Vulnerability · Published Sep 22, 2026 · Assigned by redhat
CVE-2026-95508Libslirp: libslirp: heap buffer overflow in dhcpv6/tftp response builders on small interface mtu
High 7.4
In plain English
A high-severity out-of-bounds write in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libslirp | no fix listed | DEBIAN-CVE-2026-95508 |
| Debian:13 | libslirp | no fix listed | DEBIAN-CVE-2026-95508 |
| Debian:14 | libslirp | 4.9.5-1 | DEBIAN-CVE-2026-95508 |
| Ubuntu:22.04:LTS | libslirp | no fix listed | UBUNTU-CVE-2026-95508 |
| Ubuntu:24.04:LTS | libslirp | no fix listed | UBUNTU-CVE-2026-95508 |
| Ubuntu:26.04:LTS | libslirp | no fix listed | UBUNTU-CVE-2026-95508 |
| Ubuntu:26.10 | libslirp | no fix listed | UBUNTU-CVE-2026-95508 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 5 | see references |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-95508 vdb-entry, x_refsource_REDHAT
- RHBZ#2537748 issue-tracking, x_refsource_REDHAT