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CVE-2026-43820

NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs. NIOSSL provides access to a buffer assumed to be backed by an ASN1_STRING, but not all SANs are backed by ASN1_STRING, so accessing the buffer for such a type can lead to out-of-bounds memory access. This vulnerability is addressed in swift-nio-ssl version 2.37.2.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:26b72d418d531672d27873032dc54e0f6df079f2649518e5c7e4b49023b0cc82
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a0f9d04afbd632e4ebe081bf13efb4b73872959b114aba5f15eff591fe2e14b5 · sha256:0af9d9be340d5b88… · /containers/adp/0/problemTypes/0/descriptions/0

{"description":"NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs. NIOSSL provides access to a buffer assumed to be backed by an ASN1_STRING, but not all SANs are backed by ASN1_STRING, so accessing the buffer for such a type can lead to out-of-bounds memory access.","lang":"en"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a0f9d04afbd632e4ebe081bf13efb4b73872959b114aba5f15eff591fe2e14b5 · sha256:0af9d9be340d5b88… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"swift-nio-ssl","vendor":"Apple","versions":[{"lessThan":"2.37.2","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0f9d04afbd632e4ebe081bf13efb4b73872959b114aba5f15eff591fe2e14b5 · sha256:0af9d9be340d5b88… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a0f9d04afbd632e4ebe081bf13efb4b73872959b114aba5f15eff591fe2e14b5 · sha256:0af9d9be340d5b88… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a0f9d04afbd632e4ebe081bf13efb4b73872959b114aba5f15eff591fe2e14b5 · sha256:0af9d9be340d5b88… · /containers/adp/0/problemTypes/0/descriptions/0
{"description":"NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs. NIOSSL provides access to a buffer assumed to be backed by an ASN1_STRING, but not all SANs are backed by ASN1_STRING, so accessing the buffer for such a type can lead to out-of-bounds memory access.","lang":"en"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a0f9d04afbd632e4ebe081bf13efb4b73872959b114aba5f15eff591fe2e14b5 · sha256:0af9d9be340d5b88… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"url":"https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0f9d04afbd632e4ebe081bf13efb4b73872959b114aba5f15eff591fe2e14b5 · sha256:0af9d9be340d5b88… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0f9d04afbd632e4ebe081bf13efb4b73872959b114aba5f15eff591fe2e14b5 · sha256:0af9d9be340d5b88… · /containers/adp/0/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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