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CVE-2026-47221

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.18.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the router filter contains a null pointer dereference vulnerability when handling HTTP 303 (See Other) internal redirects for body-less non-GET/HEAD requests. When a POST, PUT, DELETE, or PATCH request without a body is sent to a route configured with internal redirect policy that includes 303 in redirect_response_codes, and the upstream responds with HTTP
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b350f3d174c4a5d25400e34f89329f21a1d31a27aaca6cdeb38f633667d2b63d
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, < 1.38.3"},{"status":"affected","version":">= 1.37.0, < 1.37.5"},{"status":"affected","version":">= 1.36.0, < 1.36.9"},{"status":"affected","version":">= 1.18.0, < 1.35.13"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:612ae4859d3571a6ac60d03fa9270bbff984e70eb67764618db5e82f62536fe2 · sha256:3fe2845fe0456aea… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/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:v2:612ae4859d3571a6ac60d03fa9270bbff984e70eb67764618db5e82f62536fe2 · sha256:3fe2845fe0456aea… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-476","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:612ae4859d3571a6ac60d03fa9270bbff984e70eb67764618db5e82f62536fe2 · sha256:3fe2845fe0456aea… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-rcff-gw58-pjpr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-rcff-gw58-pjpr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:612ae4859d3571a6ac60d03fa9270bbff984e70eb67764618db5e82f62536fe2 · sha256:3fe2845fe0456aea… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-rcff-gw58-pjpr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:612ae4859d3571a6ac60d03fa9270bbff984e70eb67764618db5e82f62536fe2 · sha256:3fe2845fe0456aea… · /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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