CVE detail
CVE-2026-32874
UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.4.0 through 5.11.0 contain an accumulating memory leak in JSON parsing large (outside of the range [-2^63, 2^64 - 1]) integers. The leaked memory is a copy of the string form of the integer plus an additional NULL byte. The leak occurs irrespective of whether the integer parses successfully or is rejected due to having more than sys.get_int_max_str_digits() digits, meaning that any sized leak per malicious JSON can be achieved provided that there is no limit on the overall size of the payload. Any service that calls ujson.load()/ujson.loads()/ujson.decode() on untrusted inputs is affected and vulnerable to denial of service attacks. This issue has been fixed in version 5.12.0.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 19.5 · diversity 13.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
6 source links · newest first
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32874.jsonsecurity.access.redhat.com
No excerpt available.
Vendor Advisorysecurity.access.redhat.comMar 20, 2026, 2:16 AM - https://bugzilla.redhat.com/show_bug.cgi?id=2449411bugzilla.redhat.com
No excerpt available.
Exploitbugzilla.redhat.comMar 20, 2026, 2:16 AM - https://access.redhat.com/security/cve/CVE-2026-32874access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 20, 2026, 2:16 AM No excerpt available.
Exploitgithub.comMar 20, 2026, 2:16 AMNo excerpt available.
Exploitgithub.comMar 20, 2026, 2:16 AMNo excerpt available.
Exploitgithub.comMar 20, 2026, 2:16 AM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
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