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NVD / CVE Program· CNA redhat

CVE-2026-91149: Cockpit: cockpit: denial of service via unbounded connection thread spawning

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: 0.57% (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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: cockpit (AlmaLinux:9) 356.4-1.el9_8; cockpit-bridge (AlmaLinux:9) 356.4-1.el9_8; cockpit-doc (AlmaLinux:9) 356.4-1.el9_8.

Low priority for now. Upgrade to cockpit (AlmaLinux:9) 356.4-1.el9_8; cockpit-bridge (AlmaLinux:9) 356.4-1.el9_8; cockpit-doc (AlmaLinux:9) 356.4-1.el9_8 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

A flaw was found in Cockpit. An unauthenticated remote attacker can exploit this vulnerability by initiating and sustaining numerous simultaneous connections to the `cockpit-tls` service. This forces the service to create an unbounded number of detached threads, consuming system resources such as memory and file descriptors. The primary consequence is a denial of service (DoS), leading to degradation or complete unavailability of the Cockpit service for legitimate users.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Sep 18, 2026
Updated
Nov 11, 2026
EPSS
0.5% · 47th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
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.

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-2026-91149

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.

—

Versions reported by the vendor

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

  • Red Hat Red Hat Enterprise Linux 10

    • 0:356.4-1.el10_2 and laternot affected · rpm
    • 0:366.1-1.el10_3 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9

    • 0:356.4-1.el9_8 and laternot affected · rpm
    • 0:366.1-1.el9_9 and laternot affected · rpm
    • 0:356.4-1.el9_8 and laternot affected · rpm
    • 0:366.1-1.el9_9 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Dev Spaces

    • all versionsunknown
    • all versionsunknown
    • all versionsunknown

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:9cockpitbefore 356.4-1.el9_8356.4-1.el9_8
AlmaLinux:9cockpit-bridgebefore 356.4-1.el9_8356.4-1.el9_8
AlmaLinux:9cockpit-docbefore 356.4-1.el9_8356.4-1.el9_8
AlmaLinux:9cockpit-packagekitbefore 356.4-1.el9_8356.4-1.el9_8
AlmaLinux:9cockpit-storagedbefore 356.4-1.el9_8356.4-1.el9_8
AlmaLinux:9cockpit-systembefore 356.4-1.el9_8356.4-1.el9_8
AlmaLinux:9cockpit-wsbefore 356.4-1.el9_8356.4-1.el9_8
AlmaLinux:9cockpit-ws-selinuxbefore 356.4-1.el9_8356.4-1.el9_8
Debian:12cockpitfrom 0—
Debian:14cockpitbefore 368-1368-1
openSUSE:Tumbleweedcockpitbefore 370-1.1370-1.1
Rocky Linux:10cockpitbefore 0:356.4-1.el10_2.rocky.0.10:356.4-1.el10_2.rocky.0.1
Rocky Linux:9cockpitbefore 0:356.4-1.el9_8.rocky.0.10:356.4-1.el9_8.rocky.0.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    44Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-91142Sep 18, 2026 · Cockpit: cockpit: unauthorized modification of login records via integer overflow
    14Monitor
  • ← EarlierCVE-2026-91147Sep 18, 2026 · Cockpit: cockpit: denial of service in `cockpit-ws` due to url-root handling without a trailing slash
    23Monitor
  • Later →CVE-2026-92745Sep 18, 2026 · Cockpit-machines: cockpit-machines: information disclosure of rhsm offline token via process arguments
    20Monitor

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:cockpit356.4-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:cockpit-bridge356.4-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:cockpit-doc356.4-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:cockpit-packagekit356.4-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:cockpit-storaged356.4-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:cockpit-system356.4-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:cockpit-ws356.4-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:cockpit-ws-selinux356.4-1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:cockpit368-1 · Debian:14Package registry (OSV)
opensuse:cockpit370-1.1 · openSUSE:TumbleweedPackage registry (OSV)
rocky linux:cockpit0:356.4-1.el9_8.rocky.0.1 · Rocky Linux:9Package 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.

  • CVE-2026-1864943 days apartGstreamer1-plugins-good: gst-plugins-good: unbounded memory growth in rtph264depay and rtph265depay rtp depayloaders
    30Monitor
  • CVE-2026-11232252 days apartKrb5: mit krb5 kadmind unauthenticated cpu dos via auth_gssapi client states cleanup
    30Monitor
  • CVE-2026-1571166 days apartLibsoup: soupwebsocketconnection: libsoup: websocket remote denial of service via oversized control frame protocol violation
    30Monitor
  • CVE-2025-32049533 days apartLibsoup: denial of service attack to websocket server
    30Monitor
  • CVE-2026-8523128 days apartLibtirpc: libtirpc: denial of service via unbounded memory allocation during rpcsec_gss decoding
    26Monitor
  • CVE-2026-11231952 days apartKrb5: mit krb5 kadmind authenticated memory exhaustion dos via unbounded rpc xdr allocation
    26Monitor

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

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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 Throttling

CVSS vector

CVSS:3.1/AV:N/AC:L/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 (5 more)

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

All records