EUVD-2026-71007
GHSA-f2hr-7qxv-2pwm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Remote unauthenticated network attack requiring no complexity; sole impact is availability via memory exhaustion with no confidentiality or integrity effect.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
SiYuan versions before v3.8.2 contain a denial of service vulnerability in the publish-service Basic Auth throttle that stores failed-attempt state using attacker-controlled usernames without enforcing capacity limits or eviction policies. Unauthenticated attackers can submit repeated authentication requests with unique invalid usernames to exhaust memory and increase synchronization overhead, degrading service availability.
AnalysisAI
Memory exhaustion denial-of-service in SiYuan's publish-service Basic Auth throttle allows unauthenticated remote attackers to crash or degrade the service by submitting authentication requests with an unbounded number of unique invalid usernames. Because the throttle tracks per-username failure state in memory with no capacity limit or eviction policy, the in-memory tracking structure grows without bound until the process exhausts available heap. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The SiYuan publish-service must be enabled and network-reachable by the attacker; this service is not a default-on component in all deployment configurations, so instances where publish-service is disabled or firewalled off are not directly exposed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) reflects a remotely exploitable, low-complexity attack requiring no privileges or user interaction - the most favorable attack surface for an adversary. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade SiYuan to v3.8.2 or later, which resolves the unbounded memory accumulation in the publish-service Basic Auth throttle; the fix is documented in GitHub Security Advisory GHSA-2x7j-p79w-7744. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running SiYuan versions prior to v3.8.2 and assess whether the publish-service is exposed to untrusted networks or the internet. …
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External POC / Exploit Code
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