# CVE-2026-73605: SiYuan before v3.7.4 Path Traversal via getUniqueFilename

> Attackers can probe filesystem existence via path traversal in SiYuan, enabling reconnaissance of host files and directories.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 13 Aug 2026
- **Updated:** 14 Aug 2026
- **Also known as:** GHSA-hf8h-97gm-4x2p, GO-2026-6626

## What is CVE-2026-73605?

CVE-2026-73605 is a medium-severity path traversal vulnerability in siyuan-note siyuan, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

SiYuan versions before v3.7.4 contain a path traversal vulnerability in the getUniqueFilename endpoint that allows anonymous readers to probe filesystem existence without validation or confinement. Attackers can supply arbitrary absolute paths to determine whether files and directories exist on the host, enabling reconnaissance of the filesystem layout and installed software.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-73605?

3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | 0.0.0-20260812083335-251596fc0de2 |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | 0.0.0-20260812083335-251596fc0de2 |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | 0.0.0-20260812083335-251596fc0de2 |

## How do I fix CVE-2026-73605?

Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260812083335-251596fc0de2 or later.

## Is CVE-2026-73605 being exploited?

There is no known exploitation of CVE-2026-73605 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73605 and fix it if it is affected.

What it is: CVE-2026-73605 is a medium-severity path traversal vulnerability in siyuan-note siyuan, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-73605 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260812083335-251596fc0de2
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260812083335-251596fc0de2
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260812083335-251596fc0de2

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-73605/ (Markdown: https://insights.sbomify.com/CVE-2026-73605/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73605
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73605
- OSV: https://osv.dev/vulnerability/CVE-2026-73605

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73605/
Summaries are generated and may contain mistakes; the official description above is the record.