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CVE-2026-14440

Description: To issue and renew TLS certificates on behalf of customers, Cloudflare's Universal SSL feature automatically manages the CAA RRset for the customer's zone. This auto-managed RRset is permissive by design (e.g. 'issue "letsencrypt.org"' without parameters). On Universal SSL zones, Cloudflare's authoritative DNS serves this auto-managed RRset at query time, superseding any customer-configured CAA records on the zone. When a customer publishes a stricter CAA record using the RFC 86
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a79d8a4fadf9b242b47d173e86052e06fd9914505a089baaebfe6c16d05030a2
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":{"attackComplexity":"HIGH","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/adp/0/metrics/0/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"ADJACENT","baseScore":7.6,"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:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpa…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","platforms":["Cloud Service"],"product":"Universal SSL","vendor":"Cloudflare","versions":[{"lessThanOrEqual":"current","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/adp/0/metrics/0/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"ADJACENT","baseScore":7.6,"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:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpa…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-693","description":"CWE-693 Protection Mechanism Failure","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

8 source assertions
{"tags":["related"],"url":"https://community.cloudflare.com/t/critical-security-gap-cloudflare-must-fully-support-rfc-8657-caa/799999/10"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/adp/0/references/1
{"tags":["related"],"url":"https://community.cloudflare.com/t/universal-ssl-exposes-domains-to-bgp-leaks-re-venezuela-analysis/879930"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/adp/0/references/2
{"tags":["technical-description","exploit"],"url":"https://david-osipov.vision/en/blog/cybersecurity/cloudflare-ssl-mitm-flaw-2026/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/adp/0/references/0
{"url":"https://developers.cloudflare.com/ssl/edge-certificates/caa-records/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/cna/references/0
{"url":"https://developers.cloudflare.com/ssl/edge-certificates/universal-ssl/limitations/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/cna/references/1
{"url":"https://www.rfc-editor.org/rfc/rfc8657"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/cna/references/2
{"url":"https://www.rfc-editor.org/rfc/rfc8659"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/cna/references/3
{"tags":["technical-description","exploit"],"url":"https://zenodo.org/records/18330221"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c0f7d7dbd9098e0fdf9359843ee59db2d4facbe589580d71117e0fdb188e3e8 · sha256:d860018ad92679e6… · /containers/adp/0/references/3

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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