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Noroxi
NVD / CVE Program· CNA openjs

CVE-2026-84947: undici vulnerable to response truncation via oversized chunked responses in the dump interceptor

Noroxi assessment

Priority: Monitor (action score 21/100)

  • 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: 0.19% (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: undici undici 7.29.1, 8.10.2.

Low priority for now. Upgrade to undici undici 7.29.1, 8.10.2 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's dump interceptor reads and discards a response body up to a configurable maximum size. When a response declares a Content-Length that exceeds the maximum, the interceptor aborts cleanly, but when a response has no Content-Length and is chunked, the interceptor instead signals completion early once the accumulated size reaches the maximum, without pausing or aborting the request. Because the underlying parser keeps delivering body bytes, a second completion signal fires and trips an internal assertion, which aborts the request and tears down the connection. The application is left observing a misleading successful status with an empty or truncated body while the connection has actually been disconnected. This affects undici versions from 7.1.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Sep 4, 2026
Updated
Sep 15, 2026
EPSS
0.1% · 9th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.3
CNA · openjs
3.7
1.6 point gap

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

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.

Follow CVE-2026-84947

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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 undici7.1.0 and later · before 7.29.1
  • nodejs undici8.0.0 and later · before 8.10.2

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

    • 7.29.1, 8.10.2not affected
    • 7.1.0 and later · before 7.29.1affected · semver
    • 8.0.0 and later · before 8.10.2affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12node-undicifrom 0—
Debian:14node-undicibefore 8.10.2+dfsg+~cs3.2.2-18.10.2+dfsg+~cs3.2.2-1
npmundicifrom 7.1.0 · before 7.29.17.29.1
npmundicifrom 8.0.0 · before 8.10.28.10.2
openSUSE:Leap 16.0pi-coding-agentbefore 1.0.4-bp160.1.11.0.4-bp160.1.1
openSUSE:Tumbleweedpi-coding-agentbefore 0.87.1-1.10.87.1-1.1
Red Hat:hummingbird:1grafana12.4before 0:12.4.10-0.2.hum10:12.4.10-0.2.hum1
Red Hat:hummingbird:1nodejs24before 0:24.18.1-0.2.2.hum10:24.18.1-0.2.2.hum1
Red Hat:hummingbird:1nodejs24-binbefore 0:24.18.1-0.2.2.hum10:24.18.1-0.2.2.hum1
Red Hat:hummingbird:1nodejs24-develbefore 0:24.18.1-0.2.2.hum10:24.18.1-0.2.2.hum1
Red Hat:hummingbird:1nodejs24-docsbefore 0:24.18.1-0.2.2.hum10:24.18.1-0.2.2.hum1
Red Hat:hummingbird:1nodejs24-full-i18nbefore 0:24.18.1-0.2.2.hum10:24.18.1-0.2.2.hum1
Red Hat:hummingbird:1nodejs24-libsbefore 0:24.18.1-0.2.2.hum10:24.18.1-0.2.2.hum1
Red Hat:hummingbird:1nodejs24-npmbefore 0:11.16.0-1.24.18.1.0.2.2.hum10:11.16.0-1.24.18.1.0.2.2.hum1
Red Hat:hummingbird:1nodejs24-npm-binbefore 0:24.18.1-0.2.2.hum10:24.18.1-0.2.2.hum1
Red Hat:hummingbird:1nodejs26before 0:26.7.0-1.5.2.hum10:26.7.0-1.5.2.hum1
Red Hat:hummingbird:1nodejs26-binbefore 0:26.7.0-1.5.2.hum10:26.7.0-1.5.2.hum1
Red Hat:hummingbird:1nodejs26-develbefore 0:26.7.0-1.5.2.hum10:26.7.0-1.5.2.hum1
Red Hat:hummingbird:1nodejs26-docsbefore 0:26.7.0-1.5.2.hum10:26.7.0-1.5.2.hum1
Red Hat:hummingbird:1nodejs26-full-i18nbefore 0:26.7.0-1.5.2.hum10:26.7.0-1.5.2.hum1
Red Hat:hummingbird:1nodejs26-libsbefore 0:26.7.0-1.5.2.hum10:26.7.0-1.5.2.hum1
Red Hat:hummingbird:1nodejs26-npmbefore 0:11.19.0-1.26.7.0.1.5.2.hum10:11.19.0-1.26.7.0.1.5.2.hum1
Red Hat:hummingbird:1nodejs26-npm-binbefore 0:26.7.0-1.5.2.hum10:26.7.0-1.5.2.hum1
Red Hat:hummingbird:1v8-14.6-develbefore 0:14.6.202.34-1.26.7.0.1.5.2.hum10:14.6.202.34-1.26.7.0.1.5.2.hum1

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-2026-15157Jul 29, 2026 · undici vulnerable to CRLF Injection via blob-like body 'type' property
    21Monitor
  • ← EarlierCVE-2026-84933Sep 4, 2026 · undici vulnerable to cross-user cookie disclosure via Set-Cookie caching in shared caches
    32Monitor
  • Later →CVE-2026-84961Sep 4, 2026 · undici vulnerable to TLS certificate validation bypass via dropped connect options in BalancedPool
    36Monitor

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
undici undici7.29.1Vendor (CNA)
undici undici8.10.2Vendor (CNA)
debian:node-undici8.10.2+dfsg+~cs3.2.2-1 · Debian:14Package registry (OSV)
npm:undici7.29.1Package registry (OSV)
npm:undici8.10.2Package registry (OSV)
opensuse:pi-coding-agent0.87.1-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:grafana12.40:12.4.10-0.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs240:24.18.1-0.2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs24-bin0:24.18.1-0.2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs24-devel0:24.18.1-0.2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs24-docs0:24.18.1-0.2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs24-full-i18n0:24.18.1-0.2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs24-libs0:24.18.1-0.2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs24-npm0:11.16.0-1.24.18.1.0.2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs24-npm-bin0:24.18.1-0.2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs260:26.7.0-1.5.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-bin0:26.7.0-1.5.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-devel0:26.7.0-1.5.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-docs0:26.7.0-1.5.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-full-i18n0:26.7.0-1.5.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-libs0:26.7.0-1.5.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-npm0:11.19.0-1.26.7.0.1.5.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-npm-bin0:26.7.0-1.5.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:v8-14.6-devel0:14.6.202.34-1.26.7.0.1.5.2.hum1 · Red Hat:hummingbird:1Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

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
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

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

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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (1 more)

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

All records