CVE-2026-92812 decaporg CVE debrief

Who should care

Defenders responsible for decap-server installations, security teams, and developers using decap-server should be aware of this vulnerability and take necessary actions to mitigate the risk.

Why it matters

CVE-2026-92812 is a high-severity path traversal vulnerability in decap-server that allows attackers to access and modify files outside the repository root. Defenders should prioritize patching and monitoring to prevent potential attacks.

• Potential unauthorized file access outside the repository root
• Possible data breaches or modifications
• Need for verification of decap-server installations
• Potential for lateral movement within the network

Technical summary

The decap-server package contains a path traversal vulnerability in its local proxy containment guard. The vulnerability arises from the use of plain string prefix comparison without proper path separator validation. This flaw allows attackers to access sibling directories whose names begin with the repository directory name, potentially leading to unauthorized file reads, writes, or deletions outside the intended repository root.

Defensive priority

Defenders should prioritize verifying and patching decap-server installations to prevent potential path traversal attacks. This involves assessing exposure, applying patches or workarounds, and monitoring for suspicious activity.

Recommended defensive actions

• Verify decap-server installations for exposure
• Apply patches or workarounds to prevent path traversal
• Monitor for suspicious activity
• Assess and update inventory of affected systems
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and references to source code and advisories. The vulnerability affects decap-server installations, and defenders should verify the presence of affected systems in their environment. The CVE record was published on 2026-09-16T21:17:31.017Z and has not been modified since then. There are references to source code and advisories that provide additional context.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.