High severity7.6NVD Advisory· Published Sep 26, 2026· Updated Oct 5, 2026

CVE-2026-100637

Description

SiYuan versions before v3.8.4 contain a path traversal vulnerability in the checkoutRepo endpoint that allows authenticated administrators to write JSON files outside the workspace. Attackers can supply a sessionID parameter containing directory traversal sequences to overwrite arbitrary JSON files in pre-existing kernel-writable directories outside workspace boundaries.

AI Insight

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

Affected products

Siyuan Note/Siyuanllm-fuzzy
Range: <3.8.4

Patches

Vulnerability mechanics

References

github.com/siyuan-note/siyuan/security/advisories/GHSA-jhmh-hr4g-c5g2nvd
www.vulncheck.com/advisories/siyuan-before-3.8.4-path-traversal-via-checkoutrepo-sessionidnvd

News mentions

Siyuan Note: Batch of 14 High/Medium Severity Vulnerabilities Disclosed Together
Vypr Intelligence · Sep 26, 2026

cvss	0.494
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000