Critical severity9.1NVD Advisory· Published Aug 21, 2026· Updated Aug 21, 2026

CVE-2026-77086

Description

SiYuan before v3.7.4 fails to validate the packageName parameter in Bazaar install and uninstall endpoints, allowing authenticated administrators to perform path traversal via directory traversal sequences. Attackers with admin access can write arbitrary files to any location via install operations or recursively delete directories via uninstall operations by supplying crafted packageName values.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Siyuan Note/Siyuanllm-fuzzy
Range: <3.7.4

Patches

Vulnerability mechanics

References

github.com/siyuan-note/siyuan/security/advisories/GHSA-wr4w-7vjm-mmx3nvd
www.vulncheck.com/advisories/siyuan-before-path-traversal-via-packagenamenvd

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