CVE-2026-102272

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Source
https://cve.org/CVERecord?id=CVE-2026-102272
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102272.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-102272
Aliases
Downstream
CGA (114)
DEBIAN (1)
ECHO (1)
MINI (3)
UBUNTU (1)
Published
2026-09-28T20:36:31Z
Modified
2026-09-30T03:47:05Z
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 BOM Bypass
Details

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.prepare_key in jwt/algorithms.py is affected because raw-JWK detector does not normalize accepted Unicode byte-order marks before checking for JSON. This occurs when a public JWK is prefixed with a UTF-8 BOM and used in a mixed-algorithm verification path. As a result, public JWK bypasses asymmetric-key detection and becomes the HMAC secret. Consequently, an attacker who knows the public key can forge authenticated tokens. This issue is fixed in version 2.14.0.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-347"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102272.json"
}
References

Affected packages

Git / github.com/jpadilla/pyjwt

Affected ranges

Type
GIT
Repo
https://github.com/jpadilla/pyjwt
Events
Introduced
7144e4534c34810f4525dc4578a32addd8212cff
Fixed
180783930de91876bc0d601f826a1f2956057291
Fixed
c6fe464b356ff4b1ebc9ba62172d331a40aa27df
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "2.13.0"
        },
        {
            "fixed":  "2.14.0"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

2.*
2.13.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102272.json"