CVE catalog
CVE-2026-95508
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 blk
- Severity
- High · CVSS 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.57% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libslirp | sid | 4.9.5-1 | fixed |
| Debian | libslirp | forky | 4.9.5-1 | fixed |
| Debian | libslirp | trixie | 4.8.0-1+deb13u1 | vulnerable |
| Debian | libslirp | bookworm | 4.7.0-1 | vulnerable |
| Ubuntu | libslirp | 20.04 | 4.0.0-1 | vulnerable |
| Ubuntu | libslirp | 20.04 | 4.0.0-2 | vulnerable |
| Ubuntu | libslirp | 20.04 | 4.1.0-1 | vulnerable |
| Ubuntu | libslirp | 20.04 | 4.1.0-2 | vulnerable |
| Ubuntu | libslirp | 20.04 | 4.1.0-2ubuntu1 | vulnerable |
| Ubuntu | libslirp | 20.04 | 4.1.0-2ubuntu2 | vulnerable |
| Ubuntu | libslirp | 20.04 | 4.1.0-2ubuntu2.1 | vulnerable |
| Ubuntu | libslirp | 20.04 | 4.1.0-2ubuntu2.2 | vulnerable |
| Ubuntu | libslirp | 22.04 | 4.4.0-1build1 | vulnerable |
| Ubuntu | libslirp | 22.04 | 4.6.1-1 | vulnerable |
| Ubuntu | libslirp | 22.04 | 4.6.1-1build1 | vulnerable |
| Ubuntu | libslirp | 22.04 | 4.6.1-1ubuntu0.2 | vulnerable |
| Ubuntu | libslirp | 24.04 | 4.7.0-1ubuntu1 | vulnerable |
| Ubuntu | libslirp | 24.04 | 4.7.0-1ubuntu2 | vulnerable |
| Ubuntu | libslirp | 24.04 | 4.7.0-1ubuntu3 | vulnerable |
| Ubuntu | libslirp | 24.04 | 4.7.0-1ubuntu3.1 | vulnerable |
| Ubuntu | libslirp | 26.10 | 4.9.1-1ubuntu1 | vulnerable |
| Ubuntu | libslirp | 26.10 | 4.9.3-1ubuntu1 | vulnerable |
| Ubuntu | libslirp | 26.04 | 4.8.0-1ubuntu1 | vulnerable |
| Ubuntu | libslirp | 26.04 | 4.9.1-1ubuntu1 | vulnerable |
| Ubuntu | libslirp | 26.04 | 4.9.1-1ubuntu1.1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libslirp | source | sid | 4.9.5-1 | not yet assigned | Not reported | [1148836] |
| Debian | libslirp | source | forky | 4.9.5-1 | not yet assigned | Not reported | [1148836] |
| Debian | libslirp | source | trixie | (unfixed) | not yet assigned | Not reported | [1148836] |
| Debian | libslirp | source | bookworm | (unfixed) | not yet assigned | Not reported | [1148836] |
Notes
[trixie] libslirp: Minor issue [bookworm] libslirp: Minor issue; overflow needs a non-default, very small interface MTU
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libslirp0]Affected
Source package: [libslirp]
Details (2)
4.7.0-1· amd64 · bookwormAffected
nvd · libslirp · debian · bookworm; nvd · libslirp · debian · 12
4.7.0-1· arm64 · bookwormAffected
nvd · libslirp · debian · bookworm; nvd · libslirp · debian · 12
- [libslirp-dev]Affected
Source package: [libslirp]
Details (2)
4.7.0-1· amd64 · bookwormAffected
nvd · libslirp · debian · bookworm; nvd · libslirp · debian · 12
4.7.0-1· arm64 · bookwormAffected
nvd · libslirp · debian · bookworm; nvd · libslirp · debian · 12
[Debian 13 (Trixie)]
- [libslirp0]Affected
Source package: [libslirp]
Details (2)
4.8.0-1+deb13u1· amd64 · trixieAffected
nvd · libslirp · debian · 13
4.8.0-1+deb13u1· arm64 · trixieAffected
nvd · libslirp · debian · 13
- [libslirp-dev]Affected
Source package: [libslirp]
Details (2)
4.8.0-1+deb13u1· amd64 · trixieAffected
nvd · libslirp · debian · 13
4.8.0-1+deb13u1· arm64 · trixieAffected
nvd · libslirp · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-95508]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-95508]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-95508]
- [https://security-tracker.debian.org/tracker/CVE-2026-95508]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-95508.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]