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Vulnerabilities

Vulnerability · CVE-2026-5265

When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-

Published Apr 24, 2026 · catalog updated Oct 24, 2026 · When generating an ICMP

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-5265. EPSS is 0.63%. Act only if a listed version of When generating an ICMP is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (When generating an ICMP).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.63%
Remediation
Advisory link
Affected products
Debian:12 ovn · Debian:13 ovn

When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g., by hitting a reject ACL), causing ovn-controller to read heap memory beyond the valid packet data and include it in the ICMP response sent back to the VM.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 ovn23.03.0-1, 23.03.0-2, 23.03.0-3
  • Debian:13 ovn25.03.0-1, 25.09.0-1, 25.09.0-2

How to fix CVE-2026-5265

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-5265. EPSS is 0.63%. Act only if a listed version of When generating an ICMP is installed.

Which versions are affected?

Compare what you have installed with 23.03.0-1, 23.03.0-2, 23.03.0-3, 25.03.0-1, 25.09.0-1, 25.09.0-2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-130. EPSS 0.63%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 24, 2026 · NIST NVD

    Detected

    When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g.,

  2. Jun 17, 2026 · NIST NVD

    Updated

    When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g.,

  3. Oct 24, 2026 · Trivy Vulnerability DB

    Updated

    When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g.,

Sources

  • CVE.orgVulnerability recordCVE-2026-5265

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-5265

    30-day exploitation probability 0.63%

    first.org
  • NIST NVDVulnerability recordCVE-2026-5265

    When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the act

    nvd.nist.gov
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-5265

    When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the act

    osv.dev

References

Freshness

Last verified in this catalog Oct 25, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 25, 2026
  • Trivy Vulnerability DBOct 24, 2026
  • CVE.orgOct 16, 2026
  • NIST NVDOct 15, 2026