Skip to content
Noroxi
CVE.org (no NVD analysis yet)· CNA openjs

CVE-2026-109829: undici vulnerable to cache poisoning and cross-user disclosure via cross-origin redirects

CriticalCVSS 9.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 36/100)

  • 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: 0.14% (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 7.30.1, 8.12.2.

Low priority for now. Upgrade to undici undici 7.30.1, 8.12.2 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 is an HTTP client library for Node.js. In versions 7.0.0 through 7.30.0 and 8.0.0 through 8.12.1, when an originless Agent composes the redirect and cache interceptors in that order with a shared cache store, the cache builds its key from the original request URL before the redirect handler changes the origin, so a response produced after a cross-origin redirect is stored under the original key. An attacker who controls the target of a redirect from a trusted URL can have their response cached under that trusted URL and served to later callers, allowing persistent cache poisoning, and the same key confusion lets a private, non-stored redirect response to a user-specific resource be stored under the original URL and served to a later unauthenticated caller, disclosing private data. Applications are affected only when an originless Agent, a shared cache store, and the redirect-then-cache composition are all used. The issue is fixed in undici 7.30.1 and 8.12.2, which verify the producing origin still matches the cache key and preserve each redirect hop's cache-control policy before storing, and users should upgrade to one of those versions or later. As a workaround, compose the cache interceptor before the redirect interceptor, use per-origin dispatchers and cache stores, or disable shared caching on redirect-capable requests.

Published
Oct 15, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 4th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
9.1
CNA · openjs
7.4
1.7 point gap

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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-2026-109829

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for nodejs records
Is your version affected? Check it

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 help

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

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

    • 7.30.1, 8.12.2not affected
    • 7.0.0 and later · before 7.30.1affected · semver
    • 8.0.0 and later · before 8.12.2affected · semver

Affected versions

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

  • nodejs undici7.0.0 and later · before 7.30.1
  • nodejs undici8.0.0 and later · before 8.12.2

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10nodejsbefore 1:22.23.4-1.el10_21:22.23.4-1.el10_2
AlmaLinux:10nodejs-develbefore 1:22.23.4-1.el10_21:22.23.4-1.el10_2
AlmaLinux:10nodejs-docsbefore 1:22.23.4-1.el10_21:22.23.4-1.el10_2
AlmaLinux:10nodejs-full-i18nbefore 1:22.23.4-1.el10_21:22.23.4-1.el10_2
AlmaLinux:10nodejs-libsbefore 1:22.23.4-1.el10_21:22.23.4-1.el10_2
AlmaLinux:10nodejs-npmbefore 1:10.9.9-1.22.23.4.1.el10_21:10.9.9-1.22.23.4.1.el10_2
AlmaLinux:10nodejs24before 1:24.22.1-3.el10_21:24.22.1-3.el10_2
AlmaLinux:10nodejs24-develbefore 1:24.22.1-3.el10_21:24.22.1-3.el10_2
AlmaLinux:10nodejs24-docsbefore 1:24.22.1-3.el10_21:24.22.1-3.el10_2
AlmaLinux:10nodejs24-full-i18nbefore 1:24.22.1-3.el10_21:24.22.1-3.el10_2
AlmaLinux:10nodejs24-libsbefore 1:24.22.1-3.el10_21:24.22.1-3.el10_2
AlmaLinux:10nodejs24-npmbefore 2:11.19.1-1.24.22.1.3.el10_22:11.19.1-1.24.22.1.3.el10_2
Debian:12node-undicifrom 0—
Debian:14node-undicibefore 8.12.2+dfsg+~cs3.2.3-18.12.2+dfsg+~cs3.2.3-1
npmundicifrom 7.0.0 · before 7.30.17.30.1
npmundicifrom 8.0.0 · before 8.12.28.12.2
Red Hat:hummingbird:1nodejs24before 0:24.21.0-1.5.hum10:24.21.0-1.5.hum1
Red Hat:hummingbird:1nodejs24-binbefore 0:24.21.0-1.5.hum10:24.21.0-1.5.hum1
Red Hat:hummingbird:1nodejs24-develbefore 0:24.21.0-1.5.hum10:24.21.0-1.5.hum1
Red Hat:hummingbird:1nodejs24-docsbefore 0:24.21.0-1.5.hum10:24.21.0-1.5.hum1
Red Hat:hummingbird:1nodejs24-full-i18nbefore 0:24.21.0-1.5.hum10:24.21.0-1.5.hum1
Red Hat:hummingbird:1nodejs24-libsbefore 0:24.21.0-1.5.hum10:24.21.0-1.5.hum1
Red Hat:hummingbird:1nodejs24-npmbefore 0:11.19.0-1.24.21.0.1.5.hum10:11.19.0-1.24.21.0.1.5.hum1
Red Hat:hummingbird:1nodejs24-npm-binbefore 0:24.21.0-1.5.hum10:24.21.0-1.5.hum1

+21

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-2026-109383undici vulnerable to TLS certificate validation bypass via dropped tls options in Agent
    36Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-84890Sep 4, 2026 · undici vulnerable to Denial of Service via unbounded decompression of compressed responses
    23Monitor
  • ← EarlierCVE-2026-109855Oct 15, 2026 · undici WebSocket client vulnerable to Denial of Service via failed HTTP/2 handshake
    30Monitor
  • Later →CVE-2026-109841Oct 15, 2026 · undici vulnerable to Subresource Integrity bypass via non-lowercase algorithm tokens
    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
undici undici7.30.1Vendor (CNA)
undici undici8.12.2Vendor (CNA)
almalinux:nodejs1:22.23.4-1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs-devel1:22.23.4-1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs-docs1:22.23.4-1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs-full-i18n1:22.23.4-1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs-libs1:22.23.4-1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs-npm1:10.9.9-1.22.23.4.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs241:24.22.1-3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-devel1:24.22.1-3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-docs1:24.22.1-3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-full-i18n1:24.22.1-3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-libs1:24.22.1-3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-npm2:11.19.1-1.24.22.1.3.el10_2 · AlmaLinux:10Package registry (OSV)
debian:node-undici8.12.2+dfsg+~cs3.2.3-1 · Debian:14Package registry (OSV)
npm:undici7.30.1Package registry (OSV)
npm:undici8.12.2Package registry (OSV)
red hat:nodejs240:24.21.0-1.5.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs24-bin0:24.21.0-1.5.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs24-devel0:24.21.0-1.5.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs260:26.11.1-0.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-bin0:26.11.1-0.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-devel0:26.11.1-0.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-docs0:26.11.1-0.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-full-i18n0:26.11.1-0.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-libs0:26.11.1-0.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-npm0:11.20.0-1.26.11.1.0.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nodejs26-npm-bin0:26.11.1-0.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:v8-14.6-devel0:14.6.202.34-1.26.11.1.0.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
rocky linux:nodejs-nodemon0:3.1.14-2.module+el9.8.0+40264+d9b257bb · Rocky Linux:9Package 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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 14, 2026+29 d
EPSS, last 120 days

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

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-2026-6734120 days apartundici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse
    35Monitor
  • CVE-2026-8515241 days apartundici vulnerable to cross-origin cache poisoning via missing origin isolation in interceptors
    29Monitor

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Not on record for this CVE: patch commit or PR link.

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

Weakness class (CWE)

CWE-346 · Origin Validation Error

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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. CVSS7.4 → 9.1
  2. Severityhigh → critical
  3. SSVC exploitation— → none
  4. Exploit maturity— → none
  5. 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