Widely used Elixir Plug library; DoS could disrupt Phoenix-based services across organizations.
CVE-2026-54892
Unauthenticated DoS via nested query decoding in Plug (Elixir).
Is CVE-2026-54892 being exploited?
Not confirmed. CVE-2026-54892 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.95% probability of exploitation in the next 30 days.
How severe is CVE-2026-54892?
CVE-2026-54892 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-54892?
Yes. A fix has been recorded for CVE-2026-54892. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-54892 affect?
CVE-2026-54892 affects Plug library (Elixir) versions 1.15.0–1.15.4, 1.16.4, 1.17.2, 1.18.3, 1.19.3. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-54892?
Upgrade Plug to fixed version (>= 1.15.5).
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated DoS via deeply nested params; exhausts BEAM schedulers and causes downtime.
Patch when possible
- affected>= 1.15.0 and < 1.15.5
- affected>= 1.16.0 and < 1.16.4
- affected>= 1.17.0 and < 1.17.2
- affected>= 1.18.0 and < 1.18.3
- affected>= 1.19.0 and < 1.19.3
- affected>= 712b875d3442c765d8d37e546ffd5ad9f8afcc55 and < *
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.