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CVE-2026-47778

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, a structural flaw was identified in DefaultCertValidator::verifySubjectAltName where the extracted DNS SAN string is cast to a C-style string using .c_str() before being passed to the Utility::dnsNameMatch() algorithm. If the attacker serves a certificate with a dNSName SAN containing an embedded NUL byte, the helper Utility::generalNameAsString captures the comple
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:883640777c83aaead25ab995cfe910864cd6d8bde4618d55fb01fca2a7199d1a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"envoy","vendor":"envoyproxy","versions":[{"status":"affected","version":">= 1.38.0, < 1.38.1"},{"status":"affected","version":">= 1.37.0, < 1.37.3"},{"status":"affected","version":">= 1.36.0, < 1.36.7"},{"status":"affected","version":"< 1.35.11"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a3e46bf6c137d08c773781f047859b08ea8e14d03eb901dc23436106966ce99c · sha256:b66c69f140852b81… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.4,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a3e46bf6c137d08c773781f047859b08ea8e14d03eb901dc23436106966ce99c · sha256:b66c69f140852b81… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-158","description":"CWE-158: Improper Neutralization of Null Byte or NUL Character","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a3e46bf6c137d08c773781f047859b08ea8e14d03eb901dc23436106966ce99c · sha256:b66c69f140852b81… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-f8x4-rw5x-f3r7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-f8x4-rw5x-f3r7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a3e46bf6c137d08c773781f047859b08ea8e14d03eb901dc23436106966ce99c · sha256:b66c69f140852b81… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-f8x4-rw5x-f3r7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a3e46bf6c137d08c773781f047859b08ea8e14d03eb901dc23436106966ce99c · sha256:b66c69f140852b81… · /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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