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CVE-2026-129485— Kroki before 0.36.0 SSRF via BlockDiag Icon and Background Attributes

Quick assessment

Affected
yuzutech kroki
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kroki 在 0.36.0 版本之前存在一个服务器端请求伪造（SSRF）漏洞，该漏洞存在于 BlockDiag 系列引擎中。未经身份验证的攻击者可以利用节点图标（node icon）和背景（background）属性，诱使服务器发起请求。 攻击者可以通过向 POST /blockdiag/svg 或其同类端点发送精心构造的图表数据，来探测内部服务或云元数据接口，并读取服务器上的本地图片文件。

CVSS 5.8 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
yuzutech kroki < 0.36.0 affected
0.36.0 unaffected
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I. Basic Information for CVE-2026-129485

Vulnerability Information
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Vulnerability Title
Kroki before 0.36.0 SSRF via BlockDiag Icon and Background Attributes
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
yuzutech kroki 0 ~ 0.36.0 -

II. Public POCs for CVE-2026-129485

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-129485

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Patches & Fixes for CVE-2026-129485 (1)

Vendor Advisories for CVE-2026-129485 (2)

Vendor Pages for CVE-2026-129485 (1)

Other References for CVE-2026-129485 (1)

IV. Related Vulnerabilities

Same product: kroki
Same vendor: yuzutech
Same weakness: CWE-918