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.

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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 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat openshift Container Platform
Vendors & Products Redhat openshift Container Platform

Tue, 22 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 22 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


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: 2026-09-22T16:13:28.858Z

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

Link: CVE-2026-95508

cve-icon Vulnrichment

Updated: 2026-09-22T16:13:24.753Z

cve-icon NVD

Status : Awaiting Analysis

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

Modified: 2026-09-22T19:37:36.747

Link: CVE-2026-95508

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-22T07:27:49Z

Links: CVE-2026-95508 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-22T19:15:37Z

Weaknesses