CVE-2026-77086 SiYuan before v3.7.4 Path Traversal via packageName
Authenticated administrators can exploit path traversal in SiYuan to write arbitrary files or delete directories, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77086?
CVE-2026-77086 is a critical path traversal vulnerability in siyuan-note siyuan, published on 21 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-77086?
How do I fix CVE-2026-77086?
No fix has been published for CVE-2026-77086 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-77086 being exploited?
There is no known exploitation of CVE-2026-77086 in the wild and no public exploit code.
Sources
Also known as GHSA-w7g2-952j-gmgr.