CVE-2026-5265Network attack vector

Guest heap disclosure via unchecked IP length

Published Apr 24, 2026 · Updated Apr 24, 2026

Out-of-bounds read in Red Hat Enterprise Linux Fast Datapath allows guest OS users to disclose heap data via crafted IP packets. OVN's pinctrl ICMP error handler trusts IPv4 ip_tot_len or IPv6 ip6_plen when copying the triggering packet into a reply, so an inflated length reads past the valid packet buffer. Exploitation requires a guest workload to trigger an ICMP error through a reject ACL, gateway MTU check, or rejecting load balancer; the reply can expose adjacent ovn-controller heap contents.

CVSS severity6.5
Medium
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in Red Hat Enterprise Linux Fast Datapath allows guest OS users to disclose heap data via crafted IP packets. OVN's pinctrl ICMP error handler trusts IPv4 ip_tot_len or IPv6 ip6_plen when copying the triggering packet into a reply, so an inflated length reads past the valid packet buffer. Exploitation requires a guest workload to trigger an ICMP error through a reject ACL, gateway MTU check, or rejecting load balancer; the reply can expose adjacent ovn-controller heap contents.

The record

CVE
CVE-2026-5265
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux Fast Datapath
Classifications
CWE-130
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux Fast DatapathAffected versions are unavailable in this record.

Published CVSS scores

6.5Red Hat, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-130Improper Handling of Length Parameter Inconsistency

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo