Niels Lohmann 2ea6d8c127 Require the found key to equal the looked-up key when comparing objects (#5720) ...

For an object type whose comparator treats unequal keys as equivalent
(for example a std::map with a case-insensitive comparator),
compare_iteratively() looked up a mismatched left key in the right
object with find(), which uses the object's own comparator, and
accepted whatever entry it found without checking that the keys are
actually equal. A case-insensitive comparator then found "KEY" for
"key", so two objects nested past the recursion bound (or at every
depth with JSON_NO_THREAD_LOCAL) could compare equal even though the
object type's own operator== - and basic_json itself, below the bound
- consider them different.

Accept the found entry only if its key equals (not just compares
equivalent to) the looked-up key.

Fixes #5655.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

2026-09-30 20:07:56 +02:00

..

json_fwd.hpp

Make JSON_STRICT_NUL_HANDLING part of the ABI tag (#5560)

2026-09-25 21:54:11 +02:00

json.hpp

Require the found key to equal the looked-up key when comparing objects (#5720)

2026-09-30 20:07:56 +02:00