CVE-2026-64193
Net::DNS (Perl) allows remote command execution via malformed EDNS EXTENDED-ERROR.
Is CVE-2026-64193 being exploited?
Not confirmed. CVE-2026-64193 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 0.79% probability of exploitation in the next 30 days.
How severe is CVE-2026-64193?
CVE-2026-64193 is rated Critical with a CVSS score of 9.8. 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-2026-64193?
Not known from our data. No patch reference has been recorded for CVE-2026-64193, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-64193 affect?
CVE-2026-64193 affects Net::DNS Perl module <= 1.55, Perl applications using Net::DNS, Services parsing DNS with Net::DNS (resolvers, mail/monitoring tools). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64193?
Apply vendor patch when available; audit Net::DNS usage; avoid array-context edns calls; filter untrusted DNS responses.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on applications using Net::DNS via crafted EDNS EXTENDED-ERROR payloads (unescaped backticks in eval).
Immediate action required
- affected<= 1.55
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.