CVE-2026-33194VulnerabilityPublished 18 Mar 2026Updated 5 Nov 2026

github.com/siyuan-note/siyuan/kernel · Kernel: SiYuan has an Incomplete Fix for IsSensitivePath Denylist Allows File Read from /opt, /usr, /home

Affects github.com/siyuan-note/siyuan/kernelSource GCVE Database

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Authoritative record:CVE-2026-33194· Medium 6.8

Not known to be exploited · CVSS 6.8 Medium : upgrade to 3.6.2 when convenient.

Data as of 5 Nov 2026, 22:34 UTC

CVSS 3.1 base score

6.8Medium

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 3.6.2

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: High
User Interaction: None
Scope: Changed
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: High: The attacker is authorized with (i.e., requires) privileges that provide significant (e.g., administrative) control over the vulnerable component that could affect component-wide settings and files.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade github.com/siyuan-note/siyuan/kernel to 3.6.2.

Affected software

Product	Affected	Fixed in
Gogithub.com/siyuan-note/siyuan/kernel	Affected <3.6.2	Fixed in 3.6.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

## Summary The `IsSensitivePath()` function in `kernel/util/path.go` uses a denylist approach that was recently expanded (GHSA-h5vh-m7fg-w5h6, commit 9914fd1) but remains incomplete. Multiple security-relevant Linux directories are not blocked, including `/opt` (application data), `/usr` (local configs/binaries), `/home` (other users), `/mnt` and `/media` (mounted volumes). The `globalCopyFiles` and `importStdMd` endpoints rely on `IsSensitivePath` as their primary defense against reading files outside the workspace. ## Details Current denylist in `kernel/util/path.go:391-405`: ```go prefixes := []string{ "/.", // dotfiles "/etc", // system config "/root", // root home "/var", // variable data "/proc", // process info "/sys", // sysfs "/run", // runtime data "/bin", // binaries "/boot", // boot files "/dev", // devices "/lib", // libraries "/srv", // service data "/tmp", // temp files } ``` **NOT blocked:** - `/opt` — commonly contains application data, databases, credentials. In SiYuan Docker, `/opt/siyuan/` contains the application itself. - `/usr` — contains `/usr/local/etc`, `/usr/local/share`, custom configs - `/home` — other users' home directories (only `~/.ssh` and `~/.config` of the current HomeDir are blocked via separate checks, but other users' homes are accessible) - `/mnt`, `/media` — mounted volumes, network shares, often containing secrets - `/snap` — snap package data - `/sbin`, `/lib64` — system binaries/libraries The `globalCopyFiles` endpoint at `kernel/api/file.go:82` uses `IsSensitivePath` as its sole path validation: ```go if util.IsSensitivePath(absSrc) { // reject continue } // File is copied into workspace — then readable via /api/file/getFile ``` ## PoC ```bash # Read SiYuan's own application files from /opt (Docker deployment) curl -s 'http://127.0.0.1:6806/api/file/globalCopyFiles' \ -H 'Authorization: Token YOUR_API_TOKEN' \ -H 'Content-Type: application/json' \ -d '{"srcs":["/opt/siyuan/kernel/SiYuan-Kernel"],"destDir":"data/assets"}' # Then read the copied file from workspace curl -s 'http://127.0.0.1:6806/api/file/getFile' \ -H 'Authorization: Token YOUR_API_TOKEN' \ -H 'Content-Type: application/json' \ -d '{"path":"data/assets/SiYuan-Kernel"}' # Read files from mounted volumes curl -s 'http://127.0.0.1:6806/api/file/globalCopyFiles' \ -H 'Authorization: Token YOUR_API_TOKEN' \ -H 'Content-Type: application/json' \ -d '{"srcs":["/mnt/secrets/credentials.json"],"destDir":"data/assets"}' ``` ## Impact - Read arbitrary files from `/opt`, `/usr`, `/home`, `/mnt`, `/media` and any other non-denylisted path - In Docker deployments: read application source code, configs, mounted secrets - The denylist approach is fundamentally flawed — any newly added filesystem path is accessible until explicitly blocked ## Recommended Fix Switch from a denylist to an allowlist approach. Only permit copying from the workspace directory and explicitly approved external paths: ```go func IsSensitivePath(p string) bool { absPath := filepath.Clean(p) // Allowlist: only workspace and configured safe directories if strings.HasPrefix(absPath, WorkspaceDir) { // Block workspace-internal sensitive paths (conf/) if strings.HasPrefix(absPath, filepath.Join(WorkspaceDir, "conf")) { return true } return false } // Everything outside workspace is sensitive by default return true } ```

CWE-22Improper Limitation of a Pathname to a Restricted Directory (Path Traversal) (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #6OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks…
Implementation · Input Validation
Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174).
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V12.3.1 (opens in a new tab)
Attack patterns
Path Traversal (opens in a new tab)
Using Slashes and URL Encoding Combined to Bypass Validation Logic (opens in a new tab)
Manipulating Web Input to File System Calls (opens in a new tab)
Using Escaped Slashes in Alternate Encoding (opens in a new tab)
Using Slashes in Alternate Encoding (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

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Description

WeaknessesCWE-22

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