CVE-2026-85582 SiYuan before v3.8.2 Unbounded Session Creation via Basic Auth
Authenticated attackers can exhaust memory by creating unlimited sessions via Basic Auth, causing denial of service in SiYuan.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85582?
CVE-2026-85582 is a high-severity denial of service vulnerability in siyuan-note siyuan, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2026-85582?
How do I fix CVE-2026-85582?
No fix has been published for CVE-2026-85582 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-85582 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85582 exists.
Sources
Also known as GHSA-f4vj-ppp2-5hg4, GHSA-gm2w-r3g5-frq5.