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CVE-2026-33203

SiYuan is a personal knowledge management system. Prior to version 3.6.2, the SiYuan kernel WebSocket server accepts unauthenticated connections when a specific "auth keepalive" query parameter is present. After connection, incoming messages are parsed using unchecked type assertions on attacker-controlled JSON. A remote attacker can send malformed messages that trigger a runtime panic, potentially crashing the kernel process and causing denial of service. Version 3.6.2 fixes the issue.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0ad53e22e497088ca4cde8d945821d72096b211fe7a2770b04aba5545b5ca92e
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9f2ffd9d1f3cccb4196cb4243ea19d3f56e00ee31113adb8151af2559d844536 · sha256:bef17f404a99fd9f… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9f2ffd9d1f3cccb4196cb4243ea19d3f56e00ee31113adb8151af2559d844536 · sha256:bef17f404a99fd9f… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"siyuan","vendor":"siyuan-note","versions":[{"status":"affected","version":"< 3.6.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9f2ffd9d1f3cccb4196cb4243ea19d3f56e00ee31113adb8151af2559d844536 · sha256:bef17f404a99fd9f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9f2ffd9d1f3cccb4196cb4243ea19d3f56e00ee31113adb8151af2559d844536 · sha256:bef17f404a99fd9f… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9f2ffd9d1f3cccb4196cb4243ea19d3f56e00ee31113adb8151af2559d844536 · sha256:bef17f404a99fd9f… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9f2ffd9d1f3cccb4196cb4243ea19d3f56e00ee31113adb8151af2559d844536 · sha256:bef17f404a99fd9f… · /containers/cna/problemTypes/1/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3g9h-9hp4-654v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3g9h-9hp4-654v"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9f2ffd9d1f3cccb4196cb4243ea19d3f56e00ee31113adb8151af2559d844536 · sha256:bef17f404a99fd9f… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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