CVE-2026-56812
unknown
CVSS v3
—
CVSS v4 NEW
6.3
VIR risk
—
Description
Phoenix JavaScript presence client crashes on presence keys colliding with Object.prototype members in Presence.syncState/syncDiff
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Hex | phoenix | >=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,<1.8.9 | 1.5.15 |
References
- https://cna.erlef.org/cves/CVE-2026-56812.html
- https://github.com/phoenixframework/phoenix/commit/7f7b971c1ea0994e3fbd1c11ddb05e780bd38ad8
- https://github.com/phoenixframework/phoenix/commit/89a1c4be161e436241e12b2378a719904b9bd96f
- https://github.com/phoenixframework/phoenix/commit/b90b22521465ece00eb5a19d5aa2b9465b209c85
- https://github.com/phoenixframework/phoenix/commit/beffc4da1e787e572121f68902c63daf4fe7d9c2
- https://github.com/phoenixframework/phoenix/security/advisories/GHSA-63mc-hw7g-86rr
- https://osv.dev/vulnerability/EEF-CVE-2026-56812
- https://hex.pm/packages/phoenix
- https://www.npmjs.com/package/phoenix
CWEs
CWE-754
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.