CVE-2026-76235Cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via cockpitlang cookie in send_login_html
- 7.5HighCVSS base score
- 0.63%Exploitation in 30 daysEPSS · top 49% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By redhat
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.63% · top 49% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
Red Hat · Red Hat Enterprise Linux 10
- unaffected 0:356.4-1.el10_2 – < *
Red Hat · Red Hat Enterprise Linux 10
- unaffected 0:366.1-1.el10_3 – < *
Red Hat · Red Hat Enterprise Linux 8
- unaffected 0:310.10-1.el8_10 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:356.4-1.el9_8 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:366.1-1.el9_9 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:356.4-1.el9_8 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:366.1-1.el9_9 – < *
Red Hat · Red Hat Enterprise Linux 7
All versions: affected
Red Hat · Red Hat OpenShift Dev Spaces
All versions: unaffected
Red Hat · Red Hat OpenShift Dev Spaces
All versions: unaffected
Red Hat · Red Hat OpenShift Dev Spaces
All versions: unaffected
What to do
Workaround: Restrict network access to the cockpit port to trusted clients until a fix is available. No configuration-level mitigation removes the flaw entirely, since the login page must remain reachable without authentication.
References
References7
- RHSA-2026:94485 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:94533 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:96250 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:98463 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:98567 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-76235 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2519497 (opens in a new tab)issue-trackingx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-62393 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-76235)Record last updated .