CVE-2026-4890: dnsmasq Infinite Loop
CVSS: 7.5v3.1HighAwaiting analysis
AliasesALPINE-CVE-2026-4890UBUNTU-CVE-2026-4890DEBIAN-CVE-2026-4890CGA-4h37-9xvg-j83vCGA-c88f-447w-5hr2CGA-qm32-56x2-pfgvCGA-x7px-6wx2-pqx5
Published 11-05-2026Last modified 01-09-2026
Vulnerability summary
CVE-2026-4890 is a high (CVSS 7.5) Infinite Loop vulnerability in dnsmasq. EPSS estimates a 1.07% chance of exploitation in the next 30 days, higher than 64.2% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
1.07%
0%100%
Low · -7.78 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 7 · Related 4Timeline
- 11-05-2026PublishedVulnerability first disclosed.
- 01-09-2026Last modifiedVulnerability information updated.
Description
A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.
CVSS metrics
7 scores · 7 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 7 agree
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.07%
Chance of exploitation in the next 30 days
Percentile
64%
Versus all other CVEs
30-day change
-7.78 pp
From 8.85% on 19-09-2026
19-09-202619-10-2026
EPSS score1.07%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard2 products
- dnsmasq< 2.93-r0
- dnsmasq-doc< 2.93-r0
Wolfi2 products
- dnsmasq< 2.93-r0
- dnsmasq-doc< 2.93-r0
Alpine1 product
- dnsmasq< 2.91-r1 | < 2.92_p2-r0
Debian1 product
- dnsmasq< 2.90-4~deb12u2 | < 2.91-1+deb13u1 | < 2.92-5
Dnsmasq1 product
- dnsmasq< 2.92rel2
Ubuntu1 product
- dnsmasq< 2.90-0ubuntu0.16.04.1+esm3 | < 2.90-0ubuntu0.18.04.1+esm3 | < 2.90-0ubuntu0.20.04.1+esm2 | < 2.90-0ubuntu0.22.04.3 | < 2.90-2ubuntu0.3 | < 2.91-1ubuntu0.2 | < 2.92-1ubuntu0.2
6 vendors · 8 products
