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CVE-2026-6733· NVD / CVE Program· CNA openjs

undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse

Noroxi assessment

Priority: Monitor (action score 14/100)

  • 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: 0.27% (FIRST EPSS).
  • 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: undici undici 6.26.0, 7.28.0, 8.5.0.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to undici undici 6.26.0, 7.28.0, 8.5.0 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

Impact: Undici's HTTP/1.1 client is vulnerable to response queue poisoning on reused keep-alive sockets. An attacker-controlled upstream server can inject an unsolicited HTTP/1.1 response onto an idle socket after a request completes. When the client dispatches the next request on that socket, it associates the injected response with the new request, causing responses to be delivered to the wrong requests. This requires an attacker-controlled or compromised upstream HTTP/1.1 server and keep-alive connection reuse. Patches: Upgrade to undici v6.26.0, v7.28.0 or v8.5.0. Workarounds: Disable keep-alive connection reuse by setting keepAliveTimeout: 0 on the Client or Pool.

LowCVSS 3.7 · v3.1—No exploit Fix available
Published
Jun 17, 2026
Updated
Jun 27, 2026
EPSS
0.2% · 18th percentile

Report tools

JSON

Action score

14

Monitor

Low priority for now.

CVSS
14 / 40 · 3.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · openjs
3.7
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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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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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 undicibefore 6.27.0
  • nodejs undici7.0.0 and later · before 7.28.0
  • nodejs undici8.0.0 and later · before 8.5.0

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

    • 6.26.0, 7.28.0, 8.5.0not affected
    • before 6.26.0affected · semver
    • 7.0.0 and later · before 7.28.0affected · semver
    • 8.0.0 and later · before 8.5.0affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10nodejsbefore 1:22.23.1-2.el10_21:22.23.1-2.el10_2
AlmaLinux:10nodejs-develbefore 1:22.23.1-2.el10_21:22.23.1-2.el10_2
AlmaLinux:10nodejs-docsbefore 1:22.23.1-2.el10_21:22.23.1-2.el10_2
AlmaLinux:10nodejs-full-i18nbefore 1:22.23.1-2.el10_21:22.23.1-2.el10_2
AlmaLinux:10nodejs-libsbefore 1:22.23.1-2.el10_21:22.23.1-2.el10_2
AlmaLinux:10nodejs-npmbefore 1:10.9.8-1.22.23.1.2.el10_21:10.9.8-1.22.23.1.2.el10_2
AlmaLinux:10nodejs24before 1:24.18.0-1.el10_21:24.18.0-1.el10_2
AlmaLinux:10nodejs24-develbefore 1:24.18.0-1.el10_21:24.18.0-1.el10_2
AlmaLinux:10nodejs24-docsbefore 1:24.18.0-1.el10_21:24.18.0-1.el10_2
AlmaLinux:10nodejs24-full-i18nbefore 1:24.18.0-1.el10_21:24.18.0-1.el10_2
AlmaLinux:10nodejs24-libsbefore 1:24.18.0-1.el10_21:24.18.0-1.el10_2
AlmaLinux:10nodejs24-npmbefore 1:11.16.0-1.24.18.0.1.el10_21:11.16.0-1.24.18.0.1.el10_2
AlmaLinux:8nodejsbefore 1:22.23.1-1.module_el8.10.0+4231+1bf2f8551:22.23.1-1.module_el8.10.0+4231+1bf2f855
AlmaLinux:8nodejsbefore 1:24.18.0-1.module_el8.10.0+4228+2938bc941:24.18.0-1.module_el8.10.0+4228+2938bc94
AlmaLinux:8nodejs-develbefore 1:22.23.1-1.module_el8.10.0+4231+1bf2f8551:22.23.1-1.module_el8.10.0+4231+1bf2f855
AlmaLinux:8nodejs-develbefore 1:24.18.0-1.module_el8.10.0+4228+2938bc941:24.18.0-1.module_el8.10.0+4228+2938bc94
AlmaLinux:8nodejs-docsbefore 1:24.18.0-1.module_el8.10.0+4228+2938bc941:24.18.0-1.module_el8.10.0+4228+2938bc94
AlmaLinux:8nodejs-docsbefore 1:22.23.1-1.module_el8.10.0+4231+1bf2f8551:22.23.1-1.module_el8.10.0+4231+1bf2f855
AlmaLinux:8nodejs-full-i18nbefore 1:22.23.1-1.module_el8.10.0+4231+1bf2f8551:22.23.1-1.module_el8.10.0+4231+1bf2f855
AlmaLinux:8nodejs-full-i18nbefore 1:24.18.0-1.module_el8.10.0+4228+2938bc941:24.18.0-1.module_el8.10.0+4228+2938bc94
AlmaLinux:8nodejs-libsbefore 1:22.23.1-1.module_el8.10.0+4231+1bf2f8551:22.23.1-1.module_el8.10.0+4231+1bf2f855
AlmaLinux:8nodejs-libsbefore 1:24.18.0-1.module_el8.10.0+4228+2938bc941:24.18.0-1.module_el8.10.0+4228+2938bc94
AlmaLinux:8nodejs-nodemonbefore 3.0.3-1.module_el8.10.0+4061+f8ceeab93.0.3-1.module_el8.10.0+4061+f8ceeab9
AlmaLinux:8nodejs-nodemonbefore 3.0.1-1.module_el8.10.0+3956+47c9ee9f3.0.1-1.module_el8.10.0+3956+47c9ee9f

+96

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-2026-9675Jun 17, 2026 · undici WebSocket client vulnerable to denial of service via cumulative fragment bypass
    30Monitor
  • ← EarlierCVE-2026-11525Jun 17, 2026 · undici vulnerable to Set-Cookie SameSite attribute downgrade via permissive substring matching
    14Monitor
  • Later →CVE-2026-6734Jun 17, 2026 · undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse
    35Monitor

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 undici6.26.0Vendor (CNA)
undici undici7.28.0Vendor (CNA)
undici undici8.5.0Vendor (CNA)
almalinux:nodejs1:22.23.1-2.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs-devel1:22.23.1-2.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs-docs1:22.23.1-2.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs-full-i18n1:22.23.1-2.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs-libs1:22.23.1-2.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs-npm1:10.9.8-1.22.23.1.2.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs241:24.18.0-1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-devel1:24.18.0-1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-docs1:24.18.0-1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-full-i18n1:24.18.0-1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-libs1:24.18.0-1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:nodejs24-npm1:11.16.0-1.24.18.0.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:node-undici8.5.0+dfsg+~cs3.2.0-1 · Debian:14Package registry (OSV)
npm:undici6.27.0Package registry (OSV)
npm:undici7.28.0Package registry (OSV)
npm:undici8.5.0Package registry (OSV)
opensuse:nodejs2424.17.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:nodejs1:22.23.1-2.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:nodejs-debuginfo1:22.23.1-2.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:nodejs-devel1:22.23.1-2.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:nodejs241:24.18.0-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:nodejs24-debuginfo1:24.18.0-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:nodejs24-debugsource1:24.18.0-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:nodejs24-devel1:24.18.0-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:nodejs24-docs1:24.18.0-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:nodejs24-full-i18n1:24.18.0-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:nodejs24-libs1:24.18.0-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+9

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.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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

Weakness class (CWE)

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition

CVSS vector

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

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.

ATT&CK techniques

—

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