Integer Overflow or Wraparound Affecting ujson package, versions [5.1.0,5.12.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-UJSON-15682605
- published18 Mar 2026
- disclosed18 Mar 2026
- creditChu Yu, Ethan Kim, celeste
Introduced: 18 Mar 2026
CVE-2026-32875 (opens in a new tab)How to fix?
Upgrade ujson to version 5.12.0 or higher.
Overview
ujson is an Ultra fast JSON encoder and decoder for Python
Affected versions of this package are vulnerable to Integer Overflow or Wraparound via the indent parameter in the dumps(), dump(), or encode() functions. An attacker can cause a crash or infinite loop by supplying large or negative values for indent, leading to excessive memory allocation or unbounded processing.
Workaround
This vulnerability can be mitigated by using a fixed, non-negative, and reasonably small value for the indent parameter (below 2**31/max_recursion_depth_as_limited_by_stack_size), or by disabling indentation altogether.