CVE-2026-95508 Libslirp: libslirp: heap buffer overflow in dhcpv6/tftp response builders on small interface mtu
Heap buffer overflow in libslirp allows guest-triggered DoS or code execution on hosts with small MTU settings.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-95508?
CVE-2026-95508 is a high-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2026-95508?
How do I fix CVE-2026-95508?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-95508 being exploited?
There is no known exploitation of CVE-2026-95508 in the wild and no public exploit code.
Sources
Also known as AZL-103472, DEBIAN-CVE-2026-95508, GHSA-3qjr-gg7g-qcrr, UBUNTU-CVE-2026-95508.