CVE-2026-22863
Pre-2.6 Deno crypto finalization flaw enables unlimited encryptions.
Is CVE-2026-22863 being exploited?
Not confirmed. CVE-2026-22863 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 0.21% probability of exploitation in the next 30 days.
How severe is CVE-2026-22863?
CVE-2026-22863 is rated Critical with a CVSS score of 9.2. 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-2026-22863?
Yes. A fix has been recorded for CVE-2026-22863. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-22863 affect?
CVE-2026-22863 affects Deno pre-2.6.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-22863?
Upgrade to Deno 2.6.0+; restart services and verify crypto
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Allows brute-force of server secrets via non-finalized cipher, risking confidentiality.
Immediate action required
- affected< 2.6.0
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.