VulnSocial

CVE-2026-33203Disclosure(b3log / siyuan)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch b3log siyuan systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

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0.5/ 10 priority

Sources & remediation

Exploit / PoC references
Weakness type (CWE)
CWE-248CWE-306

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • siyuan

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-03-21); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
b3log
Products
siyuan

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-03-21: 1Mentions · 2026-03-24: 1Patch / Workaround · 2026-03-24: 1Technical Details · 2026-03-21: 1Technical Details · 2026-03-24: 103-2103-24
Signal classification2 categories
Disclosure
150.0%
Patch
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-03-211
Disclosure1
2026-03-241
Patch1
Full discourse2 posts
  • PulsePatch.io@pulsepatchio
    Patch

    An unauthenticated Denial of Service (DoS) vulnerability (CVE-2026-33203) affects `SiYuan` via an auth keepalive bypass. Restrict network access to mitigate until a fix is available. #SiYuan #DoS #infosec https://www.pulsepatch.io/posts/cve-2026-33203-siyuan-websocket-dos

    Post summary

    The post reports an unauthenticated DoS flaw in SiYuan (CVE-2026-33203) caused by an auth keepalive bypass, advising users to restrict network access until vendor patch arrives.

    0000024
    2 followersView on X
  • CVE@CVEnew
    Disclosure

    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… https://www.cve.org/CVERecord?id=CVE-2026-33203

    Post summary

    CVE-2026-33203 discloses an authentication bypass in SiYuan’s WebSocket server before version 3.6.2, allowing unauthenticated connections.

    00000141
    56.8K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appb3logsiyuan---

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