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Do not throw in contains() for an empty array reference token

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json_pointer::contains() rejected malformed array indices, but an empty
reference token (e.g. "/a/" where "a" is an array, or "/" on an array)
passed every check and reached array_index(), which throws
out_of_range.404. contains() must not throw (cf. #5395), so it now
returns false for an empty token. at() still throws out_of_range.404.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-29 06:37:09 +02:00
parent 633de8e44b
commit c1945cb8d5
3 changed files with 32 additions and 0 deletions
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single_include/nlohmann/json.hpp
+6
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@@ -19588,6 +19588,12 @@ class json_pointer
// "-" always fails the range check
return false;
}
if (JSON_HEDLEY_UNLIKELY(reference_token.empty()))
{
// an empty reference token is not an array index; array_index()
// would throw out_of_range.404 -- contains() must not throw (see #5395)
return false;
}
if (JSON_HEDLEY_UNLIKELY(reference_token.size() == 1 && !("0" <= reference_token && reference_token <= "9")))
{
// invalid char