# nginx release-1.31.4

- Product: nginx (https://whatsnew.fyi/product/nginx)
- Vendor: F5
- Date: 2026-08-19
- Version: release-1.31.4
- Original notes: https://github.com/nginx/nginx/releases/tag/release-1.31.4
- Permalink: https://whatsnew.fyi/product/nginx/releases/release-1.31.4

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'.

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- **fixed** — Xslt: xmlCreatePushParserCtxt() error handling
- **fixed** — Image filter: bounded size parser reads by received data
- **changed** — Updated security policy report methods
- **changed** — Autoindex: use temporary pool for directory entries
- **fixed** — Perl: fixed $r->print() zero copy with mutable scalars
- **fixed** — Events: validate descriptor before FD_SET()
- **fixed** — Format specifier fixes in error logging
- **fixed** — QUIC: apply stream flow control to RESET_STREAM final_size
- **changed** — Script: improved compatibility of complex value codes
- **changed** — gRPC: narrowed special handling of "trailer only" responses
- **fixed** — Fixed overflow detection in chunked parser
- **changed** — Upstream: special handling of the "Host" header in HTTP and gRPC
- **fixed** — Upstream: reject zero WINDOW_UPDATE increments
- **added** — Core: added data model and JSON serialization libraries
- **fixed** — Upstream: fixed MSVC compilation
- **changed** — Upstream: reserved padding in state structures
- **added** — Stream: PROXY protocol version 2 upstream write support

[nginx-1.31.4](https://nginx.org/en/download.html) mainline version has been released.

See official [CHANGES](https://nginx.org/en/CHANGES) on nginx.org.

Below is a release summary generated by GitHub.

##### What's Changed
* Xslt: xmlCreatePushParserCtxt() error handling by @VadimZhestikov in https://github.com/nginx/nginx/pull/1565
* Image filter: bounded size parser reads by received data by @VadimZhestikov in https://github.com/nginx/nginx/pull/1574
* Updated security policy report methods by @pluknet in https://github.com/nginx/nginx/pull/1586
* Autoindex: use temporary pool for directory entries by @Srujan-rai in https://github.com/nginx/nginx/pull/1311
* Perl: fixed $r->print() zero copy with mutable scalars by @devnexen in https://github.com/nginx/nginx/pull/1581
* Events: validate descriptor before FD_SET() by @sbhowmikf5 in https://github.com/nginx/nginx/pull/1598
* Format specifier fixes in error logging by @nishat-06 in https://github.com/nginx/nginx/pull/1592
* GH: restrict the mark_stale job to nginx/nginx by @aminvakil in https://github.com/nginx/nginx/pull/1605
* QUIC: apply stream flow control to RESET_STREAM final_size by @arut in https://github.com/nginx/nginx/pull/1612
* Script: improved compatibility of complex value codes by @bavshin-f5 in https://github.com/nginx/nginx/pull/1601
* gRPC: narrowed special handling of "trailer only" responses by @vinaykumar-1591 in https://github.com/nginx/nginx/pull/1591
* Fixed overflow detection in chunked parser by @pluknet in https://github.com/nginx/nginx/pull/1625
* Upstream: special handling of the "Host" header in HTTP and gRPC by @arut in https://github.com/nginx/nginx/pull/1593
* Upstream: reject zero `WINDOW_UPDATE` increments by @felix314159 in https://github.com/nginx/nginx/pull/1622
* Core: added data model and JSON serialization libraries by @hyuan-netizen in https://github.com/nginx/nginx/pull/1569
* Upstream: fixed MSVC compilation after dea68dbf126f by @VadimZhestikov in https://github.com/nginx/nginx/pull/1635
* Upstream: reserved padding in state structures. by @dplotnikov-f5 in https://github.com/nginx/nginx/pull/1631
* Stream: PROXY protocol version 2 upstream write support by @VadimZhestikov in https://github.com/nginx/nginx/pull/1204

##### New Contributors
* @Srujan-rai made their first contribution in https://github.com/nginx/nginx/pull/1311
* @nishat-06 made their first contribution in https://github.com/nginx/nginx/pull/1592
* @aminvakil made their first contribution in https://github.com/nginx/nginx/pull/1605
* @felix314159 made their first contribution in https://github.com/nginx/nginx/pull/1622

**Full Changelog**: https://github.com/nginx/nginx/compare/release-1.31.3...release-1.31.4