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Vulnerability details: VCID-42yf-7k7m-dkf6
Vulnerability ID VCID-42yf-7k7m-dkf6
Aliases CVE-2017-11424
GHSA-r9jw-mwhq-wp62
PYSEC-2017-24
Summary In PyJWT 1.5.0 and below the `invalid_strings` check in `HMACAlgorithm.prepare_key` does not account for all PEM encoded public keys. Specifically, the PKCS1 PEM encoded format would be allowed because it is prefaced with the string `-----BEGIN RSA PUBLIC KEY-----` which is not accounted for. This enables symmetric/asymmetric key confusion attacks against users using the PKCS1 PEM encoded public keys, which would allow an attacker to craft JWTs from scratch.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-11424.json
epss 0.00193 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.00193 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.00847 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.00847 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.01288 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.01288 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.01288 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.01288 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.01288 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.01288 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.01288 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.01288 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
epss 0.01288 https://api.first.org/data/v1/epss?cve=CVE-2017-11424
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-r9jw-mwhq-wp62
cvssv3.1 7.5 https://github.com/jpadilla/pyjwt
generic_textual HIGH https://github.com/jpadilla/pyjwt
cvssv3.1 7.5 https://github.com/jpadilla/pyjwt/pull/277
generic_textual HIGH https://github.com/jpadilla/pyjwt/pull/277
cvssv3.1 7.5 https://github.com/pypa/advisory-database/tree/main/vulns/pyjwt/PYSEC-2017-24.yaml
generic_textual HIGH https://github.com/pypa/advisory-database/tree/main/vulns/pyjwt/PYSEC-2017-24.yaml
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2017-11424
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2017-11424
cvssv3.1 7.5 http://www.debian.org/security/2017/dsa-3979
generic_textual HIGH http://www.debian.org/security/2017/dsa-3979
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-11424.json
https://api.first.org/data/v1/epss?cve=CVE-2017-11424
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11424
https://github.com/advisories/GHSA-r9jw-mwhq-wp62
https://github.com/jpadilla/pyjwt
https://github.com/jpadilla/pyjwt/pull/277
https://github.com/pypa/advisory-database/tree/main/vulns/pyjwt/PYSEC-2017-24.yaml
http://www.debian.org/security/2017/dsa-3979
1482529 https://bugzilla.redhat.com/show_bug.cgi?id=1482529
873244 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=873244
CVE-2017-11424 https://nvd.nist.gov/vuln/detail/CVE-2017-11424
USN-3407-1 https://usn.ubuntu.com/3407-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-11424.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://github.com/jpadilla/pyjwt
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://github.com/jpadilla/pyjwt/pull/277
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/pyjwt/PYSEC-2017-24.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-11424
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at http://www.debian.org/security/2017/dsa-3979
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.41021
EPSS Score 0.00193
Published At April 26, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:41:32.401641+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/pyjwt/PYSEC-2017-24.yaml 38.0.0