PT-2026-8010 · Pypi · Beautiful-Mermaid

Willdollman · Published 2026-02-13 · Updated 2026-02-17 · CVE-2026-26226

Positive Technologies (AI Summary)

CVSS v4.0

5.3

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Name of the Vulnerable Software and Affected Versions beautiful-mermaid versions prior to 0.1.3

Description The software contains an SVG attribute injection issue that can lead to cross-site scripting (XSS) when rendering attacker-controlled Mermaid diagrams. User-controlled values from Mermaid style and classDef directives are interpolated into SVG attribute values without proper escaping. This allows crafted input to break out of an attribute context and inject arbitrary SVG elements/attributes into the rendered output. When the generated SVG is embedded in a web page, this can result in script execution in the context of the embedding origin.

Recommendations Update beautiful-mermaid to version 0.1.3 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-26226

GHSA-CGMM-X5WW-Q5CR

Affected Products

Beautiful-Mermaid

References · 15

• 🔥 https://neo.projectdiscovery.io/share/cec71dc7-a8eb-417e-b8b4-666644796c1e · Exploit
• https://github.com/lukilabs/beautiful-mermaid/releases/tag/v0.1.3 · Patch
• https://osv.dev/vulnerability/GHSA-cgmm-x5ww-q5cr · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-26226 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-26226 · Security Note
• https://github.com/lukilabs/beautiful-mermaid · Note
• https://github.com/lukilabs/beautiful-mermaid/commit/68f3ab8c9658e7f4a3b749e06a6b96e4c3f55db1 · Note
• https://github.com/lukilabs/beautiful-mermaid/pull/8 · Note
• https://reddit.com/r/VulnMatter/comments/1r6af72/resumen_diario_de_vulnerabilidades_16022026 · Reddit Post
• https://twitter.com/CVEnew/status/2022362796214636885 · Twitter Post
• https://reddit.com/r/VulnMatter/comments/1r6af6d/resumen_diario_de_vulnerabilidades_16022026 · Reddit Post
• https://twitter.com/VulmonFeeds/status/2022366337692061799 · Twitter Post
• https://twitter.com/_cvereports/status/2022689905755742475 · Twitter Post
• https://reddit.com/r/VulnMatter/comments/1r75ll4/resumen_diario_de_vulnerabilidades_17022026 · Reddit Post
• https://vulncheck.com/advisories/beautiful-mermaid-svg-attribute-injection · Note