CVE-2026-84782VulnerabilityPublished 29 Oct 2026Updated 30 Oct 2026

Red Hat Security Advisory: General availability of the satellite/iop-advisor-backend-rhel9 container image

Affects Red HatSource GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 21:05 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.8% chance of exploitation in 30 days – higher than 57% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 29 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

Users should monitor Red Hat advisories for updates. Since the flaw affects DTLS over UDP with non-blocking I/O, avoiding or disabling DTLS in affected environments may reduce exposure. Red Hat recommends consulting the Red Hat Satellite documentation and security advisories for guidance. Customers with Red Hat Technical Account Managers can seek direct assistance. No generic mitigations are provided by Red Hat at this time.

Description

CVE-2026-84782 is a vulnerability in OpenSSL's Datagram Transport Layer Security (DTLS) retransmission mechanism. It improperly handles handshake message writes that are suspended before completion, allowing a remote attacker to cause out-of-bounds memory reads or crash the process. This can lead to information disclosure or denial of service. The flaw affects software using DTLS over UDP with non-blocking I/O, but not standard TLS over TCP. Red Hat Satellite includes Red Hat Lightspeed, which uses OpenSSL, but exposure is limited to specific configurations.

Impact

An unauthenticated remote attacker can exploit this vulnerability to cause out-of-bounds memory reads leading to potential information disclosure or trigger a denial of service by crashing the affected process. The impact is limited to applications using DTLS over UDP with non-blocking I/O, which is less common than standard TLS over TCP. Red Hat systems using OpenSSL for DTLS may be affected, but typical workloads using TLS over TCP are not impacted.

Summary

The vulnerability CVE-2026-84782 exists in OpenSSL's DTLS retransmission mechanism where suspended handshake message writes are not properly handled. This flaw can be exploited remotely without authentication to cause OpenSSL to read beyond the message buffer or overwrite internal state, potentially exposing sensitive information or causing a denial of service by crashing the process. Red Hat Enterprise Linux uses OpenSSL broadly, but the vulnerability only affects DTLS over UDP under non-blocking I/O, not typical TLS over TCP connections. Red Hat Satellite's Red Hat Lightspeed component uses OpenSSL and may be impacted if configured to use DTLS.

CWE-125Out-of-bounds Read (opens in a new tab)
Base weaknessCWE Top 25 (2025): #8
The product reads data past the end, or before the beginning, of the intended buffer.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design · Language Selection
Use a language that provides appropriate memory abstractions.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Overread Buffers (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 30 Oct 2026, 21:05 UTC

WeaknessesCWE-125

Technical details

References

Community reviews

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