FKIE_CVE-2026-12969
Vulnerability from fkie_nvd - Published: 2026-06-23 14:17 - Updated: 2026-08-31 12:17
Severity
Summary
An out-of-bounds read vulnerability exists in dnsmasq's find_soa() function in src/rfc1035.c. When parsing NS section records, extract_name() is called with extrabytes=0, failing to validate that 10 additional bytes exist for fixed-length DNS record fields. A remote attacker controlling a DNS zone can exploit this via a crafted NXDOMAIN response to cause a 10-byte heap out-of-bounds read, potentially accessing stale data from prior transactions.
References
| URL | Tags | ||
|---|---|---|---|
| secalert@redhat.com | https://access.redhat.com/security/cve/CVE-2026-12969 | Mitigation, Vendor Advisory | |
| secalert@redhat.com | https://bugzilla.redhat.com/show_bug.cgi?id=2491663 | Issue Tracking, Vendor Advisory |
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| redhat | enterprise_linux | 10.0 | |
| thekelleys | dnsmasq | * |
{
"affected": [
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],
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"packageName": "dnsmasq",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat"
},
{
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"cpes": [
"cpe:/o:redhat:enterprise_linux:6"
],
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"packageName": "dnsmasq",
"product": "Red Hat Enterprise Linux 6",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:7"
],
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"packageName": "dnsmasq",
"product": "Red Hat Enterprise Linux 7",
"vendor": "Red Hat"
},
{
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"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
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"packageName": "dnsmasq",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9"
],
"defaultStatus": "unaffected",
"packageName": "dnsmasq",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:openshift:4"
],
"defaultStatus": "unaffected",
"packageName": "openshift/ose-rhel-coreos-8",
"product": "Red Hat OpenShift Container Platform 4",
"vendor": "Red Hat"
},
{
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"product": "Red Hat OpenShift Container Platform 4",
"vendor": "Red Hat"
}
],
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}
],
"configurations": [
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "An out-of-bounds read vulnerability exists in dnsmasq\u0027s find_soa() function in src/rfc1035.c. When parsing NS section records, extract_name() is called with extrabytes=0, failing to validate that 10 additional bytes exist for fixed-length DNS record fields. A remote attacker controlling a DNS zone can exploit this via a crafted NXDOMAIN response to cause a 10-byte heap out-of-bounds read, potentially accessing stale data from prior transactions."
}
],
"id": "CVE-2026-12969",
"lastModified": "2026-08-31T12:17:53.840",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
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"role": "CISA Coordinator",
"timestamp": "2026-06-23T15:02:23.863843Z",
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"published": "2026-06-23T14:17:22.790",
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}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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