CVE-2023-24807: Undici vulnerable to Regular Expression Denial of Service in Headers
Noroxi assessment
Priority: Monitor (action score 30/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 1.3% (FIRST EPSS); higher than 70.9% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: nodejs (AlmaLinux:8) 1:18.14.2-2.module_el8.7.0+3497+c65299e7, 1:16.19.1-1.module_el8.7.0+3496+a59a3324; nodejs-devel (AlmaLinux:8) 1:16.19.1-1.module_el8.7.0+3496+a59a3324, 1:18.14.2-2.module_el8.7.0+3497+c65299e7; nodejs-docs (AlmaLinux:8) 1:18.14.2-2.module_el8.7.0+3497+c65299e7, 1:16.19.1-1.module_el8.7.0+3496+a59a3324.
Low priority for now. Upgrade to nodejs (AlmaLinux:8) 1:18.14.2-2.module_el8.7.0+3497+c65299e7, 1:16.19.1-1.module_el8.7.0+3496+a59a3324; nodejs-devel (AlmaLinux:8) 1:16.19.1-1.module_el8.7.0+3496+a59a3324, 1:18.14.2-2.module_el8.7.0+3497+c65299e7; nodejs-docs (AlmaLinux:8) 1:18.14.2-2.module_el8.7.0+3497+c65299e7, 1:16.19.1-1.module_el8.7.0+3496+a59a3324 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
Undici is an HTTP/1.1 client for Node.js. Prior to version 5.19.1, the `Headers.set()` and `Headers.append()` methods are vulnerable to Regular Expression Denial of Service (ReDoS) attacks when untrusted values are passed into the functions. This is due to the inefficient regular expression used to normalize the values in the `headerValueNormalize()` utility function. This vulnerability was patched in v5.19.1. No known workarounds are available.
- GHSA-r6ch-mqf9-qc9w
- ALSA-2023:1582
- ALSA-2023:1583
- ALSA-2023:2654
- ALSA-2023:2655
- openSUSE-SU-2024:12725-1
- openSUSE-SU-2024:12726-1
- RHSA-2023:1582
- RHSA-2023:1583
- RHSA-2023:2654
- RHSA-2023:2655
- RHSA-2023:5533
- RLSA-2023:1582
- RLSA-2023:1583
- RLSA-2023:2654
- RLSA-2023:2655
- SUSE-SU-2023:0608-1
- SUSE-SU-2023:0609-1
- SUSE-SU-2023:0673-1
- SUSE-SU-2023:0715-1
- Published
- Feb 16, 2023
- Updated
- Jun 17, 2026
- EPSS
- 1.3% · 70th percentile
- CWE
- CWE-20
Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.5
- CNA · GitHub_M
- 7.5
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| nodejs | undici | cpe:2.3:a:nodejs:undici |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- nodejs undicibefore 5.19.1
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
nodejs undici
- < 5.19.1affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | nodejs | before 1:18.14.2-2.module_el8.7.0+3497+c65299e7 | 1:18.14.2-2.module_el8.7.0+3497+c65299e7 |
| AlmaLinux:8 | nodejs | before 1:16.19.1-1.module_el8.7.0+3496+a59a3324 | 1:16.19.1-1.module_el8.7.0+3496+a59a3324 |
| AlmaLinux:8 | nodejs-devel | before 1:16.19.1-1.module_el8.7.0+3496+a59a3324 | 1:16.19.1-1.module_el8.7.0+3496+a59a3324 |
| AlmaLinux:8 | nodejs-devel | before 1:18.14.2-2.module_el8.7.0+3497+c65299e7 | 1:18.14.2-2.module_el8.7.0+3497+c65299e7 |
| AlmaLinux:8 | nodejs-docs | before 1:18.14.2-2.module_el8.7.0+3497+c65299e7 | 1:18.14.2-2.module_el8.7.0+3497+c65299e7 |
| AlmaLinux:8 | nodejs-docs | before 1:16.19.1-1.module_el8.7.0+3496+a59a3324 | 1:16.19.1-1.module_el8.7.0+3496+a59a3324 |
| AlmaLinux:8 | nodejs-full-i18n | before 1:16.19.1-1.module_el8.7.0+3496+a59a3324 | 1:16.19.1-1.module_el8.7.0+3496+a59a3324 |
| AlmaLinux:8 | nodejs-full-i18n | before 1:18.14.2-2.module_el8.7.0+3497+c65299e7 | 1:18.14.2-2.module_el8.7.0+3497+c65299e7 |
| AlmaLinux:8 | nodejs-nodemon | before 2.0.20-2.module_el8.7.0+3497+c65299e7 | 2.0.20-2.module_el8.7.0+3497+c65299e7 |
| AlmaLinux:8 | nodejs-nodemon | before 2.0.20-3.module_el8.7.0+3496+a59a3324 | 2.0.20-3.module_el8.7.0+3496+a59a3324 |
| AlmaLinux:8 | nodejs-packaging | before 25-1.module_el8.5.0+2605+45d748af | 25-1.module_el8.5.0+2605+45d748af |
| AlmaLinux:8 | nodejs-packaging | before 2021.06-4.module_el8.7.0+3343+ea2b7901 | 2021.06-4.module_el8.7.0+3343+ea2b7901 |
| AlmaLinux:8 | nodejs-packaging-bundler | before 2021.06-4.module_el8.7.0+3343+ea2b7901 | 2021.06-4.module_el8.7.0+3343+ea2b7901 |
| AlmaLinux:8 | npm | before 1:8.19.3-1.16.19.1.1.module_el8.7.0+3496+a59a3324 | 1:8.19.3-1.16.19.1.1.module_el8.7.0+3496+a59a3324 |
| AlmaLinux:8 | npm | before 1:9.5.0-1.18.14.2.2.module_el8.7.0+3497+c65299e7 | 1:9.5.0-1.18.14.2.2.module_el8.7.0+3497+c65299e7 |
| AlmaLinux:9 | nodejs | before 1:16.19.1-1.el9_2 | 1:16.19.1-1.el9_2 |
| AlmaLinux:9 | nodejs | before 1:18.14.2-2.module_el9.2.0+29+de583a0b | 1:18.14.2-2.module_el9.2.0+29+de583a0b |
| AlmaLinux:9 | nodejs-devel | before 1:18.14.2-2.module_el9.2.0+29+de583a0b | 1:18.14.2-2.module_el9.2.0+29+de583a0b |
| AlmaLinux:9 | nodejs-docs | before 1:18.14.2-2.module_el9.2.0+29+de583a0b | 1:18.14.2-2.module_el9.2.0+29+de583a0b |
| AlmaLinux:9 | nodejs-docs | before 1:16.19.1-1.el9_2 | 1:16.19.1-1.el9_2 |
| AlmaLinux:9 | nodejs-full-i18n | before 1:18.14.2-2.module_el9.2.0+29+de583a0b | 1:18.14.2-2.module_el9.2.0+29+de583a0b |
| AlmaLinux:9 | nodejs-full-i18n | before 1:16.19.1-1.el9_2 | 1:16.19.1-1.el9_2 |
| AlmaLinux:9 | nodejs-libs | before 1:16.19.1-1.el9_2 | 1:16.19.1-1.el9_2 |
| AlmaLinux:9 | nodejs-nodemon | before 2.0.20-2.module_el9.2.0+29+de583a0b | 2.0.20-2.module_el9.2.0+29+de583a0b |
+76
Same product
nodejs: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-35949`undici.request` vulnerable to SSRF using absolute URL on `pathname`40Plan
- CVE-2026-1525undici is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')39Monitor
- CVE-2026-109829undici vulnerable to cache poisoning and cross-user disclosure via cross-origin redirects36Monitor
Published before and after this one in the same product
- ← EarlierCVE-2022-31151Jul 21, 2022 · Uncleared cookies on cross-host/cross-origin redirect in undici26Monitor
- ← EarlierCVE-2022-35948Aug 15, 2022 · CRLF Injection in Nodejs ‘undici’ via Content-Type21Monitor
- Later →CVE-2023-45143Oct 12, 2023 · Undici's cookie header not cleared on cross-origin redirect in fetch14Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:nodejs | 1:16.19.1-1.module_el8.7.0+3496+a59a3324 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nodejs-devel | 1:16.19.1-1.module_el8.7.0+3496+a59a3324 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nodejs-docs | 1:16.19.1-1.module_el8.7.0+3496+a59a3324 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nodejs-full-i18n | 1:16.19.1-1.module_el8.7.0+3496+a59a3324 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nodejs-libs | 1:16.19.1-1.el9_2 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:nodejs-nodemon | 2.0.20-3.module_el8.7.0+3496+a59a3324 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nodejs-packaging | 25-1.module_el8.5.0+2605+45d748af · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nodejs-packaging-bundler | 2021.06-4.module_el8.7.0+3343+ea2b7901 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:npm | 1:8.19.3-1.16.19.1.1.module_el8.7.0+3496+a59a3324 · AlmaLinux:8 | Package registry (OSV) |
| alpine:nodejs | 16.19.1-r0 · Alpine:v3.15 | Package registry (OSV) |
| debian:node-undici | 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u1 · Debian:12 | Package registry (OSV) |
| npm:undici | 5.19.1 | Package registry (OSV) |
| opensuse:nodejs16 | 16.19.1-150400.3.15.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:nodejs18 | 18.14.2-150400.9.6.2 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:nodejs19 | 19.7.0-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:nodejs | 1:16.19.1-1.module+el8.7.0+18373+704f5cef · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-debuginfo | 1:16.19.1-1.module+el8.7.0+18373+704f5cef · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-debugsource | 1:16.19.1-1.module+el8.7.0+18373+704f5cef · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-devel | 1:16.19.1-1.module+el8.7.0+18373+704f5cef · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-docs | 1:16.19.1-1.module+el8.7.0+18373+704f5cef · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-full-i18n | 1:16.19.1-1.module+el8.7.0+18373+704f5cef · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-libs | 1:16.19.1-1.el9_2 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:nodejs-libs-debuginfo | 1:16.19.1-1.el9_2 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:nodejs-nodemon | 0:2.0.20-3.module+el8.7.0+18373+704f5cef · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-packaging | 0:25-1.module+el8.5.0+10992+fac5fe06 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-packaging-bundler | 0:2021.06-4.module+el8.7.0+15582+19c314fa · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:npm | 1:8.19.3-1.16.19.1.1.module+el8.7.0+18373+704f5cef · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| rocky linux:nodejs | 1:16.19.1-1.module+el8.7.0+1178+d52dba78 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:nodejs-nodemon | 0:2.0.20-3.module+el8.7.0+1178+d52dba78 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:nodejs-packaging | 0:25-1.module+el8.6.0+1046+80feca58 · Rocky Linux:8 | Package registry (OSV) |
+3
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (4 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.