Libslirp: libslirp: heap buffer overflow in dhcpv6/tftp response builders on small interface mtu
CVE-2026-95508 is fixed in libslirp on 1 platform by DEBIAN-CVE-2026-95508 (version 4.9.5-1), released September 29, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libslirp · Debian 14 | 4.9.5-1 | DEBIAN-CVE-2026-95508 | Sep 29, 2026 |
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