CVE-2026-85394

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Source
https://cve.org/CVERecord?id=CVE-2026-85394
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85394.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-85394
Aliases
Downstream
Published
2026-09-03T18:54:26.563Z
Modified
2026-09-05T03:48:30.987849129Z
Severity
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
python-jose through 3.5.0 Algorithm Confusion via DER-encoded Public Key as HMAC Secret
Details

python-jose through 3.5.0 fails to properly validate asymmetric keys in HMAC initialization, accepting DER-encoded public keys that lack PEM armor or SSH prefixes. Attackers holding the service's public key can forge HS256 tokens that pass verification when algorithms are not explicitly restricted. This is an incomplete fix for CVE-2024-33663.

Database specific 
{
    "cwe_ids": [
        "CWE-347"
    ],
    "cna_assigner": "VulnCheck",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85394.json"
}
References

Affected packages

Git / github.com/mpdavis/python-jose

Affected ranges

Type
GIT
Repo
https://github.com/mpdavis/python-jose
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
018b310ddb8b50dcfd09a0c152117835a21dd656
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "3.5.0"
        },
        {
            "fixed": "3.5.0"
        }
    ]
}

Affected versions

0.*
0.5.3
0.5.5
0.5.6
0.6.0
0.6.1
0.6.2
0.7.0
1.*
1.0.0
1.1.0
1.2.0
1.3.0
1.3.1
1.3.2
1.4.0
2.*
2.0.1
2.0.2
3.*
3.0.0
3.0.1
3.1.0
3.2.0
3.3.0
3.4.0
v0.*
v0.1.5
v0.2.0
v0.5.1
v0.5.2
v0.5.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85394.json"