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CVE-2026-56116

dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advertisement route information handling that allows an unauthenticated same-link attacker to cause denial of service by sending crafted Router Advertisements. Attackers can repeatedly send Router Advertisements containing Route Information options with a lifetime of zero, triggering unfreed allocations in routeinfo_findalloc() that cause linear memory exhaustion and eventual daemon crash.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d16ad856945b74925849d4ba20bafe58e9fc4d61e93e526fe233b52896b03e43
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"ADJACENT","baseScore":7.1,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1c2b930e63e927bf9d9cda7fe7f27f0b2eb77f83de2abc13b2d24807b3f3402b · sha256:44e73211cb4880ca… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1c2b930e63e927bf9d9cda7fe7f27f0b2eb77f83de2abc13b2d24807b3f3402b · sha256:44e73211cb4880ca… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"affected","packageURL":"pkg:github/NetworkConfiguration/dhcpcd","product":"dhcpcd","repo":"https://github.com/NetworkConfiguration/dhcpcd","vendor":"NetworkConfiguration","versions":[{"lessThanOrEqual":"10.3.2","status":"affected","version":"10.0.7","versionType":"semver"},{"status":"unaffected","version":"708b4a56bae080a5b18c2e0c4c6fbe103131a2b0","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1c2b930e63e927bf9d9cda7fe7f27f0b2eb77f83de2abc13b2d24807b3f3402b · sha256:44e73211cb4880ca… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"ADJACENT","baseScore":7.1,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1c2b930e63e927bf9d9cda7fe7f27f0b2eb77f83de2abc13b2d24807b3f3402b · sha256:44e73211cb4880ca… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1c2b930e63e927bf9d9cda7fe7f27f0b2eb77f83de2abc13b2d24807b3f3402b · sha256:44e73211cb4880ca… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-401","description":"Missing Release of Memory after Effective Lifetime","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1c2b930e63e927bf9d9cda7fe7f27f0b2eb77f83de2abc13b2d24807b3f3402b · sha256:44e73211cb4880ca… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["patch"],"url":"https://github.com/NetworkConfiguration/dhcpcd/commit/708b4a56bae080a5b18c2e0c4c6fbe103131a2b0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1c2b930e63e927bf9d9cda7fe7f27f0b2eb77f83de2abc13b2d24807b3f3402b · sha256:44e73211cb4880ca… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/dhcpcd-memory-leak-dos-via-ipv6-router-advertisement-handling"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1c2b930e63e927bf9d9cda7fe7f27f0b2eb77f83de2abc13b2d24807b3f3402b · sha256:44e73211cb4880ca… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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