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Weekly Signal
Live intelligence Updated 20 Aug 2026 · 23:29 UTC

GNU, Redhat · Gnutls, Enterprise Linux, Enterprise Linux For Els +11 more

CVE-2026-42009

A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The c...

Recommended action

Handle this through the normal risk-based patching cycle while monitoring for change. Red Hat Security advisory RHSA-2026:26319

View response plan
CVSS7.5
EPSS1.3%
KEVNo
ExploitationNone
RemediationNot yet verified ↓

Assessment

Why it matters

EPSS is 1.3%; technical severity is CVSS 7.5.

A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.

Who should care

  • Teams operating Gnutls, Enterprise Linux, Enterprise Linux For Els +11 more
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether Gnutls, Enterprise Linux, Enterprise Linux For Els +11 more is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. Red Hat Security advisory RHSA-2026:26319
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Treatment intelligence

Remediation intelligence

Not yet verified

Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.

Verification noteAutomated link verification has not completed for this guidance yet.

Advisory

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-475
Affected versions
GNU Gnutls (Version -); Redhat Enterprise Linux (Version 6.0 | Version 7.0 | Version 8.0 | Version 8.0); Redhat Enterprise Linux For Els (Version 8.10 | Version 8.10 | Version 9.8 | Version 9.8); Redhat Enterprise Linux For Eus (Version 9.8 | Version 9.8 | Version 10.2 | Version 10.2); Redhat Enterprise Linux For Ibm Z Systems (Version 8.0 s390x | Version 9.0 s390x | Version 9.0 s390x | Version 10.2); Redhat Enterprise Linux For Ibm Z Systems Els (Version 8.10 | Version 9.8 | Version 10.2); Redhat Enterprise Linux For Ibm Z Systems Eus (Version 9.8 | Version 10.2); Redhat Enterprise Linux For Power Little Endian (Version 8.0 ppc64le | Version 9.0 ppc64le | Version 10.0 | Version 10.2)
Fixed versions
No explicit fixed version is currently recorded.
Published
18 May 2026
Attack vector
Network
Privileges required
None
User interaction
None

Signal timeline

  1. CVE published
  2. Latest EPSS score: 1.3%
  3. Signal calculated at 13

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.