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NVD / CVE Program· CNA redhat

CVE-2026-91147: Cockpit: cockpit: denial of service in `cockpit-ws` due to url-root handling without a trailing slash

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: 0.64% (FIRST EPSS); higher than 50.9% 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: cockpit (AlmaLinux:8) 310.10-1.el8_10; cockpit-bridge (AlmaLinux:8) 310.10-1.el8_10; cockpit-doc (AlmaLinux:8) 310.10-1.el8_10.

Low priority for now. Upgrade to cockpit (AlmaLinux:8) 310.10-1.el8_10; cockpit-bridge (AlmaLinux:8) 310.10-1.el8_10; cockpit-doc (AlmaLinux:8) 310.10-1.el8_10 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-ws`. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by sending a specially crafted request. When the `WebService.UrlRoot` is configured and a request is made to the exact URL-root prefix without a trailing slash, `cockpit-ws` can terminate unexpectedly. This issue leads to the unavailability of the Cockpit web service.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Sep 18, 2026
Updated
Nov 9, 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
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
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.

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-2026-91147

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

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • 0:310.10-1.el8_10 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9

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

  • Red Hat Red Hat OpenShift Dev Spaces

    • all versionsaffected
    • all versionsaffected
    • all versionsaffected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8cockpitbefore 310.10-1.el8_10310.10-1.el8_10
AlmaLinux:8cockpit-bridgebefore 310.10-1.el8_10310.10-1.el8_10
AlmaLinux:8cockpit-docbefore 310.10-1.el8_10310.10-1.el8_10
AlmaLinux:8cockpit-systembefore 310.10-1.el8_10310.10-1.el8_10
AlmaLinux:8cockpit-wsbefore 310.10-1.el8_10310.10-1.el8_10
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:8cockpitbefore 0:310.10-1.el8_100:310.10-1.el8_10
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-2026-93653Sep 18, 2026 · Poppler: poppler: unbounded cpu loop in splashoutputdev::tilingpatternfill via unvalidated tiling-pattern repeat count (denial of service)
    22Monitor
  • ← EarlierCVE-2026-91142Sep 18, 2026 · Cockpit: cockpit: unauthorized modification of login records via integer overflow
    14Monitor
  • Later →CVE-2026-91149Sep 18, 2026 · Cockpit: cockpit: denial of service via unbounded connection thread spawning
    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:cockpit310.10-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:cockpit-bridge310.10-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:cockpit-doc310.10-1.el8_10 · AlmaLinux:8Package 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-system310.10-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:cockpit-ws310.10-1.el8_10 · AlmaLinux:8Package 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:cockpit0:310.10-1.el8_10 · Rocky Linux:8Package 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-2026-11984346 days apartGst-plugins-good: assertion failures in FLV demuxer when parsing malformed enhanced audio/video tags
    26Monitor
  • CVE-2026-5271895 days apartGstreamer1-plugins-bad-free: gstreamer: denial of service via av1 tile_list_obu parser byte/bit confusion
    26Monitor
  • CVE-2026-12074949 days apartDbus: dbus-daemon: dbus-daemon aborts (reply_serial != 0) when a broadcast from the driver cannot be delivered to a monitored bus
    24Monitor
  • CVE-2026-8553414 days apartLibsoup: libsoup: http/2 client crash in on_data_source_read_callback when settings initial_window_size shrinks during deferred body read
    23Monitor
  • CVE-2026-8909828 days apartNfs-utils: nfs-utils: denial of service via assertion failure in fsidd
    22Monitor

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.
  • 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-617 · Reachable Assertion

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (4 more)

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

All records