---
title: "CVE-2026-84782: OpenSSL - Out-of-Bounds Read"
description: "OpenSSL contains an out-of-bounds read caused by improper handling of suspended DTLS handshake message writes during retransmission, letting remote peers disclose heap memory or cause denial of service, exploit requires DTLS handshake in progress with suspended write."
url: https://panop.io/threat-heartbeat/CVE-2026-84782/
---

# CVE-2026-84782 OpenSSL - Out-of-Bounds Read

OpenSSL contains an out-of-bounds read caused by improper handling of suspended DTLS handshake message writes during retransmission, letting remote peers disclose heap memory or cause denial of service, exploit requires DTLS handshake in progress with suspended write.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.39% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-84782)

## Details

Type

Out-of-Bounds Read

Impact

Information Disclosure, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Published

29 September 2026

Updated

15 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.html)

## Vendor fix

Update to the latest OpenSSL version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-84782](https://nvd.nist.gov/vuln/detail/CVE-2026-84782)
- [https://github.com/openssl/openssl/commit/d951e02ede8f6a6ff8150546db44b34f0518192c](https://github.com/openssl/openssl/commit/d951e02ede8f6a6ff8150546db44b34f0518192c)
- [https://openssl-library.org/news/secadv/20260929.txt](https://openssl-library.org/news/secadv/20260929.txt)
- [https://github.com/openssl/openssl/commit/906cf0ef1c85ca40ce69163e9086d6d3fe292943](https://github.com/openssl/openssl/commit/906cf0ef1c85ca40ce69163e9086d6d3fe292943)
- [https://github.com/openssl/openssl/commit/9f6b34422af7eb5dac61322e33dac1ae989fa628](https://github.com/openssl/openssl/commit/9f6b34422af7eb5dac61322e33dac1ae989fa628)
- [https://github.com/openssl/openssl/commit/a383dafdd754eb5b22bf45e37e1bff9d07277a58](https://github.com/openssl/openssl/commit/a383dafdd754eb5b22bf45e37e1bff9d07277a58)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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