High exploit reference

CVE-2023-30589 — The llhttp parser in the http module in Node v20.2.0 does not strictly use the CRLF…

The llhttp parser in the http module in Node v20.2.0 does not strictly use the CRLF sequence to delimit HTTP requests. This can lead to HTTP Request Smuggling (HRS). The CR character (without LF) is sufficient to delimit HTTP header fields in the llhttp parser. According to RFC7230 section 3, only the CRLF sequence should delimit each header-field. This impacts all Node.js active versions: v16, v18, and, v20

Published Jun 30, 2023 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: hackerone

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 3.9% (30-day exploitation probability)+14
Technical severity (high)+6
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

3.91%

ahead of 90% of scored CVEs · Oct 14, 2026

Affects

Fedoraproject

Fedora and 2 more

CVSS base

7.5

High · 1 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — lists.fedoraproject.org (NIST National Vulnerability Database)
Documented patch — lists.fedoraproject.org (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Fedoraproject Fedora, Nodejs Node, Nodejs Node.js).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the fixed version or the patch documented under Remediation.
EPSS ahead of 90% of scored CVEs: prioritize it in the patch queue.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Fedoraproject	Fedora	version 38version 37	Vulnerable	NIST National Vulnerability Database
Nodejs	Node	≥ 20.0 and < 20.3.1≥ 19.0 and < 19.≥ 18.0 and < 18.16.1≥ 17.0 and < 17.≥ 16.0 and < 16.20.1≥ 15.0 and < 15.≥ 14.0 and < 14.≥ 13.0 and < 13.* and 9 more ≥ 12.0 and < 12.≥ 11.0 and < 11.≥ 10.0 and < 10.≥ 9.0 and < 9.≥ 8.0 and < 8.≥ 7.0 and < 7.≥ 6.0 and < 6.≥ 5.0 and < 5.≥ 4.0 and < 4.*	Vulnerable	CVE Program (cve.org) e CISA ADP
Nodejs	Node.js	≥ 20.0.0 and < 20.3.1≥ 18.0.0 and < 18.16.1≥ 16.0.0 and < 16.20.1	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.5	CVSS 3.1	High	3.9	3.6	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N (score shown at the top: nvd@nist.gov)

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 3.91%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Affected products added · nodejs/node
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
Fix documented
Oct 13, 2026 · NIST National Vulnerability Database
CVSS changed · 7.5
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Modified
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
2023
CVE published
Jun 30, 2023 · hackerone

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

10 on the record

lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IV326O
Patch, Third Party Advisory, NIST National Vulnerability Database
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VCVG4T
Patch, Third Party Advisory, NIST National Vulnerability Database
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HMEELC
Mailing List, NIST National Vulnerability Database
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UEJWL6
Mailing List, NIST National Vulnerability Database
lists.debian.org/debian-lts-announce/2024/09/msg00029.html
NIST National Vulnerability Database
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VEEQIN
Mailing List, NIST National Vulnerability Database
security.netapp.com/advisory/ntap-20230803-0009/
Third Party Advisory, NIST National Vulnerability Database
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VKFMKD
Mailing List, NIST National Vulnerability Database
security.netapp.com/advisory/ntap-20240621-0006/
NIST National Vulnerability Database
hackerone.com/reports/2001873
Exploit, Issue Tracking, Third Party Advisory, NIST National Vulnerability Database

Elsewhere on this site

Fedoraproject
every CVE for this vendor

Related CVEs (same products)

Low CVE-2026-48932 HTTP Request Smuggling in Nodejs Node Sep 1, 2026
High CVE-2026-56848 Use After Free in Nodejs Node Aug 4, 2026
Medium CVE-2026-58045 Uncontrolled Resource Consumption in Nodejs Node Aug 3, 2026
Low CVE-2026-58044 HTTP Request Smuggling in Nodejs Node Aug 3, 2026
Medium CVE-2026-58042 Uncontrolled Resource Consumption in Nodejs Node Aug 3, 2026
Medium CVE-2026-58041 TOCTOU Race Condition in Nodejs Node Aug 3, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2023-30589 is "The llhttp parser in the http module in Node v20.2.0 does not strictly use the CRLF…", rated High. It affects Fedora (Fedoraproject); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. EPSS 3.91% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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