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Medium, CVSS 5.7amended

SiYuan MCP asset.upload Reads Arbitrary Absolute File Paths (Workspace Boundary Bypass)

CVE-2026-82233GHSA-p23f-cm6q-2qp8

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/siyuan-note/siyuan/kernel 0.0.0-20260813142104-b26a4a307b8a), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.7 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
EPSS
  • CVE-2026-82233: 0.40% estimated exploitation activity in the next 30 days; percentile 34.54 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Security Advisory — SiYuan MCP asset.upload Reads Arbitrary Absolute File Paths (Workspace Boundary Bypass) | Field | Value | |---|---| | Disclosed by | joysinleung (joysinleung@gmail.com) | | Report date | 2026-08-13 | | Product | SiYuan (思源笔记) — siyuan-note/siyuan | | Go module | github.com/siyuan-note/siyuan/kernel | | Affected versions | <= 3.8.0 (latest release at report time; statically confirmed on v3.8.0) | | Patched versions | 3.8.1 | | Component | kernel/mcp/tools/asset.go (assetUpload), kernel/model/upload.go (InsertLocalAssets) | | Relationship to prior advisory | Residual of CVE-2026-66012 (GHSA-cvhv-7xhj-xjp8) MCP remediation. See §Relationship. | | EPSS (exploitation probability) | Low. Requires the AI Agent to invoke asset.upload and the user to approve the (category-level) confirmation; reachable via prompt-injection of the agent. | | KEV (CISA Known Exploited) | No (not listed in CISA KEV at report time). | | Default-config reachable | Partial — requires the…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-p23f-cm6q-2qp8

  2. Revision 2 · amended ·

    Amended from osv record GO-2026-6655

  3. Revision 1 · created ·

    Published from osv record GHSA-p23f-cm6q-2qp8

Agent brief

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# Patch Next advisory brief: CVE-2026-82233

Advisory: SiYuan MCP asset.upload Reads Arbitrary Absolute File Paths (Workspace Boundary Bypass)
IDs: CVE-2026-82233, GHSA-p23f-cm6q-2qp8
Record: https://patchnext.com/advisories/cve-2026-82233 (revision 3, source checked 26 Oct 2026, 15:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/siyuan-note/siyuan/kernel 0.0.0-20260813142104-b26a4a307b8a. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/siyuan-note/siyuan/kernel: affected < 0.0.0-20260813142104-b26a4a307b8a; fixed in 0.0.0-20260813142104-b26a4a307b8a

## Suggested inspection (read-only)
- Go github.com/siyuan-note/siyuan/kernel: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/siyuan-note/siyuan/kernel.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GO-2026-6655 (OSV record GO-2026-6655 lists affected ranges: Go github.com/siyuan-note/siyuan/kernel >=0 <0.0.0-20260813142104-b26a4a307b8a (fixed))
- Verified: https://osv.dev/vulnerability/GHSA-p23f-cm6q-2qp8 (OSV record GHSA-p23f-cm6q-2qp8 lists affected ranges: Go github.com/siyuan-note/siyuan/kernel >=0 <0.0.0-20260813142104-b26a4a307b8a (fixed))
- Verified: https://github.com/advisories/GHSA-p23f-cm6q-2qp8 (GitHub-reviewed advisory GHSA-p23f-cm6q-2qp8 lists affected ranges: Go github.com/siyuan-note/siyuan/kernel >=0 <0.0.0-20260813142104-b26a4a307b8a)

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