fuzz: new parser findings 2026-07-13 by keithamus · Pull Request #1288 · csskit/csskit

keithamus · 2026-07-13T03:05:50Z

Nightly fuzz run found new findings.

We skip debug asserts to check if a dashed Ident or Function holds the atom bits for its relevant name, but we don't do that for AtRules, causing a panic when presented with a dashed AtRule.

This change refactors the debug assert to always assert on Dashed idents also, but tweaks the dashed-ident to ignore the preceeding -- so it can correctly assert on the value. This not only avoids the panic but adds extra safeguards that all ident-like functions correctly hold atom bits for their name.

Findings

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/* Specials */
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github-actions · 2026-07-14T09:06:41Z

✅ CI passed

Job	Result
Build & Test (win32-x64, win32-arm64, linux-x64, linux-arm64, darwin-x64, darwin-arm64)	✅ success
Build & Test (default features)	✅ success
Build & Test (nightly)	✅ success
Build each library	✅ success
Build benches	✅ success
Acceptance Tests	✅ success
Fuzz Corpus Replay	✅ success

## [0.0.28] - 2026-07-25 ### Other Changes - Chore(deps): update dependencies (patch) (#1300) ([#1300](#1300)) ### Css_ast - csskit_derives: Add peek(skip) attribute (#1266) ([#1266](#1266)) - Regenerate css_ast/src/values from csswg drafts (#1267) ([#1267](#1267)) - css_parse/csskit_derives: Add semantic_eq(skip) to derive(SemanticEq) (#1272) ([#1272](#1272)) - css_ast: Implement various shape functions for clip-path, etc (#1275) ([#1275](#1275)) - css_ast: Use blocks for Container & Style at rules (#1276) ([#1276](#1276)) - css_ast: Add more -moz-meter-* pseudo elements/classes (#1277) ([#1277](#1277)) - css_ast: Refactor and improve `@supports` parsing (#1278) ([#1278](#1278)) - css_ast: Implement fill & stroke (#1279) ([#1279](#1279)) - css_ast: Implement webkit-text-stroek (#1280) ([#1280](#1280)) - css_ast Implement grid functions, track, line, etc (#1281) ([#1281](#1281)) - css_ast/css_parse: Implement ToNormalisedValue trait (#1284) ([#1284](#1284)) - Regenerate css_ast/src/values from csswg drafts (#1285) ([#1285](#1285)) - Regenerate css_ast/src/values from csswg drafts (#1294) ([#1294](#1294)) - csskit_derives: Allow multiple fields to delegate metadata (#1295) ([#1295](#1295)) - css_parse: Reimplement computed value declaration peeking/parsing in DeclarationValue (#1298) ([#1298](#1298)) - css_parse: Refactor BumpBox into generic Arena allocating Box. (#1304) ([#1304](#1304)) - css_parse: Implement an Arena allocated Vec. (#1306) ([#1306](#1306)) - css_ast: Build out substitution function architecture (#1308) ([#1308](#1308)) - css_ast: Use Value/CalcableValue in most manual types (#1309) ([#1309](#1309)) ### Css_feature_data - Regenerate css_ast/src/values from csswg drafts (#1299) ([#1299](#1299)) ### Css_lexer - css_lexer/csskit: Implement LineIndex, precomputing line offsets (#1264) ([#1264](#1264)) - css_lexer: Use a boxed slice in LineIndex, dropping Bumpalo's Vec. (#1305) ([#1305](#1305)) - css_lexer: Implement fearless_simd paths for scanning (#1307) ([#1307](#1307)) ### Css_parse - fuzz: new parser findings 2026-07-13 (#1288) ([#1288](#1288)) - css_parse: Drop CursorSource trait (#1296) ([#1296](#1296)) - css_parse: Drop PreludeList, DeclarationRuleList (#1297) ([#1297](#1297)) ### Csskit - chore(deps): update dependencies (patch) (#1268) ([#1268](#1268)) ### Csskit_derives - csskit_derives: Ensure atom checks properly peek (#1282) ([#1282](#1282)) ### Csskit_spec_generator - csskit_spec_generator: Ensure property atoms includes the extra properties (#1283) ([#1283](#1283)) ### Csskit_vscode - chore(deps): update dependency @types/node to v24.13.2 (#1269) ([#1269](#1269)) - chore(deps): update dependency @types/vscode to v1.125.0 (#1270) ([#1270](#1270)) - chore(deps): update dependency typescript to v7 (#1273) ([#1273](#1273)) - chore(deps): update dependencies (patch) (#1286) ([#1286](#1286)) - chore(deps): update dependency oxlint to v1.69.0 (#1303) ([#1303](#1303)) [forcebuild]

## [0.0.28] - 2026-07-25 ### Other Changes - Chore(deps): update dependencies (patch) (#1300) ([#1300](#1300)) ### Css_ast - csskit_derives: Add peek(skip) attribute (#1266) ([#1266](#1266)) - Regenerate css_ast/src/values from csswg drafts (#1267) ([#1267](#1267)) - css_parse/csskit_derives: Add semantic_eq(skip) to derive(SemanticEq) (#1272) ([#1272](#1272)) - css_ast: Implement various shape functions for clip-path, etc (#1275) ([#1275](#1275)) - css_ast: Use blocks for Container & Style at rules (#1276) ([#1276](#1276)) - css_ast: Add more -moz-meter-* pseudo elements/classes (#1277) ([#1277](#1277)) - css_ast: Refactor and improve `@supports` parsing (#1278) ([#1278](#1278)) - css_ast: Implement fill & stroke (#1279) ([#1279](#1279)) - css_ast: Implement webkit-text-stroek (#1280) ([#1280](#1280)) - css_ast Implement grid functions, track, line, etc (#1281) ([#1281](#1281)) - css_ast/css_parse: Implement ToNormalisedValue trait (#1284) ([#1284](#1284)) - Regenerate css_ast/src/values from csswg drafts (#1285) ([#1285](#1285)) - Regenerate css_ast/src/values from csswg drafts (#1294) ([#1294](#1294)) - csskit_derives: Allow multiple fields to delegate metadata (#1295) ([#1295](#1295)) - css_parse: Reimplement computed value declaration peeking/parsing in DeclarationValue (#1298) ([#1298](#1298)) - css_parse: Refactor BumpBox into generic Arena allocating Box. (#1304) ([#1304](#1304)) - css_parse: Implement an Arena allocated Vec. (#1306) ([#1306](#1306)) - css_ast: Build out substitution function architecture (#1308) ([#1308](#1308)) - css_ast: Use Value/CalcableValue in most manual types (#1309) ([#1309](#1309)) ### Css_feature_data - Regenerate css_ast/src/values from csswg drafts (#1299) ([#1299](#1299)) ### Css_lexer - css_lexer/csskit: Implement LineIndex, precomputing line offsets (#1264) ([#1264](#1264)) - css_lexer: Use a boxed slice in LineIndex, dropping Bumpalo's Vec. (#1305) ([#1305](#1305)) - css_lexer: Implement fearless_simd paths for scanning (#1307) ([#1307](#1307)) ### Css_parse - fuzz: new parser findings 2026-07-13 (#1288) ([#1288](#1288)) - css_parse: Drop CursorSource trait (#1296) ([#1296](#1296)) - css_parse: Drop PreludeList, DeclarationRuleList (#1297) ([#1297](#1297)) ### Csskit - chore(deps): update dependencies (patch) (#1268) ([#1268](#1268)) ### Csskit_derives - csskit_derives: Ensure atom checks properly peek (#1282) ([#1282](#1282)) ### Csskit_spec_generator - csskit_spec_generator: Ensure property atoms includes the extra properties (#1283) ([#1283](#1283)) ### Csskit_vscode - chore(deps): update dependency @types/node to v24.13.2 (#1269) ([#1269](#1269)) - chore(deps): update dependency @types/vscode to v1.125.0 (#1270) ([#1270](#1270)) - chore(deps): update dependency typescript to v7 (#1273) ([#1273](#1273)) - chore(deps): update dependencies (patch) (#1286) ([#1286](#1286)) - chore(deps): update dependency oxlint to v1.69.0 (#1303) ([#1303](#1303))

fuzz: add new findings from nightly run 2026-07-13

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keithamus enabled auto-merge (squash) July 14, 2026 08:54

Fix fuzz failure

4542d71

keithamus force-pushed the fuzz/findings-20260713-030545 branch from e68f809 to 4542d71 Compare July 14, 2026 08:58

keithamus merged commit bd9459d into main Jul 14, 2026
18 of 19 checks passed

keithamus deleted the fuzz/findings-20260713-030545 branch July 14, 2026 09:06

keithamus mentioned this pull request Jul 25, 2026

Release v0.0.28 #1265

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fuzz: new parser findings 2026-07-13 - #1288

fuzz: new parser findings 2026-07-13#1288
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keithamus commented Jul 13, 2026 •

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