CVE-2026-103001

PyJWT is a Python implementation of JSON Web Token standards. From 2.11.0 through 2.13.0, PyJWT's PyJWT._merge_options() method can modify a caller-supplied mutable options mapping when verify_signature is false. If an application reuses that same mapping for a later decode() or decode_complete() call and changes verify_signature to true, the mapping can retain false values for expiration, not-before, issued-at, audience, issuer, subject, and JWT ID checks. A signed token with invalid registered claims can then be accepted without disabling signature verification, but applications that create a fresh options mapping for each call are not affected.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-471"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103001.json"
}

References

Affected packages

Git / github.com/jpadilla/pyjwt

Affected ranges

Type

GIT

Repo

https://github.com/jpadilla/pyjwt

Events

Introduced

697344d25990641b8b2aa85f0a60634b590b5702

Fixed

7144e4534c34810f4525dc4578a32addd8212cff

Fixed

0c87c8c8b1a74cac99ad8115f3050efcb7fbed35

Database specific

Show details

{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "2.11.0"
                },
                {
                    "fixed":  "2.13.0"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "0c87c8c8b1a74cac99ad8115f3050efcb7fbed35"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

2.*

2.11.0

2.12.0

2.12.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103001.json"