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CVE-2026-49852

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.6.8, joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None, because HMACAlgorithm.sign and HMACAlgorithm.verify in src/joserfc/_rfc7518/jws_algs.py pass the output of OctKey.get_op_key(...) to hmac.new(...) and OctKey.import_key in src/joserfc/_rfc7518/oct_key.py only emits a SecurityWa
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0169a9e68e1edeeaa4fec83ac986c4371a4c22dc841e440c987e40481f61c07c
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-1391","description":"CWE-1391: Use of Weak Credentials","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-326","description":"CWE-326: Inadequate Encryption Strength","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"joserfc","vendor":"authlib","versions":[{"status":"affected","version":"< 1.6.8"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

3 source assertions
{"cweId":"CWE-1391","description":"CWE-1391: Use of Weak Credentials","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-326","description":"CWE-326: Inadequate Encryption Strength","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/authlib/joserfc/commit/86d00910b2b2d2d07503fee9b572906daefab7f1","tags":["x_refsource_MISC"],"url":"https://github.com/authlib/joserfc/commit/86d00910b2b2d2d07503fee9b572906daefab7f1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/cna/references/1
{"name":"https://github.com/authlib/joserfc/releases/tag/1.6.8","tags":["x_refsource_MISC"],"url":"https://github.com/authlib/joserfc/releases/tag/1.6.8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://github.com/authlib/joserfc/security/advisories/GHSA-gg9x-qcx2-xmrh"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /containers/adp/0/references/0
{"name":"https://github.com/authlib/joserfc/security/advisories/GHSA-gg9x-qcx2-xmrh","tags":["x_refsource_CONFIRM"],"url":"https://github.com/authlib/joserfc/security/advisories/GHSA-gg9x-qcx2-xmrh"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c8e894a83d149763729572e1faf2c87633011b2dd0f582f8efc0b5e36a15648 · sha256:33d6c5ee015b4757… · /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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