CVE-2025-22871 | Request smuggling due to acceptance of invalid chunked data in net/http

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.

Published: 2025-04-08 Last update: 2026-05-12 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-22871 is rated Moderate Risk (56.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.34%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-22871

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-10 0.13% 0.34% +0.21%
2 2026-04-01 0.17% 0.13% -0.04%
3 2026-03-10 — 0.17% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-22871

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 5.2 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-22871

GitHub Security Advisory for CVE-2025-22871

GHSA-g9pc-8g42-g6vq · Severity: critical · Ecosystem: composer — RoadRunner is at risk of HTTP Request/Response Smuggling through vulnerable dependency

OS Trackers for CVE-2025-22871

vendor priority summary link
alpine — CVE-2025-22871: 1 source package rows (go); 3 state rows across 3 repos (3.21-community, 3.22-community, edge-community); fixed 3, open 0. https://security.alpinelinux.org/vuln/CVE-2025-22871
debian not yet assigned CVE-2025-22871 not yet assigned priority: Debian including 3 source packages (golang-1.15, golang-1.19, golang-1.24), 3 status rows across 3 suites (bookworm, bullseye, trixie): open 2, resolved 1. https://security-tracker.debian.org/tracker/CVE-2025-22871
redhat medium — https://access.redhat.com/security/cve/CVE-2025-22871
suse medium CVE-2025-22871 severity moderate: SUSE including 203 source package names (1.23.10-2.7.6:go1.23-1.23.8-150000.1.27.1, 1.23.10-2.7.6:go1.23-doc-1.23.8-150000.1.27.1, …), 616 product×package rows across 55 product lines (Container bci/golang, Container suse/sl-micro/6.0/baremetal-os-container, … (55 product lines)): Fixed 317, Known Not Affected 299. https://www.suse.com/security/cve/CVE-2025-22871/
ubuntu medium CVE-2025-22871 medium priority: Ubuntu including 2 source packages (golang-1.23, golang-1.24), 14 status rows across 7 suites (focal, jammy, noble, oracular, plucky, questing, upstream): needs-triage 4, not-affected 4, DNE 3, released 2, ignored 1. https://ubuntu.com/security/CVE-2025-22871

Affected software / configurations for CVE-2025-22871

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2025-22871

cvelogic Threat Intelligence