# CVE-2026-33669: SiYuan has Arbitrary Document Reading within the Publishing Service


- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 26 Mar 2026
- **Updated:** 27 Mar 2026
- **Also known as:** GHSA-34xj-66v3-6j83, GO-2026-4842

## What is CVE-2026-33669?

CVE-2026-33669 is a critical vulnerability in B3log Siyuan, published on 26 Mar 2026. 

### Official description

SiYuan is a personal knowledge management system. Prior to version 3.6.2, document IDs were retrieved via the /api/file/readDir interface, and then the /api/block/getChildBlocks interface was used to view the content of all documents. Version 3.6.2 patches the issue.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-33669?

5 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | None |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | None |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | None |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions to 0.0.0-20260317012524-fe4523fff2c8 | None |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions to 0.0.0-20260317012524-fe4523fff2c8 | None |

Products: B3log Siyuan.

## How do I fix CVE-2026-33669?

Upgrade to a fixed version.

## Is CVE-2026-33669 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33669 exists.

## Other vulnerabilities in B3log Siyuan

- [CVE-2026-32938](https://insights.sbomify.com/CVE-2026-32938/): SiYuan has an Arbitrary File Read in its Desktop Publish Service (critical 9.9)
- [CVE-2026-33670](https://insights.sbomify.com/CVE-2026-33670/): SiYuan has directory traversal within its publishing service (critical 9.8)
- [CVE-2026-32767](https://insights.sbomify.com/CVE-2026-32767/): SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API (critical 9.8)
- [CVE-2024-53504](https://insights.sbomify.com/CVE-2024-53504/): SQL injection in n/a (critical 9.8)
- [CVE-2024-53505](https://insights.sbomify.com/CVE-2024-53505/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33669 and fix it if it is affected.

What it is: CVE-2026-33669 is a critical vulnerability in B3log Siyuan, published on 26 Mar 2026. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33669 exists.

Affected packages and fixed versions:
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; no fix listed
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; no fix listed
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; no fix listed
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions up to 0.0.0-20260317012524-fe4523fff2c8; no fix listed
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions up to 0.0.0-20260317012524-fe4523fff2c8; no fix listed

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-2026-33669/ (Markdown: https://insights.sbomify.com/CVE-2026-33669/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33669
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33669
- OSV: https://osv.dev/vulnerability/CVE-2026-33669

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33669/
Summaries are generated and may contain mistakes; the official description above is the record.