How severe is CVE-2022-35256?

CVE-2022-35256 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2022-35256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-35256?

CVE-2022-35256 primarily affects Nodejs Node.js. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-35256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2022-35256 published?

CVE-2022-35256 was published on 2022-12-05 and last updated on 2026-06-17.

CVE-2022-35256

CVE-2022-35256 is a medium-severity vulnerability in Nodejs Node.js with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-444.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-444
Affected product: Nodejs Node.js
Published: 2022-12-05
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2022-35256?: 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.
How severe is CVE-2022-35256?: CVE-2022-35256 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2022-35256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-35256?: CVE-2022-35256 primarily affects Nodejs Node.js. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-35256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2022-35256 published?: CVE-2022-35256 was published on 2022-12-05 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
cpe:2.3:a:llhttp:llhttp:*:*:*:*:*:node.js:*:*
cpe:2.3:a:siemens:sinec_ins:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:sinec_ins:1.0:-:*:*:*:*:*:*
cpe:2.3:a:siemens:sinec_ins:1.0:sp1:*:*:*:*:*:*
cpe:2.3:a:siemens:sinec_ins:1.0:sp2:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

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