CVE-2026-5367: ovn
Vulnerability summary
CVE-2026-5367 is a high (CVSS 8.6) vulnerability in ovn. EPSS estimates a 0.88% chance of exploitation in the next 30 days, higher than 58.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 19 · Related 10Timeline
- 24-04-2026PublishedVulnerability first disclosed.
- 25-08-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- NVDNIST8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
EPSS trend
Probability
0.88%
Chance of exploitation in the next 30 days
Percentile
59%
Versus all other CVEs
30-day change
+0.01 pp
From 0.87% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- ovnAll versions (No fix recorded) | < 26.03.0-4
Ubuntu1 product
- ovnAll versions (No fix recorded)
2 vendors · 2 products
