CVE-2026-95508

Summary

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.

Affected Software

Weaknesses

• CWE-787: Out-of-bounds Write

Workarounds

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

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://access.redhat.com/security/cve/CVE-2026-95508
• https://bugzilla.redhat.com/show_bug.cgi?id=2537748

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