Skip to content
Fencer Vulns
high 7.5

CVE-2026-76235 json

Cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via cockpitlang cookie in send_login_html

published 2026-08-19 2 mo ago modified 2026-11-06 3 d ago also EUVD-2026-62393

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

A memory leak flaw was found in cockpit-ws. The login page handler leaks a heap allocation on every unauthenticated request that carries a CockpitLang cookie, allowing a remote unauthenticated attacker to exhaust memory on the host and cause a denial of service.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 8 0:310.10-1.el8_10
  • Red Hat Red Hat Enterprise Linux 9 0:356.4-1.el9_8
  • cockpit Debian 13 337-1+deb13u2
  • cockpit Debian 14 366-1

debian advisories DEBIAN-CVE-2026-76235

  • cockpit AlmaLinux 8 310.10-1.el8_10
  • cockpit-ws AlmaLinux 8 310.10-1.el8_10
  • cockpit-bridge AlmaLinux 8 310.10-1.el8_10
  • cockpit-system AlmaLinux 8 310.10-1.el8_10
  • cockpit AlmaLinux 9 356.4-1.el9_8
  • cockpit-ws AlmaLinux 9 356.4-1.el9_8
  • cockpit-bridge AlmaLinux 9 356.4-1.el9_8
  • cockpit-system AlmaLinux 9 356.4-1.el9_8

almalinux advisories ALSA-2026:94485ALSA-2026:94533

  • cockpit Rocky Linux 9 356.4-1.el9_8.rocky.0.1
  • cockpit Rocky Linux 8 310.10-1.el8_10

rocky linux advisories RLSA-2026:94533RLSA-2026:94485

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-76235 updated cvss 7.5

cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in send_login_html

  • Red Hat Enterprise Linux 7 cockpit, cockpit-ws, cockpit-bridge, cockpit-system, cockpit-machines-ovirt Red Hat Enterprise Linux 10 cockpit
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) cockpit-storaged 356.4-1.el9_8, cockpit-packagekit 356.4-1.el9_8
    fixed: vendor fix RHSA-2026:94533
  • Red Hat Enterprise Linux BaseOS (v. 8) cockpit 310.10-1.el8_10, cockpit-ws 310.10-1.el8_10, cockpit-bridge 310.10-1.el8_10, cockpit-system 310.10-1.el8_10
    fixed: vendor fix RHSA-2026:94485
  • Red Hat Enterprise Linux BaseOS (v. 9) cockpit 356.4-1.el9_8, cockpit-ws 356.4-1.el9_8, cockpit-bridge 356.4-1.el9_8, cockpit-system 356.4-1.el9_8, cockpit-ws-selinux 356.4-1.el9_8
    fixed: vendor fix RHSA-2026:94533
  • Red Hat OpenShift Dev Spaces devspaces/udi-rhel9, devspaces/udi-base-rhel9, devspaces/udi-base-rhel10
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat OpenShift Dev Spaces

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.