CVE-2022-35256

Exp

The llhttp parser in the http module in Node v18.7.0 does not correctly handle header fields that are not terminated with CLRF. This may result in HTTP Request Smuggling.

Published: 2022-12-05 Last update: 2025-04-24 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-35256 is rated High Exploit Risk (72/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.69%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2022-35256

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2022-35256

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 2026-05-31 3.51% 3.69% +0.18%
2 2026-05-14 3.61% 3.51% -0.10%
3 2026-04-25 — 3.61% —

Full EPSS history (49 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-35256

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 2.5 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 2.5 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2022-35256

OS Trackers for CVE-2022-35256

vendor priority summary link
alpine — CVE-2022-35256: 2 source package rows (nodejs, nodejs-current); 67 state rows across 14 repos (3.17-community, 3.17-main, 3.18-community, 3.18-main, 3.19-community, 3.19-main, 3.20-community, 3.20-main, 3.21-community, 3.21-main, 3.22-community, 3.22-main, edge-community, edge-main); fixed 14, open 53. https://security.alpinelinux.org/vuln/CVE-2022-35256
debian unimportant CVE-2022-35256 unimportant priority: Debian including 2 source packages (llhttp, nodejs), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 7. https://security-tracker.debian.org/tracker/CVE-2022-35256
gentoo low CVE-2022-35256: 1 GLSA(s) (202405-29), 1 atom(s) (net-libs/nodejs); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-35256
redhat medium — https://access.redhat.com/security/cve/CVE-2022-35256
suse medium CVE-2022-35256 severity moderate: SUSE including 77 source package names (12-17.11:nodejs12-12.22.12-150200.4.38.1, 12-17.11:npm12-12.22.12-150200.4.38.1, …), 191 product×package rows across 15 product lines (Container bci/nodejs, SUSE Liberty Linux 8, … (15 product lines)): Fixed 191. https://www.suse.com/security/cve/CVE-2022-35256/
ubuntu medium CVE-2022-35256 medium priority: Ubuntu including 1 source packages (nodejs), 9 status rows across 9 suites (bionic, focal, jammy, kinetic, lunar, mantic, trusty, upstream, xenial): not-affected 6, released 2, ignored 1. https://ubuntu.com/security/CVE-2022-35256

Affected software / configurations for CVE-2022-35256

Vendor Product Version Raw CPE
nodejs node.js >= 14.0.0, <= 14.14.0 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 14.15.0, < 14.20.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 16.0.0, <= 16.12.0 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 16.13.0, < 16.17.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 18.0.0, < 18.9.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
llhttp llhttp < 6.0.10 cpe:2.3:a:llhttp:llhttp:*:*:*:*:*:node.js:*:*
siemens sinec_ins < 1.0 cpe:2.3:a:siemens:sinec_ins:*:*:*:*:*:*:*:*
siemens sinec_ins 1.0 cpe:2.3:a:siemens:sinec_ins:1.0:-:*:*:*:*:*:*
siemens sinec_ins 1.0 cpe:2.3:a:siemens:sinec_ins:1.0:sp1:*:*:*:*:*:*
siemens sinec_ins 1.0 cpe:2.3:a:siemens:sinec_ins:1.0:sp2:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References for CVE-2022-35256

URL Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-332410.pdf Third Party Advisory
https://hackerone.com/reports/1675191 Exploit Issue Tracking Third Party Advisory
https://www.debian.org/security/2023/dsa-5326 Third Party Advisory
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