Answer in brief
CVE-2026-42009 records a High severity (CVSS 7.5) vulnerability in Gnutls: gnutls: denial of service via dtls packet reordering vulnerability. The current sources do not mark it as known exploited. The current feed maps gnutls (generic), gnutls (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps gnutls (generic), gnutls (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:gnu:gnutls:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:10.2:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:10.2:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:9.8:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_els:10.2:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_els:10.2:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_els:8.10:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_els:8.10:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_els:9.8:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_els:9.8:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_eus:10.2:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_eus:10.2:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_eus:9.8:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_eus:9.8:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0_s390x:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:9.0_s390x:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_els:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_els:8.10:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_els:9.8:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:9.8:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:10.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0_ppc64le:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:9.0_ppc64le:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_els:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_els:8.10:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_els:9.8:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:9.8:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_update_services_for_sap_solutions:9.8:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:9.8:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| gnutlsgeneric | >=0 <3.8.13 | 3.8.13 |
| gnutlsgeneric | 0 | Not reported |
| Red Hat/openshift/ose-rhel-coreos-8generic | * | Not reported |
| Red Hat/openshift/ose-rhel-coreos-9generic | * | Not reported |
Published upstream
May 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
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.
Quoted source text, attributed separately from HOL analysis.