CVE-2026-74799Public exploitNetwork attack vectorHinoki check available

Secret disclosure via unauthenticated pprof endpoints

Published Aug 17, 2026 · Updated Aug 17, 2026

Information disclosure in SiYuan before 3.7.4 allows remote attackers to read in-memory secrets via exposed /debug/pprof endpoints. The serveDebug() function mounts Go net/http/pprof handlers on the main gin engine with no model.CheckAuth or other authentication middleware, and it suppresses them only when --mode is exactly prod. Exposure requires the service to start with --mode set to dev or any other non-prod value; once reachable, heap and goroutine dumps can reveal AccessAuthCode, AI provider API keys, and other live process data.

CVSS severity9.2
Critical
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Information disclosure in SiYuan before 3.7.4 allows remote attackers to read in-memory secrets via exposed /debug/pprof endpoints. The serveDebug() function mounts Go net/http/pprof handlers on the main gin engine with no model.CheckAuth or other authentication middleware, and it suppresses them only when --mode is exactly prod. Exposure requires the service to start with --mode set to dev or any other non-prod value; once reachable, heap and goroutine dumps can reveal AccessAuthCode, AI provider API keys, and other live process data.

The record

CVE
CVE-2026-74799
Published
Aug 17, 2026
Updated
Aug 17, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-215, T1190, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.7.4

Published CVSS scores

9.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:L/SC:H/SI:N/SA:L
9.3VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-215Insertion of Sensitive Information Into Debugging Code
T1190Exploit Public-Facing Application
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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