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CVE-2025-61920

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JOSE implementation accepts unbounded JWS/JWT header and signature segments. A remote attacker can craft a token whose base64url‑encoded header or signature spans hundreds of megabytes. During verification, Authlib decodes and parses the full input before it is rejected, driving CPU and memory consumption to hostile levels and enabling denial of service. Version 1.6.5 patches the issue. S
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:61dee2a4f7399d30ba5edea2fbd68242ba8aadf87908e0f2cd2b923c4d8567a4
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"authlib","vendor":"authlib","versions":[{"status":"affected","version":"< 1.6.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/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:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/authlib/authlib/commit/867e3f87b072347a1ae9cf6983cc8bbf88447e5e","tags":["x_refsource_MISC"],"url":"https://github.com/authlib/authlib/commit/867e3f87b072347a1ae9cf6983cc8bbf88447e5e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/cna/references/1
{"name":"https://github.com/authlib/authlib/security/advisories/GHSA-pq5p-34cr-23v9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/authlib/authlib/security/advisories/GHSA-pq5p-34cr-23v9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/cna/references/0
{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00032.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d03cc7fd74b0475b22cef14b552ecbe07e4c9f7875ee293f38b5e87efc6534b · sha256:a81979427c101cee… · /containers/adp/1/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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