CVE-2026-101917

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Source
https://cve.org/CVERecord?id=CVE-2026-101917
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-101917.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-101917
Aliases
Downstream
AZL (1)
BELL (1)
CGA (142)
CLEANSTART (4)
CLSA (3)
DEBIAN (1)
ECHO (1)
MINI (25)
OESA (3)
openSUSE (2)
SUSE (5)
UBUNTU (1)
Related
openSUSE (2)
SUSE (5)
Published
2026-09-28T20:07:44Z
Modified
2026-11-03T22:56:56Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
PyJWT: PyJWKClient still amplifies unauthenticated JWKS fetches on unknown kid values (incomplete fix of CVE-2026-48524)
Details

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT get_signing_key_from_jwt is affected because unknown kid misses force refreshes without a negative cache or minimum refresh interval. This occurs when unauthenticated tokens repeatedly use the same unknown kid or varying kid values absent from the cached JWKS. As a result, each cache miss causes PyJWKClient to refresh the JWKS. Consequently, attacker traffic can amplify outbound requests to the configured JWKS endpoint. This issue is fixed in version 2.14.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101917.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
c6fe464b356ff4b1ebc9ba62172d331a40aa27df
Fixed
ba4853a75fb9676362da17f67d0f64bd18afd4e1
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "2.14.0"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "range": [
                {
                    "fixed": "ba4853a75fb9676362da17f67d0f64bd18afd4e1"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "2.14.0",
            "range": [
                {
                    "fixed": "c6fe464b356ff4b1ebc9ba62172d331a40aa27df"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

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
2.13.0
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/cve-osv-conversion/osv-output/CVE-2026-101917.json"