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Sanitize palette colors before they reach generated CSS - #8234
juneja-varun wants to merge 1 commit into
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe change adds ChangesPalette CSS sanitization
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to Palette values are checked before interpolation into diagram CSS, preventing them from changing CSS structure. No material issue is established, so the change appears mergeable subject to normal checks. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@packages/mermaid/src/diagrams/common/colorThemeGate.ts`:
- Line 64: Update SAFE_COLOR to accept only CSS-valid hexadecimal lengths—3, 4,
6, or 8 digits—while preserving the existing named and functional color formats.
Add regression coverage through safeColor for invalid 5- and 7-digit hexadecimal
values, ensuring they return currentColor.
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.changeset/palette-css-safe-color.mdpackages/mermaid/src/diagrams/block/styles.tspackages/mermaid/src/diagrams/class/styles.jspackages/mermaid/src/diagrams/common/colorThemeGate.spec.tspackages/mermaid/src/diagrams/common/colorThemeGate.tspackages/mermaid/src/diagrams/er/styles.tspackages/mermaid/src/diagrams/flowchart/styles.tspackages/mermaid/src/diagrams/git/styles.jspackages/mermaid/src/diagrams/requirement/styles.jspackages/mermaid/src/diagrams/timeline/styles.jspackages/mermaid/src/diagrams/usecase/styles.ts
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## develop #8234 +/- ##
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+ Coverage 80.13% 81.17% +1.04%
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Files 624 621 -3
Lines 85311 85894 +583
Branches 16183 18982 +2799
===========================================
+ Hits 68366 69728 +1362
+ Misses 15909 15159 -750
+ Partials 1036 1007 -29
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Heads up: Argos is flagging one visual snapshot diff pending approval. Everything else (unit tests, e2e, lint, types) is green — I can't approve/reject the new baseline myself since that needs repo access, so flagging it here for whoever reviews. |
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Relates to #8184.
I went to fix the reachability described in that issue (a diagram-text-controlled
themeVariables.borderColorArrayclosing a CSS declaration early), but couldn't actually get it to happen on currentdevelop- I've written up why on the issue itself.sanitizeDirectivealready stripsborderColorArray/bkgColorArrayfrom both frontmatter and%%{init}%%config before it reaches the theme, since they aren't inconfigKeys.Even so, the interpolation sites themselves have no defense of their own - the only thing standing between diagram text and this class of injection is that one allowlist check, several layers upstream of where the actual interpolation happens.
lookalready gets this treatment viasafeLook; the colour arrays never did. AddedsafeColornext to it and applied it everywhere a palette entry reaches a CSS declaration, across all 8 style modules that carry a palette.Verified with the real config pipeline (
preprocessDiagram→configApi.addDirective) that a malicious payload doesn't survive today either way, and added unit tests forsafeColoralongside the existingsafeLookones.Summary
safeColorto validate palette colors and provide safe fallbacks.safeColoracross eight diagram style modules before CSS interpolation.mermaidpackage.