CVE-2026-32688
Unauthenticated DoS in plug_cowboy via atom table exhaustion on HTTP/2.
Is CVE-2026-32688 being exploited?
Not confirmed. CVE-2026-32688 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 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-32688?
CVE-2026-32688 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-2026-32688?
Yes. A fix has been recorded for CVE-2026-32688. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-32688 affect?
CVE-2026-32688 affects plug_cowboy 2.0.0–2.8.0, Elixir/Phoenix apps using plug_cowboy, BEAM/Erlang VM. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-32688?
Upgrade to plug_cowboy 2.8.1+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Exhausts BEAM atom table with unique HTTP/2 scheme headers, crashing the VM and taking the node offline.
Immediate action required
- affected>= 2.0.0 and < 2.8.1
- affected>= 12ecfd024bb179d48b018fecf074e43fe6a19c83 and < bfb34cb45eb354e56437f7023fb306de1bf9c19b
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.