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  4. CVE 2026 102356 kroki mermaid companion ssrf via flowchart image
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Back to active CVEs
Medium · CVSS 5.0CVE-2026-102356

Kroki Mermaid companion SSRF via flowchart image URLsCVE-2026-102356

Answer in brief

CVE-2026-102356 records a Medium severity (CVSS 5.0) vulnerability in Kroki Mermaid companion SSRF via flowchart image URLs. The current sources do not mark it as known exploited. The current feed maps yuzutech/kroki (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 6, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Nov 6, 2026Material review Nov 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.0
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps yuzutech/kroki (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
yuzutech/krokigeneric>=0.26.0 <0.31.20.31.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for yuzutech/kroki.
  2. 2Review the reported fix. Update yuzutech/kroki to 0.31.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Kroki creates diagrams from textual descriptions. From 0.26.0 until 0.31.2, the optional Mermaid companion's mermaid/src/worker.js renders attacker-controlled flowchart image nodes in headless Chromium without a network request policy, even when KROKI_SAFE_MODE is set to secure. An actor who can submit Mermaid source and satisfy any authentication or authorization configured by the deployment can cause the companion to issue HTTP or HTTPS GET requests when requesting PNG output. Exploitation requires the Mermaid companion, PNG rendering through its headless Chromium process, a diagram-submission path available to the actor, and network reachability from the companion to the target. The demonstrated impact is limited to blind request reachability and possible state-changing GET endpoints; response exfiltration, cloud metadata access, port scanning, and access beyond the companion's network reachability are not established. This issue is fixed in version 0.31.2.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Kroki: TikZ Secure Mode Local File Read via LaTeX File I/O PrimitivesSame yuzutech/kroki package
  • ERPNext OCR 1.1.1 Path Traversal and SSRF via read_documentAlso CWE-918
  • RAGFlow < 0.27.0 SSRF via set_api_key base_url ParameterAlso CWE-918
  • Dify < 1.15.0 SSRF Protection Bypass via Remote-Files EndpointsAlso CWE-918
  • FreeScout: Server-side request forgery via incomplete outbound host validation and unguarded download sinksAlso CWE-918

Record context

Vulnerability class
SSRF
EPSS
Not reported
CWE IDs
CWE-918
Source
CVE List V5
Source checked
Nov 6, 2026
References
3 linked sources
Open source record