TI-2026-58707 Aliases CVE-2026-85582 GHSA-gm2w-r3g5-frq5

SiYuan before v3.8.2 Unbounded Session Creation via Basic Auth

MEDIUM 64CWE-770Published 2026-09-04 · Updated 2026-09-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

SiYuan versions before v3.8.2 contain an unbounded session creation vulnerability in the publish-service Basic Auth handler that allows authenticated attackers to exhaust memory. Attackers can repeatedly authenticate with valid credentials to create persistent session entries without expiry or capacity limits, causing indefinite process memory growth and denial of service.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00436 38th percentileScored 2026-11-07

Fix Fixed siyuan (siyuan-note): 3.8.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
siyuan-note	siyuan	before 3.8.2	3.8.2	Patch available	CNA

siyuan Vendorsiyuan-note Affected before 3.8.2 Fixed in 3.8.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:b3log:siyuan::::::::	—	—	siyuan-note

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions — — ·siyuan-note

Remediation

Fix · CNA siyuan (siyuan-note) Fixed in 3.8.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-09-04
siyuan-note siyuan 3.8.2
7 records Highest priority Priority HIGH 2 HIGH, 4 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-58710 SiYuan before v3.8.2 Unbounded Memory Consumption via ControlConcurrencyPriority HIGH 77
- TI-2026-58709 SiYuan before v3.8.2 Denial of Service via Auth ThrottlePriority HIGH 77
- TI-2026-58705 SiYuan before v3.8.2 Path Guard Bypass via Case MismatchPriority MEDIUM 64
Show all 7 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-85582
2026-10-03 Alias added: GHSA-gm2w-r3g5-frq5

References

Advisory 1

GitHub Security Advisory (GHSA-f4vj-ppp2-5hg4)

TI-2026-48492 SiYuan before v3.7.3 SQL Injection via searchDocs CVSS 4.0CRITICAL 9.9
TI-2026-48491 SiYuan before v3.7.3 SQL Injection via searchEmbedBlock CVSS 4.0CRITICAL 9.9
TI-2026-48490 SiYuan before v3.7.3 SQL Injection via fullTextSearchAssetContent CVSS 4.0CRITICAL 9.9
TI-2026-47010 SiYuan before v3.7.2 Unauthenticated Administrator Takeover via MCP CVSS 4.0CRITICAL 10.0
TI-2026-26050 SiYuan has directory traversal within its publishing service CVSS 3.1CRITICAL 9.8
TI-2026-25256 SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API CVSS 3.1CRITICAL 9.8

See all 242 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences