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Back to active CVEs
High · CVSS 7.5CVE-2026-6507

Dnsmasq: dnsmasq: denial of service due to out-of-bounds write in dhcp bootreply processingCVE-2026-6507

Answer in brief

CVE-2026-6507 records a High severity (CVSS 7.5) vulnerability in Dnsmasq: dnsmasq: denial of service due to out-of-bounds write in dhcp bootreply processing. The current sources do not mark it as known exploited. The current feed maps dnsmasq (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 17, 2026Updated Sep 1, 2026Source checked Oct 10, 2026First seen by HOL Aug 26, 2026Material review Sep 1, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps dnsmasq (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
dnsmasqgeneric>=2.92 <2.932.93

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for dnsmasq.
  2. 2Review the reported fix. Source-reported workaround: To mitigate this issue, ensure that the `dnsmasq` service is not configured with the `--dhcp-split-relay` option. If this option is currently in use, remove it from the `dnsmasq` configuration. After modifying the configuration, the `dnsmasq` service must be restarted for the changes to take effect. This may temporarily interrupt DHCP and DNS services provided by `dnsmasq`.

Evidence timeline and material changes

  1. Published upstream

    Apr 17, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 26, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

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).

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • JeecgBoot through 3.9.5 Missing Authorization via /sys/sysDepartPermission/deleteSame generic ecosystem
  • JeecgBoot through 3.9.5 Missing Authorization via sysDepartPermission queryById EndpointSame generic ecosystem
  • JeecgBoot through 3.9.5 Missing Authorization via /sys/sysDepartPermission/addSame generic ecosystem
  • JeecgBoot through 3.9.5 Missing Authorization via sysDepartPermission deleteBatch EndpointSame generic ecosystem
  • JeecgBoot through 3.9.5 Missing Authorization via getDepartmentHead EndpointSame generic ecosystem
  • JeecgBoot through 3.9.5 Missing Authorization via /sys/sysDepart/appImportExcelSame generic ecosystem

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Oct 10, 2026
References
2 linked sources
Open source record