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CVE-2026-18661VulnerabilityPublished

Rundeck:

Affects rundeckSource GCVE Database

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Authoritative record:CVE-2026-18661· High 8.8

Not known to be exploited · CVSS 8.8 High : upgrade to 6.0.1-r11 soon.

Data as of 13 Nov 2026, 01:27 UTC

CVSS 4.0 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 37% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 6.0.1-r11
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.

What to do

Upgrade rundeck to 6.0.1-r11.

Affected software

ProductAffectedFixed in
CleanStartrundeckpkg:apk/cleanstart/rundeckOther threatsAffected
  • <6.0.1-r11
Fixed in
  • 6.0.1-r11

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and the issue is fixed in Rundeck version 6.0.1-r11. Users should upgrade to this version or later to remediate the vulnerability. Since this is not a cloud service, manual patching is required. No other mitigations are indicated by the vendor advisory.

Description

A high-severity security vulnerability (CVE-2026-18661) affects the Rundeck package due to issues in Eclipse Jetty's handling of Jakarta Servlet security annotations across various versions of jetty-annotations and jetty-eeN-annotations. The flaw involves the authoritative URL pattern rules for mixed @ServletSecurity annotations and web.xml configurations. This vulnerability is fixed in Rundeck version 6.0.1-r11.

References

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