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Performance regression in v4.0 with OpenStreetMap Carto?

Status: Open.

#4571 In mapnik/mapnik;

· nrenner opened on Aug 11, 2026

Strategies to implement masking without triggering unnecessary rasterisation / complexity

compositing

renderer.agg

renderer.cairo

Status: Open.

Feature

#4566 In mapnik/mapnik;

· artemp opened on Jun 21, 2026

ScriptRun resolution bug

Status: Open.

#4564 In mapnik/mapnik;

· ramSeraph opened on Jun 19, 2026

Convoluted SVG from mapnik 4

compositing

renderer.cairo

svg

Status: Open.

Feature

#4563 In mapnik/mapnik;

· dch0ph opened on Jun 9, 2026

tiles.input - incorrect handling of un-compressed VTs

bug

input.tiles

Status: Open.

#4559 In mapnik/mapnik;

· artemp opened on May 18, 2026

Font Rendering Issues with Bracket Layers

bug

harfbuzz

Status: Open.

Bug

#4555 In mapnik/mapnik;

· artemp opened on May 8, 2026

[RFC] revert bumped dependencies from 4.0.5 release - rethink dependency/release/version practices for transient dependencies in optional components

Status: Open.

#4548 In mapnik/mapnik;

· drawks opened on Dec 30, 2025

[Bug] Excessive memory allocation in dbf_file::read_header leads to crash

Status: Open.

#4544 In mapnik/mapnik;

· oneafter opened on Dec 19, 2025

[Bug] Heap-buffer-overflow in mapnik::dbf_file::string_value within Shapefile plugin

Status: Open.

#4543 In mapnik/mapnik;

· oneafter opened on Dec 19, 2025

libmapnik.so with unmangled names for foreign function calls

Status: Open.

#4541 In mapnik/mapnik;

· pelusanchez opened on Nov 27, 2025

Issue: Support for generating vector tiles in non-Web Mercator tile schemes (EPSG:4326, EPSG:4490) using Mapnik input plugin and mapnik-vector-tile

Status: Open.

#4538 In mapnik/mapnik;

· vlv-squid opened on Nov 10, 2025

Mapnik misses proj

Status: Open.

#4534 In mapnik/mapnik;

· daryasinilo opened on Oct 31, 2025