What is CVE-2025-22871?

CVE-2025-22871 is a critical-severity vulnerability in Go Standard Library Net/http/internal, classified under CWE-444: INCONSISTENT INTERPRETATION OF HTTP REQUESTS ('HTTP REQUEST SMUGGLING'). CVSS score: 9.1/10. Published 2025-04-08.

How severe is CVE-2025-22871?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2025-22871 known to be exploited?

10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Go Standard Library Net/http/internal

CVE-2025-22871

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…

EPSS: 0.007 (49.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Go Standard Library Net/http/internal — versions 0, 1.24.0-0

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-22871?: CVE-2025-22871 is a critical-severity vulnerability in Go Standard Library Net/http/internal, classified under CWE-444: INCONSISTENT INTERPRETATION OF HTTP REQUESTS ('HTTP REQUEST SMUGGLING'). CVSS score: 9.1/10. Published 2025-04-08.
How severe is CVE-2025-22871?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2025-22871 known to be exploited?: 10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.