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Phoenix: Presence keys colliding with `Object.prototype` members break existence checks

🗓️ 03 Sep 2026 20:30:33Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 5 Views

Phoenix presence client: Object.prototype key collision in existence check causes TypeError DoS.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB		CVE-2026-56812
7 Jul 202615:22
–attackerkb
circl
Circl		CVE-2026-56812
3 Sep 202622:35
–circl
cve
CVE		CVE-2026-56812
7 Jul 202615:22
–cve
cvelist
Cvelist		CVE-2026-56812 Phoenix JavaScript presence client crashes on presence keys colliding with Object.prototype members in Presence.syncState/syncDiff
7 Jul 202615:22
–cvelist
euvd
EUVD		EUVD-2026-42050
3 Sep 202620:30
–euvd
nvd
NVD		CVE-2026-56812
7 Jul 202616:16
–nvd
osv
OSV		CVE-2026-56812 Phoenix JavaScript presence client crashes on presence keys colliding with Object.prototype members in Presence.syncState/syncDiff
7 Jul 202615:22
–osv
osv
OSV		EEF-CVE-2026-56812 Phoenix JavaScript presence client crashes on presence keys colliding with Object.prototype members in Presence.syncState/syncDiff
7 Jul 202615:22
–osv
osv
OSV		GHSA-63MC-HW7G-86RR Phoenix: Presence keys colliding with `Object.prototype` members break existence checks
3 Sep 202620:30
–osv
patchstack
Patchstack		NPM: Phoenix: Presence keys colliding with `Object.prototype` members break existence checks
3 Sep 202620:30
–patchstack
Rows per page
Vulners
Node
OR
phoenix_evolutionphoenix_evolution_cmsRange1.8.0-rc.0–1.8.9npm
phoenix_evolutionphoenix_evolution_cmsRange1.7.0-rc.0–1.7.24npm
phoenix_evolutionphoenix_evolution_cmsRange1.6.0-rc.0–1.6.17npm
phoenix_evolutionphoenix_evolution_cmsRange1.2.0-rc.0–1.5.15npm
phoenix_evolutionphoenix_evolution_cmsRange1.8.0-rc.0–1.8.9erlang
phoenix_evolutionphoenix_evolution_cmsRange1.7.0-rc.0–1.7.24erlang
phoenix_evolutionphoenix_evolution_cmsRange1.6.0-rc.0–1.6.17erlang
phoenix_evolutionphoenix_evolution_cmsRange1.2.0-rc.0–1.5.15erlang

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03 Sep 2026 20:30Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.17.5
CVSS 46.3
EPSS0.00778
SSVC
CWE-754
Phoenixpresence clientObject.prototypeTypeErrordenial of servicetruthiness check
5