Deserialization of untrusted data in Octopus Server
Priority MEDIUM 40CWE-502Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-502.
Summary
In affected versions of Octopus Server, an authenticated user with permissions to edit an Environment or Project can set specifically crafted JSON content for the object. Insecure deserialization of this content allows the user to execute arbitrary code in the Octopus Server process.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00346 28th percentileScored 2026-11-07
Fix Fixed Octopus Server (Octopus Deploy): 2026.1.11781, 2026.2.13441, 2026.3.15829
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Octopus Deploy | Octopus Server | 2019.4.1 to before 2026.1.11781; 2026.2.0 to before 2026.2.13441; 2026.3.0 to before 2026.3.15829 | 2026.1.11781, 2026.2.13441, 2026.3.15829 | Patch available | CNA |
- Octopus Server VendorOctopus Deploy Affected 2019.4.1 to before 2026.1.11781; 2026.2.0 to before 2026.2.13441; 2026.3.0 to before 2026.3.15829 Fixed in 2026.1.11781, 2026.2.13441, 2026.3.15829 Patch available CNA
Remediation
- Fix · CNA Octopus Server (Octopus Deploy) Fixed in 2026.1.11781, 2026.2.13441, 2026.3.15829
Timeline
- 2026-10-02 Threatist record created from CVE-2026-101169
- 2026-10-03 Alias added: GHSA-cj2p-238w-jrf5
References
More Octopus Deploy vulnerabilities
- TI-2018-13353 In Octopus Deploy 2018.8.0 through 2018.9.x before 2018.9.1, an authenticated user with… CVSS 3.0HIGH 8.8
- TI-2022-02375 Improper authentication in Octopus Server CVSS 3.1CRITICAL 9.8
- TI-2022-02579 Insufficient session expiration in Octopus Server CVSS 3.1CRITICAL 9.1
- TI-2021-11816 Deserialization of untrusted data in Octopus Deploy Halibut CVSS 3.1CRITICAL 9.8
- TI-2018-08066 In Octopus Deploy 2018.4.4 through 2018.5.1, Octopus variables that are sourced from the… CVSS 3.0CRITICAL 9.8
- TI-2022-02575 In affected versions of Octopus Deploy it is possible to bypass rate limiting on login using null bytes. CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-101169 · CVE Program
- CVE-2026-101169 · NVD
- FIRST EPSS
- GHSA-cj2p-238w-jrf5 · GitHub Advisory Database · CC BY 4.0
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