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  4. CVE 2026 5367 ovn ovn information disclosure via crafted dhcpv6
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Back to active CVEs
High · CVSS 8.6CVE-2026-5367

Ovn: ovn: information disclosure via crafted dhcpv6 packetsCVE-2026-5367

Answer in brief

CVE-2026-5367 records a High severity (CVSS 8.6) vulnerability in Ovn: ovn: information disclosure via crafted dhcpv6 packets. The current sources do not mark it as known exploited. The current feed maps Red Hat/ovn-2021 (generic), Red Hat/ovn23.03 (generic), Red Hat/ovn23.06 (generic), Red Hat/ovn24.03 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 24, 2026Updated Aug 25, 2026Source checked Oct 9, 2026First seen by HOL Jul 15, 2026Material review Aug 25, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.6
Exploitation
Not marked as known exploited
Affected software
6 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 8.6. 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.

Affected scope and exposure questions

The current feed maps Red Hat/ovn-2021 (generic), Red Hat/ovn23.03 (generic), Red Hat/ovn23.06 (generic), Red Hat/ovn24.03 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/ovn-2021generic*Not reported
Red Hat/ovn23.03generic*Not reported
Red Hat/ovn23.06generic*Not reported
Red Hat/ovn24.03generic*Not reported
Red Hat/ovn24.09generic*Not reported
Red Hat/ovn25.03generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/ovn-2021, Red Hat/ovn23.03, Red Hat/ovn23.06.
  2. 2Review the reported fix. Source-reported workaround: The only potential mitigation is to disable the DHCPv6 feature for workloads attached to OVN logical ports, e.g.: ovn-nbctl clear logical_switch_port <workload-port> dhcpv6_options. We do not recommend mitigating the vulnerability this way because it will also disable legitimate DHCPv6 traffic originating from workloads connected to logical switch ports.

Evidence timeline and material changes

  1. Published upstream

    Apr 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jul 15, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencesecurity.access.redhat.com
  • Source referenceopenwall.com
  • Source referenceopenwall.com
Upstream source description

A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets with an inflated Client ID length, could cause the ovn-controller to read beyond the bounds of a packet. This out-of-bounds read can lead to the disclosure of sensitive information stored in heap memory, which is then returned to the attacker's virtual machine port.

Quoted source text, attributed separately from HOL analysis.

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  • Predictable Media Stream Pre-Shared Key Vulnerability in TP-Link Tapo C325WBSame generic ecosystem
  • Eog: eog: arbitrary code execution via heap buffer overflow in png metadata readerSame generic ecosystem
  • fast-jwt treats raw public JWK JSON as an HMAC secret, enabling HS256 token forgerySame generic ecosystem
  • Hazelcast: Authorization bypass in IMap Predicates APISame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-130
Source
CVE List V5
Source checked
Oct 9, 2026
References
14 linked sources
Open source record