Kroki before 0.36.0 SSRF via BlockDiag Icon and Background Attributes

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-129485
StatePUBLISHED
AssignerVulnCheck
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-15 16:16:56 UTC
Updated2026-11-15 16:16:56 UTC
DescriptionKroki before 0.36.0 contains a server-side request forgery vulnerability in the BlockDiag family of engines that allows unauthenticated attackers to make server requests via node icon and background attributes. Attackers can send crafted diagrams to POST /blockdiag/svg or sibling endpoints to query internal services or cloud metadata and read local image files from the server.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-918 | CWE-918 Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/C...
4.0CNACVSS6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
3.1[email protected]Primary5.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
3.1CNACVSS5.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Sub Conf.
Low
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Yuzutech Kroki affected 0.36.0 semver Not specified
CNA Yuzutech Kroki unaffected 0.36.0 semver Not specified

References

ReferenceSourceLinkTags
www.vulncheck.com/advisories/kroki-before-0.36.0-ssrf-via-blockdiag-icon-and-ba... [email protected] www.vulncheck.com
github.com/yuzutech/kroki/security/advisories/GHSA-jwh8-j584-79hp [email protected] github.com
github.com/yuzutech/kroki/releases/tag/v0.36.0 [email protected] github.com
github.com/yuzutech/kroki/commit/becd3b4a86754cb08d0fe54f65e92a6cab542409 [email protected] github.com
github.com/yuzutech/kroki/blob/v0.35.0/server/src/main/java/io/kroki/ser... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: oceanwarranty (Adgepuk Research) (en)

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