CVE-2026-54911 · cross-distro fix matrix

CVE-2026-54911: UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Prior to 5.13.0, ujson.dumps() (or ujson.dump() or ujson.encode()) have a reject_bytes=False option. When

Affects 1 Linux release across 1 (distro × package) combinations. First disclosed: 2026-06-22.

CVSS v3:MEDIUM · 6.5(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-54911 has a known fix. Run the listed command on that distro to remediate.

Alpine edge

Source: Alpine secdb

py3-ujson→ fixed in5.13.0-r0

apk update && apk add --upgrade py3-ujson

Are YOU affected by CVE-2026-54911?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

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