GnuTLS Datagram Transport Layer Security Packet input behavior

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability was found in GnuTLS. It has been declared as problematic. Impacted is an unknown function of the component Datagram Transport Layer Security Packet Handler. Executing a manipulation can lead to input behavior. This vulnerability appears as CVE-2026-42009. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in GnuTLS (version now known) and classified as problematic. This vulnerability affects some unknown processing of the component Datagram Transport Layer Security Packet Handler. The manipulation with an unknown input leads to a input behavior vulnerability. The CWE definition for the vulnerability is CWE-475. The behavior of this function is undefined unless its control parameter is set to a specific value. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at access.redhat.com. This vulnerability was named CVE-2026-42009 since 04/23/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 315514 (Debian dsa-6281 : gnutls-bin - security update), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (315514), EUVD (EUVD-2026-30769) and CERT Bund (WID-SEC-2026-1312). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • IBM MQ
  • Microsoft Azure Linux
  • Open Source GnuTLS

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (redhat): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input behavior
CWE: CWE-475
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 315514
Nessus Name: Debian dsa-6281 : gnutls-bin - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/23/2026 CVE reserved
05/18/2026 +25 days Advisory disclosed
05/18/2026 +0 days VulDB entry created
06/20/2026 +32 days VulDB entry last update

Sourcesinfo

Advisory: access.redhat.com
Status: Not defined

CVE: CVE-2026-42009 (🔒)
GCVE (CVE): GCVE-0-2026-42009
GCVE (VulDB): GCVE-100-364468
EUVD: 🔒
CERT Bund: WID-SEC-2026-1312 - GnuTLS: Mehrere Schwachstellen

Entryinfo

Created: 05/18/2026 15:59
Updated: 06/20/2026 01:56
Changes: 05/18/2026 15:59 (60), 05/18/2026 16:13 (1), 05/20/2026 12:54 (2), 06/04/2026 02:53 (7), 06/20/2026 01:56 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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