CVE-2026-129485
Kroki before 0.36.0 SSRF via BlockDiag Icon and Background Attributes
Description
Kroki 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.
INFO
Published Date :
Nov. 15, 2026, 4:16 p.m.
Last Modified :
Nov. 15, 2026, 4:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Kroki to version 0.36.0 or later.
- Ensure all BlockDiag engines are updated.
- Validate diagram inputs for safety.
- Restrict network access to Kroki.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-129485.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-129485 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-129485
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-129485 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-129485 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Nov. 15, 2026
Action Type Old Value New Value Added Description Kroki 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N Added CWE CWE-918 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/129xxx/CVE-2026-129485.json">CVE-2026-129485</a> Added Reference https://github.com/yuzutech/kroki/blob/v0.35.0/server/src/main/java/io/kroki/server/service/Blockdiag.java#L64-L85 Added Reference https://github.com/yuzutech/kroki/commit/becd3b4a86754cb08d0fe54f65e92a6cab542409 Added Reference https://github.com/yuzutech/kroki/releases/tag/v0.36.0 Added Reference https://github.com/yuzutech/kroki/security/advisories/GHSA-jwh8-j584-79hp Added Reference https://www.vulncheck.com/advisories/kroki-before-0.36.0-ssrf-via-blockdiag-icon-and-background-attributes