SiYuan before v3.8.2 Unbounded Session Creation via Basic Auth
Published Sep 4, 2026
7.1
HIGHCVSS 4.0
EPSS 0.44%
Description
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.
Affected products
-
- Version 0StatusaffectedConstraints<3.8.2
- Version 3.8.2StatusunaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siyuan-Note | Siyuan | unaffected |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Sep 4, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Sep–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.44% (0.00436) | 35.62th | v5 (v2026.06.15) |
| Sep 5, 2026 | 0.37% (0.00371) | 30.09th | v5 (v2026.06.15) |
References (2)
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f4vj-ppp2-5hg4 exploitvendor-advisory
- https://www.vulncheck.com/advisories/siyuan-before-3.8.2-unbounded-session-creation-via-basic-auth third-party-advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f4vj-ppp2-5hg4 | exploitvendor-advisory | |
| https://www.vulncheck.com/advisories/siyuan-before-3.8.2-unbounded-session-creation-via-basic-auth | third-party-advisory |
Change history (0)
No recorded changes yet.