A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. (CVE-2026-95508)
Description
A heap-based buffer overflow vulnerability exists in the DHCPv6 and TFTP response builders of libslirp. This occurs when the host is configured with a small interface MTU and a guest supplies a DHCPv6 CLIENTID option or TFTP blksize option that overflows the reply buffer. The vulnerability can lead to denial of service and potentially arbitrary code execution in the host process. The default interface MTU configuration is not affected.
CVSS v3.1
Score 7.4high
Affected software
pkg:deb/ubuntu/libslirp?arch=source&distro=focalpkg:deb/ubuntu/libslirp?arch=source&distro=jammypkg:deb/ubuntu/libslirp?arch=source&distro=noblepkg:deb/ubuntu/libslirp?arch=source&distro=stonkingpkg:deb/ubuntu/libslirp?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-95508 describes a heap-based buffer overflow in libslirp's DHCPv6 and TFTP response builders. Specifically, when the host uses a small interface MTU, attacker-controlled DHCPv6 CLIENTID or TFTP blksize options from a guest can overflow the reply buffer, causing denial of service or possibly arbitrary code execution in the host process. The vulnerability affects multiple specific versions of libslirp as listed, but not the default MTU configuration.
Potential Impact
Successful exploitation can cause denial of service and potentially allow arbitrary code execution within the host process running libslirp. This elevates the risk to the host system from a guest-supplied network configuration option under certain MTU settings.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor vendor advisories for updates and consider avoiding configurations with small interface MTU values until a fix is available.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-95508
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f5172cdf04f656657c5f
Added to database: 10/17/2026, 22:22:15 UTC
Last enriched: 10/17/2026, 23:01:10 UTC
Last updated: 10/17/2026, 23:01:10 UTC
Views: 2
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