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Noroxi
CVE-2026-5367· NVD / CVE Program· CNA redhat

Ovn: ovn: information disclosure via crafted dhcpv6 packets

Noroxi assessment

Priority: Monitor (action score 34/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.87% (FIRST EPSS); higher than 58.3% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: ovn (Debian:14) 26.03.0-4; openvswitch (openSUSE:Leap 16.0) 3.5.4-160000.4.1; openvswitch (openSUSE:Tumbleweed) 3.7.1-34.1.

Low priority for now. Upgrade to ovn (Debian:14) 26.03.0-4; openvswitch (openSUSE:Leap 16.0) 3.5.4-160000.4.1; openvswitch (openSUSE:Tumbleweed) 3.7.1-34.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.6 · v3.1—No exploit Fix available
Published
Apr 24, 2026
Updated
Aug 25, 2026
EPSS
0.8% · 58th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
8.6
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-5367

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
enterprise linux10
enterprise linux8
enterprise linux9
openshift4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Fast Datapath for Red Hat Enterprise Linux 10

    • 0:25.03.2-100.el10fdp and laternot affected · rpm
    • 0:25.09.2-103.el10fdp and laternot affected · rpm

  • Red Hat Fast Datapath for Red Hat Enterprise Linux 8

    • 0:21.12.0-145.el8fdp and laternot affected · rpm
    • 0:23.06.4-30.el8fdp and laternot affected · rpm

  • Red Hat Fast Datapath for Red Hat Enterprise Linux 9

    • 0:23.06.4-30.el9fdp and laternot affected · rpm
    • 0:23.09.6-16.el9fdp and laternot affected · rpm
    • 0:24.03.7-82.el9fdp and laternot affected · rpm
    • 0:25.03.2-100.el9fdp and laternot affected · rpm
    • 0:25.09.2-103.el9fdp and laternot affected · rpm

  • Red Hat Fast Datapath for RHEL 8

    • all versionsunknown
    • all versionsunknown
    • all versionsunknown
    • all versionsaffected

  • Red Hat Fast Datapath for RHEL 9

    • all versionsaffected
    • all versionsaffected

  • Red Hat Red Hat OpenShift Container Platform 4

    • all versionsunknown
    • all versionsunknown
    • all versionsunknown
    • all versionsunknown
    • all versionsaffected
    • all versionsunknown
    • all versionsaffected
    • all versionsaffected
    • all versionsaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12ovnfrom 0—
Debian:14ovnbefore 26.03.0-426.03.0-4
openSUSE:Leap 16.0openvswitchbefore 3.5.4-160000.4.13.5.4-160000.4.1
openSUSE:Tumbleweedopenvswitchbefore 3.7.1-34.13.7.1-34.1
Red Hat:enterprise_linux:10::fastdatapathovn25.03before 0:25.03.2-100.el10fdp0:25.03.2-100.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.03-centralbefore 0:25.03.2-100.el10fdp0:25.03.2-100.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.03-central-debuginfobefore 0:25.03.2-100.el10fdp0:25.03.2-100.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.03-debuginfobefore 0:25.03.2-100.el10fdp0:25.03.2-100.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.03-debugsourcebefore 0:25.03.2-100.el10fdp0:25.03.2-100.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.03-hostbefore 0:25.03.2-100.el10fdp0:25.03.2-100.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.03-host-debuginfobefore 0:25.03.2-100.el10fdp0:25.03.2-100.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.03-vtepbefore 0:25.03.2-100.el10fdp0:25.03.2-100.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.03-vtep-debuginfobefore 0:25.03.2-100.el10fdp0:25.03.2-100.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.09before 0:25.09.2-103.el10fdp0:25.09.2-103.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.09-centralbefore 0:25.09.2-103.el10fdp0:25.09.2-103.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.09-central-debuginfobefore 0:25.09.2-103.el10fdp0:25.09.2-103.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.09-debuginfobefore 0:25.09.2-103.el10fdp0:25.09.2-103.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.09-debugsourcebefore 0:25.09.2-103.el10fdp0:25.09.2-103.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.09-hostbefore 0:25.09.2-103.el10fdp0:25.09.2-103.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.09-host-debuginfobefore 0:25.09.2-103.el10fdp0:25.09.2-103.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.09-vtepbefore 0:25.09.2-103.el10fdp0:25.09.2-103.el10fdp
Red Hat:enterprise_linux:10::fastdatapathovn25.09-vtep-debuginfobefore 0:25.09.2-103.el10fdp0:25.09.2-103.el10fdp
Red Hat:enterprise_linux:8::fastdatapathovn-2021before 0:21.12.0-145.el8fdp0:21.12.0-145.el8fdp
Red Hat:enterprise_linux:8::fastdatapathovn-2021-centralbefore 0:21.12.0-145.el8fdp0:21.12.0-145.el8fdp

+68

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-5265Ovn: ovn: heap over-read in icmp error response generation
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:ovn26.03.0-4 · Debian:14Package registry (OSV)
opensuse:openvswitch3.7.1-34.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:ovn-20210:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn-2021-central0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn-2021-central-debuginfo0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn-2021-debuginfo0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn-2021-debugsource0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn-2021-host0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn-2021-host-debuginfo0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn-2021-vtep0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn-2021-vtep-debuginfo0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn23.060:23.06.4-30.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn23.06-central0:23.06.4-30.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:ovn23.06-central-debuginfo0:23.06.4-30.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
suse:openvswitch3.1.7-6.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:openvswitch33.1.7-150500.3.31.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-52650 days apartOvn: ovn: heap over-read in icmp error response generation
    26Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-130 · Improper Handling of Length Parameter Inconsistency

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (13 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records