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CVE-2026-84782: Issue summary: The DTLS retransmission logic does not correctly handle a handshake message write that is suspe

53
This month
HIGH 8.2REMOTEWATCHLISTUPGRADE

CVE-2026-84782 is a high-severity flaw (CVSS 8.2) affecting openssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Issue summary: The DTLS retransmission logic does not correctly handle a handshake message write that is suspended part-way through. The retransmitted message can be read past the message buffer and the retransmission overwrites the internal state the suspended write needs to resume correctly. Impact summary: The retransmitted message can disclose a heap memory to the peer as plaintext handshake data or cause a crash and a Denial of Service when

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score8.2 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.8% (top 43%)
CISA exploited listNo
WeaknessCWE-125
Published2026-09-29
Last modified2026-10-08
Publisher (CNA): OpenSSL Software Foundation · Vendor: openssl

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Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

openssl openssl UPGRADE
Affected: >= 1.0.2 and < 1.0.2zs · >= 1.1.1 and < 1.1.1zj · >= 3.0.0 and < 3.0.23 · >= 3.4.0 and < 3.4.8 · >= 3.5.0 and < 3.5.9 · >= 3.6.0 and < 3.6.5 · >= 4.0.0 and < 4.0.3
Fixed in: 1.0.2zs, 1.1.1zj, 3.0.23, 3.4.8, 3.5.9, 3.6.5, 4.0.3
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy openssl || rpm -q openssl || openssl --version
2. UPGRADE to 1.0.2zs (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade openssl
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade openssl
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Advisories and coverage

Official advisories

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-84782?

openssl: upgrade to 1.0.2zs, 1.1.1zj, 3.0.23, 3.4.8, 3.5.9, 3.6.5, 4.0.3. Exact commands for each OS are on this page.

Is CVE-2026-84782 being exploited?

CVE-2026-84782 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-84782 affect?

CVE-2026-84782 affects openssl. Severity is high (CVSS 8.2). Issue summary: The DTLS retransmission logic does not correctly handle a handshake message write that is suspended part-way through. The retransmitted message can be read past the message buffer and the retransmission overwrites the interna

How urgent is CVE-2026-84782?

Priority 53/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities

Related CVEs

References

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