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CVE-2026-28490

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption (JWE) RSA1_5 key management algorithm. Authlib registers RSA1_5 in its default algorithm registry without requiring explicit opt-in, and actively destroys the constant-time Bleichenbacher mitigation that the underlying cryptography library implements cor
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ee917398dd2498f9cd7673914da18a1b32ae33227392c2b3efd0b3addb6af6bb
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:v2:9c300e02fc68e7787b888874f1fbccca2cc2456cf96301d69b00ae234c9f40ff · sha256:dff24c11e9f3e80b… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-203","description":"CWE-203: Observable Discrepancy","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9c300e02fc68e7787b888874f1fbccca2cc2456cf96301d69b00ae234c9f40ff · sha256:dff24c11e9f3e80b… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"authlib","vendor":"authlib","versions":[{"status":"affected","version":"< 1.6.9"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9c300e02fc68e7787b888874f1fbccca2cc2456cf96301d69b00ae234c9f40ff · sha256:dff24c11e9f3e80b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.3,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9c300e02fc68e7787b888874f1fbccca2cc2456cf96301d69b00ae234c9f40ff · sha256:dff24c11e9f3e80b… · /containers/cna/metrics/0/cvssV4_0

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:v2:9c300e02fc68e7787b888874f1fbccca2cc2456cf96301d69b00ae234c9f40ff · sha256:dff24c11e9f3e80b… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-203","description":"CWE-203: Observable Discrepancy","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9c300e02fc68e7787b888874f1fbccca2cc2456cf96301d69b00ae234c9f40ff · sha256:dff24c11e9f3e80b… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/authlib/authlib/commit/48b345f29f6c459f11c6a40162b6c0b742ef2e22","tags":["x_refsource_MISC"],"url":"https://github.com/authlib/authlib/commit/48b345f29f6c459f11c6a40162b6c0b742ef2e22"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c300e02fc68e7787b888874f1fbccca2cc2456cf96301d69b00ae234c9f40ff · sha256:dff24c11e9f3e80b… · /containers/cna/references/1
{"name":"https://github.com/authlib/authlib/releases/tag/v1.6.9","tags":["x_refsource_MISC"],"url":"https://github.com/authlib/authlib/releases/tag/v1.6.9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c300e02fc68e7787b888874f1fbccca2cc2456cf96301d69b00ae234c9f40ff · sha256:dff24c11e9f3e80b… · /containers/cna/references/2
{"name":"https://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78","tags":["x_refsource_CONFIRM"],"url":"https://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9c300e02fc68e7787b888874f1fbccca2cc2456cf96301d69b00ae234c9f40ff · sha256:dff24c11e9f3e80b… · /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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