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NVD / CVE Program· CNA openjs

CVE-2026-2581: undici is vulnerable to Unbounded Memory Consumption in in Undici's DeduplicationHandler via Response Buffering leads to DoS

Noroxi assessment

Priority: Monitor (action score 23/100)

  • 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: 0.63% (FIRST EPSS); higher than 50.4% 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. Special conditions such as timing or configuration are required.
  • Fixed version: nodejs24-docs (AlmaLinux:10) 1:24.14.1-2.el10_1; nodejs24-npm (AlmaLinux:10) 1:11.11.0-1.24.14.1.2.el10_1; nodejs (AlmaLinux:8) 1:24.14.1-2.module_el8.10.0+4160+4819ac42.

Low priority for now. Upgrade to nodejs24-docs (AlmaLinux:10) 1:24.14.1-2.el10_1; nodejs24-npm (AlmaLinux:10) 1:11.11.0-1.24.14.1.2.el10_1; nodejs (AlmaLinux:8) 1:24.14.1-2.module_el8.10.0+4160+4819ac42 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

This is an uncontrolled resource consumption vulnerability (CWE-400) that can lead to Denial of Service (DoS). In vulnerable Undici versions, when interceptors.deduplicate() is enabled, response data for deduplicated requests could be accumulated in memory for downstream handlers. An attacker-controlled or untrusted upstream endpoint can exploit this with large/chunked responses and concurrent identical requests, causing high memory usage and potential OOM process termination. Impacted users are applications that use Undici’s deduplication interceptor against endpoints that may produce large or long-lived response bodies. PatchesThe issue has been patched by changing deduplication behavior to stream response chunks to downstream handlers as they arrive (instead of full-body accumulation), and by preventing late deduplication when body streaming has already started. Users should upgrade to the first official Undici (and Node.js, where applicable) releases that include this patch.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Mar 12, 2026
Updated
Jun 17, 2026
EPSS
0.6% · 50th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · openjs
5.9
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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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.

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Affected 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.

VendorProduct
nodejsundici

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • nodejs undici7.17.0 and later · before 7.24.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (openjs). Independent of NVD's CPE analysis and usually ahead of it.

  • undici undici

    • 6.24.0: 7.24.0not affected
    • < 6.24.0; 7.0.0 < 7.24.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10nodejs24-docsbefore 1:24.14.1-2.el10_11:24.14.1-2.el10_1
AlmaLinux:10nodejs24-npmbefore 1:11.11.0-1.24.14.1.2.el10_11:11.11.0-1.24.14.1.2.el10_1
AlmaLinux:8nodejsbefore 1:24.14.1-2.module_el8.10.0+4160+4819ac421:24.14.1-2.module_el8.10.0+4160+4819ac42
AlmaLinux:8nodejs-develbefore 1:24.14.1-2.module_el8.10.0+4160+4819ac421:24.14.1-2.module_el8.10.0+4160+4819ac42
AlmaLinux:8nodejs-docsbefore 1:24.14.1-2.module_el8.10.0+4160+4819ac421:24.14.1-2.module_el8.10.0+4160+4819ac42
AlmaLinux:8nodejs-full-i18nbefore 1:24.14.1-2.module_el8.10.0+4160+4819ac421:24.14.1-2.module_el8.10.0+4160+4819ac42
AlmaLinux:8nodejs-libsbefore 1:24.14.1-2.module_el8.10.0+4160+4819ac421:24.14.1-2.module_el8.10.0+4160+4819ac42
AlmaLinux:8nodejs-nodemonbefore 3.0.3-1.module_el8.10.0+4061+f8ceeab93.0.3-1.module_el8.10.0+4061+f8ceeab9
AlmaLinux:8nodejs-packagingbefore 2021.06-6.module_el8.10.0+4086+70facd4a2021.06-6.module_el8.10.0+4086+70facd4a
AlmaLinux:8nodejs-packaging-bundlerbefore 2021.06-6.module_el8.10.0+4086+70facd4a2021.06-6.module_el8.10.0+4086+70facd4a
AlmaLinux:8npmbefore 1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac421:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42
AlmaLinux:8v8-13.6-develbefore 3:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac423:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac42
AlmaLinux:9nodejsbefore 1:24.14.1-2.module_el9.7.0+222+ef1c61e11:24.14.1-2.module_el9.7.0+222+ef1c61e1
AlmaLinux:9nodejs-develbefore 1:24.14.1-2.module_el9.7.0+222+ef1c61e11:24.14.1-2.module_el9.7.0+222+ef1c61e1
AlmaLinux:9nodejs-docsbefore 1:24.14.1-2.module_el9.7.0+222+ef1c61e11:24.14.1-2.module_el9.7.0+222+ef1c61e1
AlmaLinux:9nodejs-full-i18nbefore 1:24.14.1-2.module_el9.7.0+222+ef1c61e11:24.14.1-2.module_el9.7.0+222+ef1c61e1
AlmaLinux:9nodejs-libsbefore 1:24.14.1-2.module_el9.7.0+222+ef1c61e11:24.14.1-2.module_el9.7.0+222+ef1c61e1
AlmaLinux:9nodejs-nodemonbefore 3.0.3-3.module_el9.7.0+209+ecf6523e3.0.3-3.module_el9.7.0+209+ecf6523e
AlmaLinux:9nodejs-packagingbefore 2021.06-6.module_el9.7.0+209+ecf6523e2021.06-6.module_el9.7.0+209+ecf6523e
AlmaLinux:9nodejs-packaging-bundlerbefore 2021.06-6.module_el9.7.0+198+8bf605ba2021.06-6.module_el9.7.0+198+8bf605ba
AlmaLinux:9npmbefore 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e11:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
AlmaLinux:9v8-13.6-develbefore 3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e13:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
Debian:13node-undicifrom 0—
Debian:14node-undicibefore 7.24.5+dfsg+~cs3.2.0-17.24.5+dfsg+~cs3.2.0-1

+45

Same product

nodejs: all records

Other 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 redirects
    36Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-1528Mar 12, 2026 · undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client
    30Monitor
  • ← EarlierCVE-2026-2229Mar 12, 2026 · undici is vulnerable to Unhandled Exception in undici WebSocket Client Due to Invalid server_max_window_bits Validation
    30Monitor
  • Later →CVE-2026-12151Jun 17, 2026 · undici WebSocket client vulnerable to denial of service via fragment count bypass
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:nodejs1:24.14.1-2.module_el9.7.0+222+ef1c61e1 · AlmaLinux:9Package registry (OSV)
almalinux:nodejs-devel1:24.14.1-2.module_el9.7.0+222+ef1c61e1 · AlmaLinux:9Package registry (OSV)
almalinux:nodejs-docs1:24.14.1-2.module_el9.7.0+222+ef1c61e1 · AlmaLinux:9Package registry (OSV)
almalinux:nodejs-full-i18n1:24.14.1-2.module_el9.7.0+222+ef1c61e1 · AlmaLinux:9Package registry (OSV)
almalinux:nodejs-libs1:24.14.1-2.module_el9.7.0+222+ef1c61e1 · AlmaLinux:9Package registry (OSV)
almalinux:nodejs-nodemon3.0.3-3.module_el9.7.0+209+ecf6523e · AlmaLinux:9Package registry (OSV)
almalinux:nodejs-packaging2021.06-6.module_el9.7.0+209+ecf6523e · AlmaLinux:9Package registry (OSV)
almalinux:nodejs-packaging-bundler2021.06-6.module_el9.7.0+198+8bf605ba · AlmaLinux:9Package registry (OSV)
almalinux:nodejs24-docs1:24.14.1-2.el10_1 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-npm1:11.11.0-1.24.14.1.2.el10_1 · AlmaLinux:10Package registry (OSV)
almalinux:npm1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 · AlmaLinux:9Package registry (OSV)
almalinux:v8-13.6-devel3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 · AlmaLinux:9Package registry (OSV)
debian:node-undici7.24.5+dfsg+~cs3.2.0-1 · Debian:14Package registry (OSV)
npm:undici7.24.0Package registry (OSV)
opensuse:nodejs2424.17.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:nodejs1:24.14.1-2.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:nodejs-debuginfo1:24.14.1-2.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:nodejs-debugsource1:24.14.1-2.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:nodejs-devel1:24.14.1-2.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:nodejs-docs1:24.14.1-2.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:nodejs-full-i18n1:24.14.1-2.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:nodejs-libs1:24.14.1-2.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:nodejs-libs-debuginfo1:24.14.1-2.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:nodejs-nodemon0:3.0.3-3.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:nodejs-packaging0:2021.06-6.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:nodejs-packaging-bundler0:2021.06-6.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:npm1:11.11.0-1.24.14.1.2.module+el9.7.0+24166+51c9666b · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
rocky linux:nodejs-nodemon0:3.0.3-3.module+el9.7.0+40025+0e0cf6b2 · Rocky Linux:9Package registry (OSV)
rocky linux:nodejs-packaging0:2021.06-6.module+el9.7.0+40052+e32ea525 · Rocky Linux:9Package registry (OSV)
rocky linux:nodejs241:24.14.1-2.el10_1 · Rocky Linux:10Package registry (OSV)

+1

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.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-2203657 days apartUndici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion
    30Monitor
  • CVE-2026-109924217 days apartundici vulnerable to Denial of Service via unbounded memory in the EventSource parser
    30Monitor
  • CVE-2026-84890176 days apartundici vulnerable to Denial of Service via unbounded decompression of compressed responses
    23Monitor

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.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
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 Throttling

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records