CVE-2026-54696
Ruby JSON: JSON generator heap buffer overflow when streaming to an IO
Description
Ruby JSON is a JSON implementation for Ruby. Versions 2.9.0 through 2.19.8 are vulnerable to heap buffer overflow when the JSON generator is provided with an oversized streamed object. When streaming to an IO JSON.dump(obj, io) and JSON::State#generate(obj, io) can write past the internal JSON generator buffer when a streamed object contains an attacker-controlled string near 16 KB. Exploitation would result in a reliable process crash/denial of service. This issue has been fixed in version 2.19.9.
INFO
Published Date :
June 30, 2026, 10:05 p.m.
Last Modified :
June 30, 2026, 10:05 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-54696
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Ruby JSON gem to version 2.19.9 or later.
- Ensure proper input validation for streamed JSON data.
- Monitor system stability after applying updates.
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CVE-2026-54696 vulnerability anywhere in the article.