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PyJWT CVE-2026-102273

| EUVDEUVD-2026-88541 HIGH
Improper Verification of Cryptographic Signature (CWE-347)
2026-09-28 GitHub_M GHSA-w2cx-738m-mc7w
Authentication Bypass Python Jwt Attack Pyjwt Jpadilla
7.4
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.4 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
7.4 HIGH

AC:H because exploitation needs a specific HMAC+asymmetric config passing a JWK container as raw key; PR:N/UI:N since forging a token needs only the public key; C:H/I:H from full claim forgery.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.4 HIGH
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

6
POC Analysis Generated
Sep 28, 2026 - 23:23 vuln.today
Patch available
Sep 28, 2026 - 22:02 EUVD
Metadata Corrected
Sep 28, 2026 - 21:40 vuln.today
tag: Authentication Bypass added
Metadata Corrected
Sep 28, 2026 - 21:40 vuln.today
tag: Information Disclosure removed
Analysis Generated
Sep 28, 2026 - 21:16 vuln.today
CVE Published
Sep 28, 2026 - 20:38 cve.org
HIGH 7.4

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 206 pypi packages depend on pyjwt (131 direct, 76 indirect)

Ecosystem-wide dependent count for version 2.13.0.

DescriptionCVE.org

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because HMAC key guard only recognizes top-level public JWK forms and misses container representations. This occurs when an application allows HMAC and asymmetric algorithms and passes a public JWK container as the raw key. As a result, public asymmetric key material is accepted as the HMAC secret. Consequently, an attacker who knows the public key can forge a token with arbitrary authenticated claims. This issue is fixed in version 2.14.0.

Articles & Coverage 1

News 13 New Python Vulnerabilities - 2 Critical, 11 High, 2 With POC Sep 29, 2026

AnalysisAI

Signature forgery in PyJWT 2.13.0 lets an attacker forge arbitrary JWT claims when an application verifies tokens using both HMAC and asymmetric algorithms and hands a public JWK container (a JWKS document, a bare array, a nested array, or a BOM-prefixed variant) directly to the library as the raw key. Because the version 2.13.0 HMAC key guard only recognizes top-level public JWK objects and misses these container wrappers, public asymmetric key material - which is not secret - is accepted as the HMAC secret, so anyone who knows the target's public key can sign a token with any claims and have it validate. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires a specific, non-default application design: the app must (1) be running PyJWT 2.13.0, (2) permit both HMAC (e.g. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine authentication-bypass / signature-forgery flaw (CWE-347) but with a narrow trigger, so it sits below its 7.4 headline score in real-world urgency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade PyJWT to version 2.14.0 or later - the only vendor-released fix, addressed by commit 801cd128528c62d9b23fcd161d1a2e1c17982f95 and published as release 2.14.0 - using pip install --upgrade 'pyjwt>=2.14.0' and pinning the floor in requirements.txt/pyproject.toml (also verify transitive dependents such as auth SDKs and API gateways do not hold the library back); see the advisory at https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w2cx-738m-mc7w. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory every Python service, virtual environment, and container image resolving PyJWT to version 2.13.0 (pip freeze | grep -i pyjwt, pip show pyjwt, or SBOM/SCA queries) and inspect each token-verification path for the two preconditions: one code path accepting both HMAC (HS256/HS384/HS512) and asymmetric (RS/ES/PS) algorithms, and a raw key passed to jwt.decode as a JWKS document, bare JWK array, nested array, or BOM-prefixed variant; where both exist, immediately narrow the algorithms parameter to a single explicitly expected algorithm and stop passing key containers. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 12 Not-Affected
SUSE Linux Enterprise Micro 5.5 Not-Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Python 3 15 SP7 Not-Affected

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CVE-2026-102273 vulnerability details – vuln.today
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