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CVE-2026-47775

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, the OAuth2 HTTP filter's encrypt()/decrypt() functions use AES-256-CBC without an authentication tag (no HMAC, no AEAD). The /callback endpoint returns HTTP 302 on successful decryption and HTTP 401 on padding failure, creating a padding oracle. An attacker who obtains the encrypted CodeVerifier cookie can recover the plaintext PKCE code_verifier in ~6,200 requests
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:66466c7d25cc9c5588f1f8be2764e341253a90e9c4e2b057d10895f526dbe773
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-327","description":"CWE-327: Use of a Broken or Risky Cryptographic Algorithm","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fa91a02171d77348b1b7468d02e7aac9430184c600998c77f36d24da167f5876 · sha256:8e08671729553df1… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-209","description":"CWE-209: Generation of Error Message Containing Sensitive Information","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fa91a02171d77348b1b7468d02e7aac9430184c600998c77f36d24da167f5876 · sha256:8e08671729553df1… · /containers/cna/problemTypes/0/descriptions/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:fa91a02171d77348b1b7468d02e7aac9430184c600998c77f36d24da167f5876 · sha256:8e08671729553df1… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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:fa91a02171d77348b1b7468d02e7aac9430184c600998c77f36d24da167f5876 · sha256:8e08671729553df1… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-327","description":"CWE-327: Use of a Broken or Risky Cryptographic Algorithm","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fa91a02171d77348b1b7468d02e7aac9430184c600998c77f36d24da167f5876 · sha256:8e08671729553df1… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-209","description":"CWE-209: Generation of Error Message Containing Sensitive Information","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fa91a02171d77348b1b7468d02e7aac9430184c600998c77f36d24da167f5876 · sha256:8e08671729553df1… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fa91a02171d77348b1b7468d02e7aac9430184c600998c77f36d24da167f5876 · sha256:8e08671729553df1… · /containers/adp/0/references/0
{"name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p","tags":["x_refsource_CONFIRM"],"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fa91a02171d77348b1b7468d02e7aac9430184c600998c77f36d24da167f5876 · sha256:8e08671729553df1… · /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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