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CVE-2026-21218

Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7035a225b1525fa94b8a8cd68a4b224035d9748745cdf2ab4a5a3ec067383978
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 3 assertions

{"product":".NET 9.0","vendor":"Microsoft","versions":[{"lessThan":"9.0.13","status":"affected","version":"9.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5581f5787ae7cc98de65800b00ce5275095844e31ba4f3f44134734de048513b · sha256:1d32d9a6284e8427… · /containers/cna/affected/2

{"product":".NET 8.0","vendor":"Microsoft","versions":[{"lessThan":"8.0.24","status":"affected","version":"8.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5581f5787ae7cc98de65800b00ce5275095844e31ba4f3f44134734de048513b · sha256:1d32d9a6284e8427… · /containers/cna/affected/1

{"product":".NET 10.0","vendor":"Microsoft","versions":[{"lessThan":"10.0.3","status":"affected","version":"10.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5581f5787ae7cc98de65800b00ce5275095844e31ba4f3f44134734de048513b · sha256:1d32d9a6284e8427… · /containers/cna/affected/0

Affected products and versions

3 source assertions
{"product":".NET 9.0","vendor":"Microsoft","versions":[{"lessThan":"9.0.13","status":"affected","version":"9.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5581f5787ae7cc98de65800b00ce5275095844e31ba4f3f44134734de048513b · sha256:1d32d9a6284e8427… · /containers/cna/affected/2
{"product":".NET 8.0","vendor":"Microsoft","versions":[{"lessThan":"8.0.24","status":"affected","version":"8.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5581f5787ae7cc98de65800b00ce5275095844e31ba4f3f44134734de048513b · sha256:1d32d9a6284e8427… · /containers/cna/affected/1
{"product":".NET 10.0","vendor":"Microsoft","versions":[{"lessThan":"10.0.3","status":"affected","version":"10.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5581f5787ae7cc98de65800b00ce5275095844e31ba4f3f44134734de048513b · sha256:1d32d9a6284e8427… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5581f5787ae7cc98de65800b00ce5275095844e31ba4f3f44134734de048513b · sha256:1d32d9a6284e8427… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-166","description":"CWE-166: Improper Handling of Missing Special Element","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5581f5787ae7cc98de65800b00ce5275095844e31ba4f3f44134734de048513b · sha256:1d32d9a6284e8427… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":".NET Spoofing Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21218"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5581f5787ae7cc98de65800b00ce5275095844e31ba4f3f44134734de048513b · sha256:1d32d9a6284e8427… · /containers/cna/references/0

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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