OCaml 5.5.2 released!

[NewsBot]

OCaml 5.5.2 has been released.

This patch release contains several security fixes:

• Security fix OSEC-2026-21: Str.string_partial_match
• Security fix OSEC-2026-22: potential overflow in data file inUnix.map_file
• Security fix OSEC-2026-23: multiple issues in demarshaling
• Security fix OSEC 2026-24: multiple issues in command quoting on Windows
• Security fixOSEC-2026-25: runtime events library, harden decoding of events
• Security fix OSEC-2026-26: runtime events library, maintain custom events cache integrity.

and four other safe and useful bugfixes

• two miscompilation: with atomic loads, the other with immediate range patterns
• macOS configuration: fix detection of function available in future versions
• runtime events library, fix an infinite loop with user events

See detailed list of changes.

Link: Release OCaml 5.5.2 · ocaml/ocaml · GitHub