CVE-2026-22036: Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion
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: 0.45% (FIRST EPSS).
- 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.
- Fixed version: nodejs undici 7.18.0.
Low priority for now. Upgrade to nodejs undici 7.18.0 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 7.18.0 and 6.23.0, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation. This vulnerability is fixed in 7.18.0 and 6.23.0.
- Published
- Jan 14, 2026
- Updated
- Jun 17, 2026
- EPSS
- 0.4% · 39th percentile
- CWE
- CWE-770
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 · 0.4%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.5
- CNA · GitHub_M
- 5.9
- 1.6 point gap
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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 6.23.0
- nodejs undici7.0.0 and later · before 7.18.2
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
- < 6.23.0, >= 7.0.0, < 7.18.2affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | node-undici | from 0 | — |
| Debian:14 | node-undici | before 7.18.2+dfsg+~cs3.2.0-1 | 7.18.2+dfsg+~cs3.2.0-1 |
| npm | undici | from 7.0.0 · before 7.18.2 | 7.18.2 |
| npm | undici | before 6.23.0 | 6.23.0 |
| openSUSE:Leap 15.6 | nodejs20 | before 20.20.0-150600.3.15.1 | 20.20.0-150600.3.15.1 |
| openSUSE:Leap 15.6 | nodejs22 | before 22.22.0-150600.13.12.1 | 22.22.0-150600.13.12.1 |
| openSUSE:Leap 16.0 | nodejs22 | before 22.22.0-160000.1.1 | 22.22.0-160000.1.1 |
| openSUSE:Tumbleweed | nodejs22 | before 22.22.0-1.1 | 22.22.0-1.1 |
| openSUSE:Tumbleweed | nodejs24 | before 24.13.0-2.1 | 24.13.0-2.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | nodejs16 | before 16.20.2-150400.3.42.1 | 16.20.2-150400.3.42.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | nodejs18 | before 18.20.8-150400.9.39.1 | 18.20.8-150400.9.39.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | nodejs20 | before 20.20.0-150500.11.24.1 | 20.20.0-150500.11.24.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | nodejs20 | before 20.20.2-150500.11.30.1 | 20.20.2-150500.11.30.1 |
| SUSE:Linux Enterprise Module for Web and Scripting 15 SP7 | nodejs22 | before 22.22.0-150700.3.6.1 | 22.22.0-150700.3.6.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | nodejs18 | before 18.20.8-8.44.1 | 18.20.8-8.44.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | nodejs20 | before 20.20.0-150600.3.15.1 | 20.20.0-150600.3.15.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | nodejs20 | before 20.20.2-150600.3.21.1 | 20.20.2-150600.3.21.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | nodejs22 | before 22.22.0-150600.13.12.1 | 22.22.0-150600.13.12.1 |
| SUSE:Linux Enterprise Server 16.0 | nodejs22 | before 22.22.0-160000.1.1 | 22.22.0-160000.1.1 |
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-2025-22150Jan 21, 2025 · Undici Uses Insufficiently Random Values27Monitor
- ← EarlierCVE-2025-47279May 15, 2025 · undici Denial of Service attack via bad certificate data12Monitor
- Later →CVE-2026-1526Mar 12, 2026 · undici is vulnerable to Unbounded Memory Consumption in undici WebSocket permessage-deflate Decompression30Monitor
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 |
|---|---|---|
| nodejs undici | 7.18.0 · description | Vendor (CNA) |
| debian:node-undici | 7.18.2+dfsg+~cs3.2.0-1 · Debian:14 | Package registry (OSV) |
| npm:undici | 6.23.0 | Package registry (OSV) |
| npm:undici | 7.18.2 | Package registry (OSV) |
| opensuse:nodejs20 | 20.20.0-150600.3.15.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:nodejs22 | 22.22.0-150600.13.12.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:nodejs24 | 24.13.0-2.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| suse:nodejs16 | 16.20.2-150400.3.42.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:nodejs18 | 18.20.8-8.44.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS | Package registry (OSV) |
| suse:nodejs20 | 20.20.0-150600.3.15.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:nodejs22 | 22.22.0-150600.13.12.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
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.
- CVE-2026-109924274 days apartundici vulnerable to Denial of Service via unbounded memory in the EventSource parser30Monitor
- CVE-2026-258157 days apartundici is vulnerable to Unbounded Memory Consumption in in Undici's DeduplicationHandler via Response Buffering leads to DoS23Monitor
- CVE-2026-84890233 days apartundici vulnerable to Denial of Service via unbounded decompression of compressed responses23Monitor
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-770 · Allocation of Resources Without Limits or ThrottlingCVSS 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)
- FloodingCAPEC-125likelihood: High · Medium
- Excessive AllocationCAPEC-130likelihood: Medium · Medium
- XML Ping of the DeathCAPEC-147likelihood: Low · Medium
- Exponential Data ExpansionCAPEC-197likelihood: High · Medium
- Serialized Data Parameter BlowupCAPEC-229likelihood: High · High
- Serialized Data with Nested PayloadsCAPEC-230likelihood: Medium · High
- Oversized Serialized Data PayloadsCAPEC-231likelihood: Medium · High
- HTTP DoSCAPEC-469Low
ATT&CK techniques
- Network Denial of Service:Direct Network FloodT1498.001
- Network Denial of Service:Reflection AmplificationT1498.002
- Endpoint Denial of ServiceT1499
- Endpoint Denial of Service: OS Exhaustion FloodT1499.001
- Endpoint Denial of Service:Service Exhaustion FloodT1499.002
- Endpoint Denial of Service:Application Exhaustion FloodT1499.003
Change log
- Fix✗ → ✓
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References
Show all references (1 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.