Gnutls: gnutls: denial of service via dtls zero-length fragment

Summary

A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.

Timeline

1. Apr 30, 2026, 5:41 PM UTCCVE published
2. Apr 30, 2026, 6:40 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 14, 2026, 7:09 PM UTCRecord last updated

Affected versions

• gnutls

  fixed in 3.8.13

• gnutls

  Version range not reported

• gnutls

  Version range not reported

• gnutls

  Version range not reported

• gnutls

  Version range not reported

• gnutls

  Version range not reported

• libtasn1

  Version range not reported

• gnutls

  Version range not reported

• libtasn1

  Version range not reported

• gnutls

  Version range not reported

• libtasn1

  Version range not reported

• gnutls

  Version range not reported

• libtasn1

  Version range not reported

• gnutls

  Version range not reported

• libtasn1

  Version range not reported

• gnutls

  Version range not reported

• libtasn1

  Version range not reported

• gnutls

  Version range not reported

• gnutls

  Version range not reported

• gnutls

  Version range not reported

• gnutls

  Version range not reported

• openshift/ose-rhel-coreos-8

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• cert-manager/jetstack-cert-manager-acmesolver-rhel9

  Version range not reported

• cert-manager/jetstack-cert-manager-rhel9

  Version range not reported

• cert-manager/cert-manager-operator-rhel9

  Version range not reported

• cert-manager/cert-manager-operator-bundle

  Version range not reported

• cert-manager/jetstack-cert-manager-acmesolver-rhel9

  Version range not reported

• cert-manager/jetstack-cert-manager-rhel9

  Version range not reported

• cert-manager/cert-manager-istio-csr-rhel9

  Version range not reported

• cert-manager/cert-manager-operator-rhel9

  Version range not reported

• cert-manager/cert-manager-operator-bundle

  Version range not reported

• cert-manager/cert-manager-trust-manager-rhel9

  Version range not reported

• rhaiis/model-opt-cuda-rhel9

  Version range not reported

• rhaiis/vllm-cuda-rhel9

  Version range not reported

• rhaiis/vllm-rocm-rhel9

  Version range not reported

• discovery/discovery-server-rhel9

  Version range not reported

• discovery/discovery-ui-rhel9

  Version range not reported

• gnutls-main

  Version range not reported

• rhai/base-image-neuron-rhel9

  Version range not reported

• rhui5/cds-rhel9

  Version range not reported

• rhui5/haproxy-rhel9

  Version range not reported

• rhui5/installer-rhel9

  Version range not reported

• rhui5/rhua-rhel9

  Version range not reported

• rhui5/cds-kubernetes-tp-rhel9

  Version range not reported

• rhui5/installer-tp-rhel9

  Version range not reported

• rhui5/rhua-tp-rhel9

  Version range not reported

• gnutls

  Version range not reported

• openshift4/ose-hypershift-rhel9

  Version range not reported

References 25