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CVE-2025-62706

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JWE zip=DEF path performs unbounded DEFLATE decompression. A very small ciphertext can expand into tens or hundreds of megabytes on decrypt, allowing an attacker who can supply decryptable tokens to exhaust memory and CPU and cause denial of service. This issue has been patched in version 1.6.5. Workarounds for this issue involve rejecting or stripping zip=DEF for inbound JWEs at the appl
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:968bcd66c2d45ffa2eed563634b4dca33da4dd2658fca6d75e717bf8aa45e1a3
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-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7cd78926e3e4b866efb8d3194263ae92d4969152e0bec2d991169f18d29007da · sha256:d95fbdfa4e87bfda… · /containers/cna/problemTypes/0/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:v2:7cd78926e3e4b866efb8d3194263ae92d4969152e0bec2d991169f18d29007da · sha256:d95fbdfa4e87bfda… · /containers/cna/problemTypes/1/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:v2:7cd78926e3e4b866efb8d3194263ae92d4969152e0bec2d991169f18d29007da · sha256:d95fbdfa4e87bfda… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/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:v2:7cd78926e3e4b866efb8d3194263ae92d4969152e0bec2d991169f18d29007da · sha256:d95fbdfa4e87bfda… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7cd78926e3e4b866efb8d3194263ae92d4969152e0bec2d991169f18d29007da · sha256:d95fbdfa4e87bfda… · /containers/cna/problemTypes/0/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:v2:7cd78926e3e4b866efb8d3194263ae92d4969152e0bec2d991169f18d29007da · sha256:d95fbdfa4e87bfda… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/authlib/authlib/commit/e0863d5129316b1790eee5f14cece32a03b8184d","tags":["x_refsource_MISC"],"url":"https://github.com/authlib/authlib/commit/e0863d5129316b1790eee5f14cece32a03b8184d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7cd78926e3e4b866efb8d3194263ae92d4969152e0bec2d991169f18d29007da · sha256:d95fbdfa4e87bfda… · /containers/cna/references/1
{"name":"https://github.com/authlib/authlib/security/advisories/GHSA-g7f3-828f-7h7m","tags":["x_refsource_CONFIRM"],"url":"https://github.com/authlib/authlib/security/advisories/GHSA-g7f3-828f-7h7m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7cd78926e3e4b866efb8d3194263ae92d4969152e0bec2d991169f18d29007da · sha256:d95fbdfa4e87bfda… · /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:v2:7cd78926e3e4b866efb8d3194263ae92d4969152e0bec2d991169f18d29007da · sha256:d95fbdfa4e87bfda… · /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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