PyJWT: Asymmetric-PEM detection bypass: whitespace/line-ending-mutated public keys skip the HS/asymmetric confusion guard
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| jpadilla | pyjwt | affected |
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| Jpadilla | Pyjwt |
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| Source | ID | Title |
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Github GHSA |
GHSA-ffc3-869f-jxw9 | PyJWT: Asymmetric-PEM detection bypass: whitespace/line-ending-mutated public keys skip the HS/asymmetric confusion guard |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.236% probability within 30 days)
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| First Time appeared |
Pyjwt Project
Pyjwt Project pyjwt |
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| CPEs | cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Pyjwt Project
Pyjwt Project pyjwt |
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| Metrics |
ssvc
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| First Time appeared |
Jpadilla
Jpadilla pyjwt |
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| Vendors & Products |
Jpadilla
Jpadilla pyjwt |
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| Description | PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0. | |
| Title | PyJWT: Asymmetric-PEM detection bypass: whitespace/line-ending-mutated public keys skip the HS/asymmetric confusion guard | |
| Weaknesses | CWE-347 | |
| References |
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| Metrics |
cvssV3_1
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