CVE-2026-76235: Cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via cockpitlang cookie in send_login_html
Vulnerability summary
CVE-2026-76235 is a high (CVSS 7.5) vulnerability in cockpit. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 49.1% of scored vulnerabilities.
Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Timeline
- 19-08-2026PublishedVulnerability first disclosed.
- 03-11-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.61%
Chance of exploitation in the next 30 days
Percentile
49%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.61% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Mageia2 products
- cockpit< 356.2-1.1.mga10
- cockpit< 356.2-1.1.mga9
Debian1 product
- cockpitAll versions (No fix recorded) | < 337-1+deb13u2 | < 366-1
Ubuntu1 product
- cockpitAll versions (No fix recorded)
3 vendors · 4 products
