CVE-2026-85175 SiYuan before v3.8.2 TLS Private Key Disclosure via getFile

What is CVE-2026-85175?

CVE-2026-85175 is a high-severity vulnerability in siyuan-note siyuan, published on 3 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

SiYuan versions <= 3.8.1 (fixed in v3.8.2) contain an incomplete blocklist in the IsForbiddenAbsPath() function (kernel/util/path_guard.go), which only blocks conf/conf.json by exact match and does not restrict the TLS private key (conf/key.pem) or CA private key (conf/ca.key) stored in the same conf/ directory. Because the getFile handler skips the blocklist for RoleAdministrator and all authenticated users receive RoleAdministrator in v3.8.1, any user (or any client on a default no-auth-code instance) can retrieve these private keys via POST /api/file/getFile. On deployments with TLS enabled, this allows decryption of captured HTTPS traffic (key.pem) and forging of certificates trusted by clients that imported SiYuan's CA (ca.key).

Weakness: CWE-552

Which versions are affected by CVE-2026-85175?

3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel.

How do I fix CVE-2026-85175?

Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260819144130-256d73aa7f94 or later.

Is CVE-2026-85175 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85175 exists.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-4wwp-f6gw-6qm5, GHSA-gg9w-4vv2-vjcm, GO-2026-6663.