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PyJWT CVE-2026-102267

| EUVDEUVD-2026-88534 CRITICAL
Information Exposure (CWE-200)
2026-09-28 GitHub_M GHSA-9v7f-9g4p-ffgj
Python Information Disclosure Pyjwt Jpadilla
9.1
CVSS 3.1 · NVD
Temporal: 7.4
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Severity by source

Vendor (GitHub_M) PRIMARY
HIGH
qualitative
NVD
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CIRCL (temporal)
7.4 HIGH
cvss
vuln.today AI
7.4 HIGH

Remote and unauthenticated (AV:N/PR:N), but AC:H because it requires an attacker-influenced redirect from the trusted endpoint plus header-forwarding/mixed config; header leak gives C:H and key substitution gives I:H, no availability impact.

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

Primary rating from Vendor (GitHub_M).

CVSS VectorNVD

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

Lifecycle Timeline

8
Analysis Updated
Oct 07, 2026 - 20:43 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Oct 07, 2026 - 20:37 vuln.today
cvss_changed
Severity Changed
Oct 07, 2026 - 20:37 NVD
HIGH CRITICAL
CVSS changed
Oct 07, 2026 - 20:37 NVD
7.4 (HIGH) 9.1 (CRITICAL)
POC Analysis Generated
Sep 28, 2026 - 23:24 vuln.today
Patch available
Sep 28, 2026 - 22:02 EUVD
Analysis Generated
Sep 28, 2026 - 21:00 vuln.today
CVE Published
Sep 28, 2026 - 20:23 cve.org
HIGH 7.4

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 18 pypi packages depend on pyjwt (16 direct, 2 indirect)

Ecosystem-wide dependent count for version 2.14.0.

DescriptionNVD

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT PyJWKClient is affected because redirect destinations are not revalidated against the JWKS trust boundary. This occurs when a configured trusted JWKS endpoint returns an attacker-influenced redirect. As a result, PyJWKClient follows the redirect and consumes the redirected response as key material. Consequently, forwarded credentials may be disclosed or verification keys may be substituted. 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

JWKS trust-boundary bypass in PyJWT's PyJWKClient allows a configured trusted JWKS endpoint that returns an HTTP 3xx redirect to steer the client to an attacker-chosen host, which is then consumed as authoritative key material; the same mechanism can forward caller-supplied request headers such as Authorization to that destination. Only PyJWT 2.13.0 and earlier are affected (fixed in 2.14.0), and exploitation is not unconditional: it requires the application to actually use PyJWKClient for remote JWKS fetching, attacker influence over the trusted endpoint's redirect response, and - for credential leakage - caller-supplied headers passed into the client, or - for forged-JWT acceptance - a mixed-configuration deployment. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation is NOT unconditional despite PR:N. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals conflict sharply. … 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 Vendor-released patch: PyJWT 2.14.0 (released 2026-09-11), the first release containing commit 0a795b8e1f6ef08f634aa7086fc41cc6d5ce3e56, which disables automatic redirects in PyJWKClient; upgrade with 'pip install --upgrade PyJWT==2.14.0' or a pinned later 2.x, and verify the resolved version in your lockfile since transitive dependencies may pin older releases. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify every service or library dependency pinned to PyJWT 2.13.0 or earlier and confirm which of them actually invoke PyJWKClient for remote JWKS retrieval; prioritize internet-facing and identity-adjacent workloads, and treat any deployment that both fetches remote JWKS and passes caller-supplied headers into the client as the highest priority. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 Affected
SUSE Linux Enterprise Micro 5.5 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Python 3 15 SP7 Affected

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CVE-2026-102267 vulnerability details – vuln.today
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