CVE catalog
CVE-2026-6507
A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configu
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.48% · Oct 25, 2026
A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the `--dhcp-split-relay` option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS).
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 | dnsmasq | sid | 2.93-3 | fixed |
| Debian | dnsmasq | forky | 2.93-3 | fixed |
| Debian | dnsmasq | trixie | 2.91-1+deb13u2 | not affected |
| Debian | dnsmasq | trixie-security | 2.91-1+deb13u1 | not affected |
| Debian | dnsmasq | bookworm | 2.90-4~deb12u2 | not affected |
| Debian | dnsmasq | bookworm-security | 2.90-4~deb12u2 | not affected |
| Cpe | dnsmasq | Not reported | Not reported | not affected |
| Ubuntu | dnsmasq | 26.04 | 2.91-1build1 | vulnerable |
| Ubuntu | dnsmasq | 26.04 | 2.92~rc3-1 | vulnerable |
| Ubuntu | dnsmasq | 26.04 | 2.92-1 | vulnerable |
| Ubuntu | dnsmasq | 26.04 | 2.92-1ubuntu0.2 | vulnerable |
| Ubuntu | dnsmasq | 26.04 | 2.92-1ubuntu0.3 | fixed |
| Ubuntu | dnsmasq | 26.04 | 2.91-1build1 | vulnerable |
| Ubuntu | dnsmasq | 26.04 | 2.92~rc3-1 | vulnerable |
| Ubuntu | dnsmasq | 26.04 | 2.92-1 | vulnerable |
| Ubuntu | dnsmasq | 26.04 | 2.92-1ubuntu0.2 | vulnerable |
| Ubuntu | dnsmasq | 26.04 | 2.92-1ubuntu0.3 | fixed |
| Opensuse | dnsmasq | tumbleweed | 2.92-3.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | dnsmasq | source | sid | 2.92-4 | not yet assigned | Not reported | [1134264] |
| Debian | dnsmasq | source | forky | 2.92-4 | not yet assigned | Not reported | [1134264] |
| Debian | dnsmasq | source | trixie | Not affected | unimportant | Not reported | [1134264] |
| Debian | dnsmasq | source | bookworm | Not affected | unimportant | Not reported | [1134264] |
| Ubuntu | dnsmasq | deb | 26.04 | 2.92-1ubuntu0.3 | Not reported | USN-8308-1 | Not reported |
| Ubuntu | dnsmasq | deb | 26.04 | 2.92-1ubuntu0.3 | Not reported | UBUNTU-CVE-2026-6507 | Not reported |
| Opensuse | dnsmasq | rpm | tumbleweed | 2.92-3.1 | Not reported | OPENSUSE-SU-2026:10605-1 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [dnsmasq-utils]Unknown
Source package: [dnsmasq]
Details (1)
2.93-2.3· x86_64 · tumbleweedUnknown · Fixed:
2.92-3.1Version impact unknown
nvd · dnsmasq · opensuse · tumbleweed
- [dnsmasq]Fixed
Source package: [dnsmasq]
Details (1)
2.93-2.3· x86_64 · tumbleweedFixed · Fixed:
2.92-3.1nvd · dnsmasq · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [dnsmasq]Not affected
Details (4)
2.90-4~deb12u2· all · bookwormNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· all · bookwormNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· all · bookworm-securityNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· all · bookworm-securityNot affected
nvd · dnsmasq · debian · bookworm
- [dnsmasq-base]Not affected
Source package: [dnsmasq]
Details (4)
2.90-4~deb12u2· amd64 · bookwormNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· arm64 · bookwormNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· amd64 · bookworm-securityNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· arm64 · bookworm-securityNot affected
nvd · dnsmasq · debian · bookworm
- [dnsmasq-base-lua]Not affected
Source package: [dnsmasq]
Details (4)
2.90-4~deb12u2· amd64 · bookwormNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· arm64 · bookwormNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· amd64 · bookworm-securityNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· arm64 · bookworm-securityNot affected
nvd · dnsmasq · debian · bookworm
- [dnsmasq-utils]Not affected
Source package: [dnsmasq]
Details (4)
2.90-4~deb12u2· amd64 · bookwormNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· arm64 · bookwormNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· amd64 · bookworm-securityNot affected
nvd · dnsmasq · debian · bookworm
2.90-4~deb12u2· arm64 · bookworm-securityNot affected
nvd · dnsmasq · debian · bookworm
Observed:
References
- [https://access.redhat.com/security/cve/CVE-2026-6507]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2459181]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_21192-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-6507]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-6507]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-6507]
- [https://osv.dev/vulnerability/USN-8308-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10605-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-6507]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6507.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1167.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]