# PostCSS changelog

> Tool for transforming CSS with JavaScript plugins — autoprefixing, nesting, linting and the rest.

- Vendor: PostCSS
- Category: Developer Tools
- Official site: https://postcss.org
- Tracked by: What's New (https://whatsnew.fyi/product/postcss)
- Harvested from: GitHub (postcss/postcss)
- Entries below: 10 (newest first)

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

## Releases

### 8.5.26

- Date: 2026-08-06
- Version: 8.5.26
- Original notes: https://github.com/postcss/postcss/releases/tag/8.5.26
- Permalink: https://whatsnew.fyi/product/postcss/releases/8.5.26

- **fixed** — Fixed list.split() regression
- **fixed** — Track symlinks in path protection in source map loading

- Fixed `list.split()` regression (by @lazerg).
- Track symlinks in path protection in source map loading (by @drengir1).

### 8.5.25

- Date: 2026-07-29
- Version: 8.5.25
- Original notes: https://github.com/postcss/postcss/releases/tag/8.5.25
- Permalink: https://whatsnew.fyi/product/postcss/releases/8.5.25

- **fixed** — Fixed 8.5.17 visitor regression
- **fixed** — Fixed list.split() for non-string values

- Fixed 8.5.17 visitor regression.
- Fixed `list.split()` for non-string values (by @amir-rezaei).

### 8.5.24

- Date: 2026-07-28
- Version: 8.5.24
- Original notes: https://github.com/postcss/postcss/releases/tag/8.5.24
- Permalink: https://whatsnew.fyi/product/postcss/releases/8.5.24

- Preserve the BOM after the processing (by @hdimer).

### 8.5.23

- Date: 2026-07-24
- Version: 8.5.23
- Original notes: https://github.com/postcss/postcss/releases/tag/8.5.23
- Permalink: https://whatsnew.fyi/product/postcss/releases/8.5.23

- Do not load source map without `opts.from` for security reasons.

### 8.5.22

- Date: 2026-07-22
- Version: 8.5.22
- Original notes: https://github.com/postcss/postcss/releases/tag/8.5.22
- Permalink: https://whatsnew.fyi/product/postcss/releases/8.5.22

- **fixed** — Custom property losing semicolon before a comment

- Fixed custom property losing semicolon before a comment (by @sarathfrancis90).

### 8.5.21

- Date: 2026-07-21
- Version: 8.5.21
- Original notes: https://github.com/postcss/postcss/releases/tag/8.5.21
- Permalink: https://whatsnew.fyi/product/postcss/releases/8.5.21

- **fixed** — Fixed childless at-rule losing semicolon before comment

- Fixed childless at-rule losing semicolon before comment (by @sarathfrancis90).
- Fixed docs (by @isker).

### 8.5.20

- Date: 2026-07-19
- Version: 8.5.20
- Original notes: https://github.com/postcss/postcss/releases/tag/8.5.20
- Permalink: https://whatsnew.fyi/product/postcss/releases/8.5.20

- **fixed** — Fixed missing space if AtRule#params is set after
- **fixed** — Fixed mixing AST error on warnings

- Fixed missing space if `AtRule#params` is set after (by @sarathfrancis90).
- Fixed mixing AST error on warnings (by @MahinAnowar).

### 8.5.19

- Date: 2026-07-13
- Version: 8.5.19
- Original notes: https://github.com/postcss/postcss/releases/tag/8.5.19
- Permalink: https://whatsnew.fyi/product/postcss/releases/8.5.19

- Fixed cleaning `before` for new nodes inserted to `Root` (by @MahinAnowar).

### 8.5.18

- Date: 2026-07-12
- Version: 8.5.18
- Original notes: https://github.com/postcss/postcss/releases/tag/8.5.18
- Permalink: https://whatsnew.fyi/product/postcss/releases/8.5.18

- **security** — Restrict loading previous source maps file to the opts.from folder and require unsafeMap: true to disable the check

- Restricted loading previous source maps file to the `opts.from` folder for security reasons (use `unsafeMap: true` to disable the check).

### 8.5.17

- Date: 2026-07-11
- Version: 8.5.17
- Original notes: https://github.com/postcss/postcss/releases/tag/8.5.17
- Permalink: https://whatsnew.fyi/product/postcss/releases/8.5.17

- **fixed** — Fixed Maximum call stack size exceeded error
- **security** — Fixed Prototype hijacking for postcss.fromJSON()
- **fixed** — Fixed Input#origin() for unmapped end position

- Fixed `Maximum call stack size exceeded` error.
- Fixed Prototype hijacking for `postcss.fromJSON()`.
- Fixed `Input#origin()` for unmapped end position (by @chatman-media).