CVE-2026-109310

6.5Medium

Published 12 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

6.5Medium

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: High impact on availability
Weakness: CWE-770

Impact

Attackers can crash the server by triggering an OOM-kill with a single HTTP request. An attacker needs publish reader access, or unauthenticated network access if publish authentication is disabled.

Root cause

The /api/icon/getDynamicIcon endpoint evaluates Sprig templates without restricting functions like 'until', allowing uncontrolled memory allocation.

Affected systems

SiYuan v3.1.12 before v3.8.6

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Fix & remediation

Upgrade SiYuan to version v3.8.6 or later. If patching immediately is not possible, enable publish authentication or block access to the /api/icon/getDynamicIcon endpoint at the reverse proxy.

shell

$ docker pull b3log/siyuan:v3.8.6

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

SiYuan v3.1.12 before v3.8.6 fails to restrict the Sprig template function map in the /api/icon/getDynamicIcon content parameter, allowing resource exhaustion. A publish reader, or anyone when publish auth is disabled, can use uncapped functions like until to OOM-kill the kernel with one request.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109310