A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

Do not configure SlirpConfig.if_mtu below the IPv6 minimum link MTU of 1280.

History

Tue, 22 Sep 2026 08:45:00 +0000

Type Values Removed Values Added
Description A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.
Title Libslirp: libslirp: heap buffer overflow in dhcpv6/tftp response builders on small interface mtu
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Weaknesses CWE-787
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-22T08:36:01.598Z

Reserved: 2026-09-22T07:22:20.302Z

Link: CVE-2026-95508

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-22T09:17:06.073

Modified: 2026-09-22T09:17:06.073

Link: CVE-2026-95508

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-22T09:30:07Z

Weaknesses