CVE-2026-48526

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Source
https://cve.org/CVERecord?id=CVE-2026-48526
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-48526.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-48526
Aliases
Downstream
Related
Published
2026-05-28T15:09:09.258Z
Modified
2026-06-24T18:29:20.587212378Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed
Details

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-287",
        "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48526.json"
}
References

Affected packages

Git / github.com/jpadilla/pyjwt

Affected ranges

Type
GIT
Repo
https://github.com/jpadilla/pyjwt
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
7144e4534c34810f4525dc4578a32addd8212cff
Database specific 
{
    "cpe": "cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.13.0"
        },
        {
            "introduced": "0"
        },
        {
            "fixed": "2.13.0"
        }
    ]
}

Affected versions

0.*
0.1.6
0.1.9
0.2.0
0.2.2
0.2.3
0.3.0
0.3.1
0.3.2
0.4.0
0.4.1
0.4.2
0.4.3
1.*
1.0.0
1.0.1
1.1.0
1.2.0
1.3.0
1.4.0
1.4.1
1.4.2
1.5.0
1.5.1
1.5.2
1.5.3
1.6.0
1.6.1
1.6.3
1.6.4
1.7.0
1.7.1
2.*
2.0.0
2.0.0a1
2.0.0a2
2.0.1
2.1.0
2.10.0
2.10.1
2.11.0
2.12.0
2.12.1
2.2.0
2.3.0
2.4.0
2.5.0
2.6.0
2.7.0
2.8.0
2.9.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-48526.json"