Affects OpenSSL's DTLS implementation — a widely deployed crypto library; can cause data disclosure or DoS across many applications.
CVE-2026-84782
OpenSSL DTLS retransmission bug can leak heap data or crash (DoS).
Is CVE-2026-84782 being exploited?
Not confirmed. CVE-2026-84782 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.
How severe is CVE-2026-84782?
CVE-2026-84782 is rated High with a CVSS score of 8.2. 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-2026-84782?
Yes. A fix has been recorded for CVE-2026-84782. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-84782 affect?
CVE-2026-84782 affects OpenSSL (DTLS module), Applications using OpenSSL DTLS (VPNs, VoIP, IoT). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-84782?
Upgrade OpenSSL to the fixed release and restart DTLS-enabled services.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
DTLS retransmission OOB read can expose heap memory to a remote peer or crash the process, enabling data disclosure or DoS.
Immediate action required
- affected>= 4.0.0 and < 4.0.3
- affected>= 3.6.0 and < 3.6.5
- affected>= 3.5.0 and < 3.5.9
- affected>= 3.4.0 and < 3.4.8
- affected>= 3.0.0 and < 3.0.23
- affected>= 1.1.1 and < 1.1.1zj
- affected>= 1.0.2 and < 1.0.2zs
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.