Medium 6.5Published Nov 3, 2021

CVE-2021-22960The parse function in llhttp < 2.1.4 and < 6.0.6.

Updated under an hour ago (Nov 2, 2026, 1:40 AM ET)

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It affects llhttp and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Start free and add your stackFree account, 3 products Every CVE for llhttp Exploited in the last 30 days

The parse function in llhttp < 2.1.4 and < 6.0.6. ignores chunk extensions when parsing the body of chunked requests. This leads to HTTP Request Smuggling (HRS) under certain conditions.

CVSS: 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-444
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

llhttp llhttp llhttp:llhttp	before 2.1.4; from 3.0.0 before 6.0.6	NVD
oracle graalvm oracle:graalvm	20.3.4; 21.3.0	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://hackerone.com/reports/1238099	exploit, issue-tracking, third-party-advisory
https://www.debian.org/security/2022/dsa-5170	third-party-advisory
https://www.oracle.com/security-alerts/cpujan2022.html	patch, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.