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TI-2021-11816 Aliases CVE-2021-31819GHSA-hpf7-4c2g-9chf

Deserialization of untrusted data in Octopus Deploy Halibut

Priority MEDIUM 47CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

In Halibut versions prior to 4.4.7 there is a deserialisation vulnerability that could allow remote code execution on systems that already trust each other based on certificate verification.

Why it matters now

EPSS 0.02355 83rd percentileScored 2026-11-07
Fix Fixed Halibut (Octopus Deploy): 4.4.7Halibut (NuGet): 4.4.7

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Octopus DeployHalibutbefore 4.4.74.4.7Patch availableCNA
—Halibut (NuGet)before 4.4.74.4.7Patch availableGHSA-hpf7-4c2g-9chf
  • Halibut VendorOctopus Deploy Affected before 4.4.7 Fixed in 4.4.7 Patch available CNA
  • Halibut (NuGet) Vendor— Affected before 4.4.7 Fixed in 4.4.7 Patch available GHSA-hpf7-4c2g-9chf

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:octopus:halibut:*:*:*:*:*:*:*:*before 4.4.7VulnerableOctopus Deploy
  • cpe:2.3:a:octopus:halibut:*:*:*:*:*:*:*:* Versions before 4.4.7 Vulnerable ·Octopus Deploy

Remediation

  • Fix · CNA Halibut (Octopus Deploy) Fixed in 4.4.7
  • Fix · GHSA-hpf7-4c2g-9chf Halibut (NuGet) Fixed in 4.4.7 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-31819
  2. 2026-10-03 Alias added: GHSA-hpf7-4c2g-9chf

References

Advisory 1

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences