CVE-2026-41292
No exploitation reported by the sources we read.
- Published2026-05-20
- Fixed in1.25.1
- WeaknessCWE-1050 · CWE-407 · CWE-770
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).
Timeline
dates in UTC- 2026-05-2010:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-41292?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-41292?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.25 | < 1.25.1 | 1.25.1 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- unboundAlmaLinux:10all versions · fixed in 1.24.2-7.el10_2.2and 6 other packages
- unboundAlmaLinux:9all versions · fixed in 1.24.2-3.el9_8.2and 4 other packages
- unboundAlmaLinux:8all versions · fixed in 1.16.2-5.12.el8_10and 3 other packages
Vendor advisories
unbound: Unbound: Denial of Service via excessive EDNS options
unbound as a component of Red Hat Enterprise Linux 6 · unbound-devel as a component of Red Hat Enterprise Linux 6 · unbound-libs as a component of Red Hat Enterprise Linux 6 · +12 more
Red Hat Security Advisory: OpenShift Container Platform 4.22.10 bug fix and security update
Red Hat Security Advisory: unbound security update
Red Hat Security Advisory: unbound security update
Red Hat Security Advisory: unbound security update
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Fix
- Update Nlnetlabs unbound to 1.25.1
- Vendor fix Red Hat Product Security RHSA-2026:54769 · 4 productsFor OpenShift Container Platform 4.22 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
- Vendor fix Red Hat Product Security RHSA-2026:37282 · 39 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2026:24013 · 17 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
- Workaround from the vendor Red Hat Product Security RHSA-2026:54769 · 4 productsDisclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations …
- No fix available, says the vendor Red Hat Product Security CVE-2026-41292 · 15 productsAffected
Advisories and patches
- www.nlnetlabs.nlMitigation · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- CISA-ADPSSVC decisionnone2026-05-20
- OpenCVESSVC decisionnone—
- CNACVSS 4.06.6read 2026-10-23
- CNACVSS 3.17.5read 2026-10-23
- NVDCVSS 3.17.5read 2026-10-23
- CNAweakness (CWE)CWE-1050, CWE-407, CWE-770read 2026-10-23
- FIRST EPSSEPSS score0.8 %2026-10-23
- OSVaffected packages—
- Microsoft MSRCadvisory—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 4.0 vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Red
- Published
- 2026-05-20
- Last Modified
- 2026-08-26
- NVD status
- Modified
- MSRC Title
- Long list of incoming EDNS options degrades performance
Frequently asked questions
What is CVE-2026-41292?
Is CVE-2026-41292 actively exploited?
What is the CVSS score for CVE-2026-41292?
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Same product first, then the same vendor advisory and the same publication week.