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Advisory record · GHSA-63mc-hw7g-86rr

Phoenix JavaScript presence client crashes on presence keys colliding with Object.prototype members in Presence.syncState/syncDiff

CVSS 6.3 MediumEPSS 0.0080 · 56th percentile

Published by the GitHub Advisory Database at 7 Jul 2026, 15:22 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
phoenixHex>=1.2.0-rc.0, <1.5.15 || >=1.6.0-rc.0, <1.6.17 || >=1.7.0-rc.0, <1.7.24 || >=1.8.0-rc.0, <1.8.91.5.15, 1.6.17, 1.7.24, 1.8.9
phoenixnpm>=1.2.0-rc.0, <1.5.15 || >=1.6.0-rc.0, <1.6.17 || >=1.7.0-rc.0, <1.7.24 || >=1.8.0-rc.0, <1.8.91.5.15, 1.6.17, 1.7.24, 1.8.9
Identifiers
GHSA-63mc-hw7g-86rr · CVE-2026-56812 · EEF-CVE-2026-56812
Weakness (CWE)
CWE-754
Tags
Published
7 Jul 2026
Updated
24 Sept 2026

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (EEF)
  • CISA KEV Not listed.
  • EPSS 0.0080, the 56th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 7 Jul 2026. New records show when each source confirmed them.

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.