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Fencer Vulns
high 7.4

CVE-2026-102272 json

PyJWT BOM Bypass

published 2026-09-28 41 d ago modified 2026-10-06 33 d ago also GHSA-r6x4-923q-g947 , PYSEC-2026-4150 , EUVD-2026-88540

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.prepare_key in jwt/algorithms.py is affected because raw-JWK detector does not normalize accepted Unicode byte-order marks before checking for JSON. This occurs when a public JWK is prefixed with a UTF-8 BOM and used in a mixed-algorithm verification path. As a result, public JWK bypasses asymmetric-key detection and becomes the HMAC secret. Consequently, an attacker who knows the public key can forge authenticated tokens. This issue is fixed in version 2.14.0.

Patch / fix

  • pypi pyjwt 2.14.0
  • pyjwt Debian 14 2.14.0-1

debian advisories DEBIAN-CVE-2026-102272

  • pyjwt Ubuntu 22.04 LTS 2.3.0-1ubuntu0.5
  • pyjwt Ubuntu 24.04 LTS 2.7.0-1ubuntu0.3
  • pyjwt Ubuntu 26.10 2.13.0-1ubuntu1
  • pyjwt Ubuntu 26.04 LTS 2.10.1-4ubuntu1.2
  • pyjwt Ubuntu Pro 16.04 LTS 1.3.0-1ubuntu0.1+esm3
  • pyjwt Ubuntu Pro 18.04 LTS 1.5.3+ds1-1ubuntu0.1+esm3
  • pyjwt Ubuntu Pro 20.04 LTS 1.7.1-2ubuntu2.1+esm3

ubuntu advisories UBUNTU-CVE-2026-102272

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-PyJWT openSUSE Tumbleweed 2.15.1-1.1

opensuse advisories openSUSE-SU-2026:11994-1

  • fence-virt AlmaLinux 9 4.10.0-110.el9_8.8
  • fence-agents-all AlmaLinux 9 4.10.0-110.el9_8.8
  • fence-agents-apc AlmaLinux 9 4.10.0-110.el9_8.8
  • fence-agents-aws AlmaLinux 9 4.10.0-110.el9_8.8
  • fence-agents-gce AlmaLinux 9 4.10.0-110.el9_8.8
  • fence-agents-rsa AlmaLinux 9 4.10.0-110.el9_8.8
  • ha-cloud-support AlmaLinux 9 4.10.0-110.el9_8.8
  • fence-agents-lpar AlmaLinux 9 4.10.0-110.el9_8.8

almalinux advisories ALSA-2026:94500ALSA-2026:94501

  • fence-agents Rocky Linux 10 4.16.0-21.el10_2.7
  • fence-agents Rocky Linux 9 4.10.0-110.el9_8.8

rocky linux advisories RLSA-2026:94501RLSA-2026:94500

  • python-jwt Azure Linux 3.0 2.15.1-1

azure linux advisories AZL-105224

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-102272 updated cvss 7.4

pyjwt: pyjwt: Token forgery via improper Unicode byte-order mark handling

  • Red Hat Ansible Automation Orchestrator 2026 ansible-automation-platform/automation-orchestrator-backend-rhel9 Red Hat Fence Agents Remediation Operator workload-availability/fence-agents-remediation-rhel9-operator Red Hat Lightspeed Core lightspeed-core/rag-tool-cpu-rhel9, lightspeed-core/lightspeed-stack-rhel9, lightspeed-core/rag-tool-cuda-12.9-rhel9 Red Hat Migration Toolkit for Applications 8 mta/mta-solution-server-rhel9 Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-27/hub-rhel9, ansible-automation-platform-26/mcp-tools-rhel9, ansible-automation-platform-27/mcp-tools-rhel9, ansible-automation-platform-27/ee-supported-rhel9, ansible-automation-platform-26/eda-controller-rhel9, +2 more
    affected: workaround, no fix available
  • Red Hat Ceph Storage 4 python2-jwt Red Hat Ceph Storage 7 rhceph/rhceph-7-rhel9 Red Hat Ceph Storage 9 rhceph/rhceph-9-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-ogx-core-rhel9, rhoai/odh-feature-server-rhel9, rhoai/odh-llm-d-kv-cache-rhel9, rhoai/odh-llama-stack-core-rhel9, rhoai/odh-th-torch-cuda-py312-rhel9, rhoai/odh-kserve-autogluon-server-rhel9, +17 more Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9 Red Hat Satellite 6 python-pyjwt, python3-pyjwt, python3.12-pyjwt Red Hat Update Infrastructure 5 rhui5/rhua-rhel9
    affected: workaround, no fix available
  • Red Hat AI Inference Server 3.5 rhaii/vllm-cpu-rhel9 1791473614, rhaii/vllm-cuda-rhel9 1791473631, rhaii/vllm-rocm-rhel9 1791425869, rhaii/vllm-gaudi-rhel9 1791427182, rhaii/vllm-spyre-rhel9 1791818357
    fixed: vendor fix RHSA-2026:82415
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26/gateway-rhel9 1791971533, ansible-automation-platform-26/lightspeed-rhel9 1791898403, ansible-automation-platform-26/ee-supported-rhel9 1791974220, ansible-automation-platform-tech-preview/metrics-service-rhel9 1791944819
    fixed: vendor fix RHSA-2026:87120
  • Red Hat Ansible Automation Platform 2.6 for RHEL 9 python3.12-pyjwt 2.14.0-1.el9ap, python3.12-pyjwt+crypto 2.14.0-1.el9ap
    fixed: vendor fix RHSA-2026:87004
  • Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/gateway-rhel9 1792429216, ansible-automation-platform-27/lightspeed-rhel9 1792141386, ansible-automation-platform-27/metrics-service-rhel9 1792387216, ansible-automation-platform-27/lightspeed-chatbot-rhel9 1792385971
    fixed: vendor fix RHSA-2026:87124
  • Red Hat Enterprise Linux AI 3.5 rhelai3/bootc-cuda-rhel9 1793135861, rhelai3/bootc-rocm-rhel9 1793135863, rhelai3/bootc-aws-cuda-rhel9 1793194817, rhelai3/bootc-gcp-cuda-rhel9 1793194815, rhelai3/disk-image-cuda-rhel9 1793206758, rhelai3/bootc-azure-cuda-rhel9 1793194815, +1 more
    fixed: vendor fix RHSA-2026:92452
show 16 more
  • Red Hat Enterprise Linux AppStream (v. 9) fence-virt 4.10.0-110.el9_8.8, fence-virtd 4.10.0-110.el9_8.8, fence-agents 4.10.0-110.el9_8.8, fence-virtd-cpg 4.10.0-110.el9_8.8, fence-virtd-tcp 4.10.0-110.el9_8.8, fence-agents-all 4.10.0-110.el9_8.8, +51 more
    fixed: vendor fix RHSA-2026:94500
  • Red Hat Enterprise Linux AppStream (v. 10) fence-virt 4.16.0-21.el10_2.7, fence-virtd 4.16.0-21.el10_2.7, fence-agents 4.16.0-21.el10_2.7, fence-virtd-cpg 4.16.0-21.el10_2.7, fence-virtd-tcp 4.16.0-21.el10_2.7, fence-agents-all 4.16.0-21.el10_2.7, +50 more
    fixed: vendor fix RHSA-2026:94501
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) fence-virt 4.10.0-43.el9_2.27, fence-virtd 4.10.0-43.el9_2.27, fence-agents 4.10.0-43.el9_2.27, fence-virtd-cpg 4.10.0-43.el9_2.27, fence-virtd-tcp 4.10.0-43.el9_2.27, fence-agents-virsh 4.10.0-43.el9_2.27, +8 more
    fixed: vendor fix RHSA-2026:94634
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) fence-virt 4.10.0-62.el9_4.31, fence-virtd 4.10.0-62.el9_4.31, fence-agents 4.10.0-62.el9_4.31, fence-virtd-cpg 4.10.0-62.el9_4.31, fence-virtd-tcp 4.10.0-62.el9_4.31, fence-agents-virsh 4.10.0-62.el9_4.31, +8 more
    fixed: vendor fix RHSA-2026:94557
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) fence-virt 4.16.0-5.el10_0.14, fence-virtd 4.16.0-5.el10_0.14, fence-agents 4.16.0-5.el10_0.14, fence-virtd-cpg 4.16.0-5.el10_0.14, fence-virtd-tcp 4.16.0-5.el10_0.14, fence-agents-all 4.16.0-5.el10_0.14, +50 more
    fixed: vendor fix RHSA-2026:95012
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) fence-virt 4.10.0-86.el9_6.23, fence-virtd 4.10.0-86.el9_6.23, fence-agents 4.10.0-86.el9_6.23, fence-virtd-cpg 4.10.0-86.el9_6.23, fence-virtd-tcp 4.10.0-86.el9_6.23, fence-agents-all 4.10.0-86.el9_6.23, +51 more
    fixed: vendor fix RHSA-2026:94523
  • Red Hat Enterprise Linux High Availability E4S (v.9.2) fence-agents-all 4.10.0-43.el9_2.27, fence-agents-apc 4.10.0-43.el9_2.27, fence-agents-aws 4.10.0-43.el9_2.27, fence-agents-eps 4.10.0-43.el9_2.27, fence-agents-gce 4.10.0-43.el9_2.27, fence-agents-rsa 4.10.0-43.el9_2.27, +37 more
    fixed: vendor fix RHSA-2026:94634
  • Red Hat Enterprise Linux High Availability E4S (v.9.4) fence-agents-all 4.10.0-62.el9_4.31, fence-agents-apc 4.10.0-62.el9_4.31, fence-agents-aws 4.10.0-62.el9_4.31, fence-agents-eps 4.10.0-62.el9_4.31, fence-agents-gce 4.10.0-62.el9_4.31, fence-agents-rsa 4.10.0-62.el9_4.31, +37 more
    fixed: vendor fix RHSA-2026:94557
  • Red Hat Enterprise Linux Resilient Storage E4S (v.9.2) fence-agents-all 4.10.0-43.el9_2.27, fence-agents-apc 4.10.0-43.el9_2.27, fence-agents-aws 4.10.0-43.el9_2.27, fence-agents-eps 4.10.0-43.el9_2.27, fence-agents-gce 4.10.0-43.el9_2.27, fence-agents-rsa 4.10.0-43.el9_2.27, +36 more
    fixed: vendor fix RHSA-2026:94634
  • Red Hat Enterprise Linux Resilient Storage E4S (v.9.4) fence-agents-all 4.10.0-62.el9_4.31, fence-agents-apc 4.10.0-62.el9_4.31, fence-agents-aws 4.10.0-62.el9_4.31, fence-agents-eps 4.10.0-62.el9_4.31, fence-agents-gce 4.10.0-62.el9_4.31, fence-agents-rsa 4.10.0-62.el9_4.31, +36 more
    fixed: vendor fix RHSA-2026:94557
  • Red Hat OpenShift AI 3.4 rhoai/odh-kserve-agent-rhel9 1792685313, rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9 1792798552
    fixed: vendor fix RHSA-2026:92510
  • Red Hat Satellite 6.18 satellite/foreman-mcp-server-rhel9 1793272276
    fixed: vendor fix RHSA-2026:92667
  • Red Hat Satellite 6.19 satellite/foreman-mcp-server-rhel9 1793272279
    fixed: vendor fix RHSA-2026:92666
  • Red Hat Trusted Artifact Signer 1.5 rhtas/rh-sigstore-a2a-rhel9 1793624122, rhtas/model-transparency-rhel9 1793696578
    fixed: vendor fix RHSA-2026:95261
  • Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-podvm-builder-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-ocp-rag-rhel9, openshift-lightspeed/lightspeed-service-api-rhel9, openshift-lightspeed/lightspeed-agentic-sandbox-rhel9, openshift-lightspeed/lightspeed-to-dataverse-exporter-rhel9 Red Hat AI Inference Server rhaii/vllm-tpu-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, rhaiis/vllm-cuda-rhel9, rhaiis/vllm-rocm-rhel9, rhaii/vllm-neuron-rhel9 Red Hat Ansible Automation Platform 2 python-pyjwt, python3x-pyjwt, python3.11-pyjwt, automation-controller, ansible-automation-platform-24/hub-rhel8, ansible-automation-platform-25/hub-rhel8, +15 more Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26/hub-rhel9 1791947385, ansible-automation-platform-26/hub-web-rhel9 1791952205, ansible-automation-platform-26/receptor-rhel9 1791968536, ansible-automation-platform-26/mcp-tools-rhel9 1791941340, ansible-automation-platform-26/controller-rhel9 1791947602, ansible-automation-platform-26/de-minimal-rhel9 1791961810, +21 more Red Hat Ansible Automation Platform 2.6 for RHEL 9 receptor 1.6.9-1.el9ap, molecule 26.10.0-1.el9ap, receptorctl 1.6.9-1.el9ap, ansible-lint 26.10.1-1.el9ap, ansible-rulebook 1.2.3-1.el9ap, automation-hub 4.11.15-1.el9ap, +50 more Red Hat Ansible Automation Platform 2.6 for RHEL 10 receptor 1.6.9-1.el10ap, molecule 26.10.0-1.el10ap, python-cffi 2.0.0-2.el10ap, receptorctl 1.6.9-1.el10ap, python3-cffi 2.0.0-2.el10ap, ansible-lint 26.10.1-1.el10ap, +11 more
    +2 more products
    Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/hub-rhel9 1792388670, ansible-automation-platform-27/hub-web-rhel9 1792394496, ansible-automation-platform-27/receptor-rhel9 1792139928, ansible-automation-platform-27/mcp-tools-rhel9 1792425046, ansible-automation-platform-27/controller-rhel9 1792389457, ansible-automation-platform-27/de-minimal-rhel9 1792141111, +23 more Red Hat Enterprise Linux 8 rhel8/support-tools
    not affected: vulnerable code not present

15 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
40 d ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/jpadilla/pyjwt/security/advisories/GHSA-r6x4-923q-g947 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
OSV 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi pyjwt
>=2.13.0, <2.14.0
2.14.0

Affected products

  • jpadilla pyjwt

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.