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)
CGA (142)
CLEANSTART (2)
CLSA (3)
DEBIAN (1)
ECHO (1)
MINI (25)
openSUSE (2)
SUSE (2)
UBUNTU (1)
Related
openSUSE (2)
SUSE (2)
Published
2026-09-28T20:07:44Z
Modified
2026-10-20T11:15:35Z
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"