Sourced from lxml's changelog.

6.0.3 (2026-04-09)

Bugs fixed

• Several out of memory error cases now raise MemoryError that were not handled before.

• Slicing with large step values (outside of +/- sys.maxsize) could trigger undefined C behaviour.

• LP#2125399: Some failing tests were fixed or disabled in PyPy.

• LP#2138421: Memory leak in error cases when setting the public_id or system_url of a document.

• Memory leak in case of a memory allocation failure when copying document subtrees.

• When mapping an XPath result to Python failed, the result memory could leak.

• When preparing an XSLT transform failed, the XSLT parameter memory could leak.

Other changes

• Built using Cython 3.2.4.

• Binary wheels use zlib 1.3.2.

• 973d059 Update changelog.
• 9044a52 Build: Downgrade libiconv to 1.18 since 1.19 does not build reliably.
• a34dfdd Build: Upgrade libiconv to 1.19.
• 4cbf1df Build: Validate hash digest of downloaded library archives.
• ab0e775 Prepare release of 6.0.3.
• 96844d2 Fix typos and grammar errors across documentation (GH-489)
• 6a90cc6 More accurate instruction for pip install. (GH-493)
• b8b8337 Build: Upgrade Cython to 3.2.4.
• 053a7f2 Update changelog.
• 2fbda6d Build: Upgrade zlib from 1.3.1 to security fixed 1.3.2.
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