
Latest updateNov 13

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NExploitability: 3.9 | Impact: 5.2

Affected Packages5 packages

▶CVEListV5go_standard_library/net_http_internal1.24.0-0 — 1.24.2+1
▶Packagistspiral/roadrunner< 2025.1.0
▶Gogithub.com/traefik_traefik_v33.4.0-rc1 — 3.4.0-rc2+1

🔴Vulnerability Details

9
OSV
File Browser has risk of HTTP Request/Response smuggling through vulnerable dependency↗2025-11-13
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GHSA
File Browser has risk of HTTP Request/Response smuggling through vulnerable dependency↗2025-11-13
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GHSA
Traefik affected by Go HTTP Request Smuggling Vulnerability↗2025-04-18
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OSV
Traefik affected by Go HTTP Request Smuggling Vulnerability↗2025-04-18
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OSV
CVE-2025-22871: The net/http package improperly accepts a bare LF as a line terminator in chunked data chunk-size lines↗2025-04-08
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📋Vendor Advisories

3
Microsoft
Request smuggling due to acceptance of invalid chunked data in net/http↗2025-04-08
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Red Hat
net/http: Request smuggling due to acceptance of invalid chunked data in net/http↗2025-04-08
▶
Debian
CVE-2025-22871: golang-1.15 - The net/http package improperly accepts a bare LF as a line terminator in chunke...↗2025
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CVE-2025-22871 — HTTP Request Smuggling | cvebase