Description
dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| dnsmasq | dnsmasq | < 2.92rel2 | 2.92rel2 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dnsmasq | 2.92-5 | — |
| Debian 13 | dnsmasq | 2.91-1+deb13u1 | — |
| Debian 12 | dnsmasq | 2.90-4~deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | dnsmasq | 2.92-1ubuntu0.2 | — |
| Ubuntu 25.10 | dnsmasq | 2.91-1ubuntu0.2 | — |
| Ubuntu 24.04 LTS | dnsmasq | 2.90-2ubuntu0.3 | — |
| Ubuntu 22.04 LTS | dnsmasq | 2.90-0ubuntu0.22.04.3 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | dnsmasq | 2.90-0ubuntu0.20.04.1+esm2 | — |
| Ubuntu Pro 18.04 LTS | dnsmasq | 2.90-0ubuntu0.18.04.1+esm3 | — |
| Ubuntu Pro 16.04 LTS | dnsmasq | 2.90-0ubuntu0.16.04.1+esm3 | — |
| Ubuntu Pro 14.04 LTS | dnsmasq | 2.68-1ubuntu0.2+esm5 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | dnsmasq +1 | 2.90-7.el10_2 | RHSA-2026:19158 |
| RHEL 9 | dnsmasq +1 | 2.85-18.el9_8.1 | RHSA-2026:19373 |
| RHEL 8 | dnsmasq +1 | 2.79-36.el8_10 | RHSA-2026:20589 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.6 EUS | dnsmasq +1 | 2.85-17.el9_6.1 | RHSA-2026:34508 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | dnsmasq +1 | 2.90-7.el10_2 | ALSA-2026:19158 |
| AlmaLinux 9 | dnsmasq +1 | 2.85-18.el9_8.1 | ALSA-2026:19373 |
| AlmaLinux 8 | dnsmasq +1 | 2.79-36.el8_10 | ALSA-2026:20589 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | dnsmasq | 2.90-7.el10_2 | RLSA-2026:19158 |
| Rocky Linux 9 | dnsmasq | 2.85-18.el9_8.1 | RLSA-2026:19373 |
| Rocky Linux 8 | dnsmasq | 2.79-36.el8_10 | RLSA-2026:20589 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | dnsmasq | 2.92rel2-18.27.1 | SUSE-SU-2026:2458-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | dnsmasq | 2.93-160000.1.1 | SUSE-SU-2026:22496-1 |
| SLES 16.0 | dnsmasq | 2.93-160000.1.1 | SUSE-SU-2026:22496-1 |
| SLE Micro 6.1 | dnsmasq | 2.93-slfo.1.1_1.1 | SUSE-SU-2026:22454-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dnsmasq | 2.92rel2-1.1 | openSUSE-SU-2026:10821-1 |
| openSUSE Leap 16.0 | dnsmasq | 2.93-160000.1.1 | openSUSE-SU-2026:21192-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dnsmasq | 2.92_p2-r0 | — |
| Alpine v3.23 | dnsmasq | 2.91-r1 | — |
| Alpine v3.22 | dnsmasq | 2.91-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | dnsmasq +1 | 2.90-1.amzn2023.0.2 | ALAS2023-2026-1516 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | dnsmasq | 2.92-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | dnsmasq +1 | 2.90-7.el10_2 | ELSA-2026-19158 |
| Oracle Linux 9 | dnsmasq +1 | 2.85-18.el9_8.1 | ELSA-2026-19373 |
| Oracle Linux 8 | dnsmasq +1 | 2.79-36.el8_10 | ELSA-2026-20589 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | dnsmasq +1 | 2.93-r0 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
JianrongXiao-Linksys/dnsmasq-cve-2026 ★ 0 · Jun 1, 2026
Automated defect verification tool for 6 dnsmasq CVEs (CVE-2026-2291, 4890, 4891, 4892, 4893, 5172)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 22
- WID-SEC-2026-1468 dnsmasq: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
- ALSA-2026:19373 Important: dnsmasq security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:19158 Important: dnsmasq security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:20589 Important: dnsmasq security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:34508 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:20589 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:19373 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:19158 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- VDE-2026-076 ads-tec Industrial IT: Multiple Vulnerabilities in ADS-TEC IRF Products CERT@VDE · Jul 28, 2026
- VDE-2026-081 Weidmueller: Security routers IE-SR-4TX and IE-SR-4GT are affected by multiple vulnerabilities CERT@VDE · Jul 28, 2026
- ELSA-2026-19158 Important: dnsmasq security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- SUSE-SU-2026:22496-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Jul 7, 2026
- SUSE-SU-2026:22454-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Jul 4, 2026
- openSUSE-SU-2026:21192-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Jul 3, 2026
- ELSA-2026-19373 Important: dnsmasq security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 23, 2026
- SUSE-SU-2026:2458-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Jun 19, 2026
- ALAS2023-2026-1516 Moderate: dnsmasq security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 8, 2026
- RLSA-2026:19158 Important: dnsmasq security update Rocky Linux Security Advisories · May 29, 2026
- RLSA-2026:20589 Important: dnsmasq security update Rocky Linux Security Advisories · May 29, 2026
- RLSA-2026:19373 Important: dnsmasq security update Rocky Linux Security Advisories · May 28, 2026
- ELSA-2026-20589 Important: dnsmasq security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 26, 2026
- openSUSE-SU-2026:10821-1 dnsmasq-2.92rel2-1.1 on GA media SUSE / openSUSE Security Updates · May 21, 2026
References
- https://www.suse.com/security/cve/CVE-2026-2291.html
- https://www.kb.cert.org/vuls/id/471747
- https://thekelleys.org.uk/dnsmasq/CVE/
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
- https://github.com/NixOS/nixpkgs/pull/519082
- https://github.com/NixOS/nixpkgs/pull/519093
- https://github.com/pi-hole/FTL/releases/tag/v6.6.2