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Fencer Intel
medium 5.9

CVE-2026-92091 json

Jwcrypto: jwcrypto: denial of service via o(n^2) duplicate check on unbounded jwk key_ops array

published last mo. modified 19h ago also EUVD-2026-80228 , GHSA-pwgw-f7xr-863h

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository latchset/jwcrypto. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

A flaw was found in jwcrypto. The JWK.import_key() function validates the key_ops JWK member for duplicate values using an algorithm with O(n^2) time complexity, and the length of key_ops is not bounded. A remote, unauthenticated attacker can supply a JWK with a large key_ops array to an application that passes attacker-controlled key material to a public key-import API (reachable via ECDH-ES key agreement, OIDC dynamic client registration, DPoP, or ACME account key registration, among others) to consume excessive CPU time, resulting in a denial of service.

Patch / fix

  • pypi jwcrypto 1.6.1
  • Red Hat Red Hat Enterprise Linux 10 0:1.6.1-1.el10_3
  • Red Hat Red Hat Enterprise Linux 9 0:1.6.1-1.el9_9
  • python-jwcrypto SLES for SAP applications 16.0, SLES 16.0 1.5.6-160000.5.1

suse advisories SUSE-SU-2026:24218-1

  • python-jwcrypto openSUSE Leap 16.0 1.5.6-160000.5.1
  • python-jwcrypto openSUSE Tumbleweed 1.6.1-1.1

opensuse advisories openSUSE-SU-2026:22073-1openSUSE-SU-2026:11972-1

Is CVE-2026-92091 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-92091 updated cvss 5.9

jwcrypto: jwcrypto: denial of service via O(n^2) duplicate check on unbounded JWK key_ops array

  • Red Hat Ansible Automation Platform 2 python3.11-jwcrypto, python3.12-jwcrypto, automation-controller, ansible-automation-platform-25/gateway-rhel8, ansible-automation-platform-26/gateway-rhel9, ansible-automation-platform-27/gateway-rhel9, +7 more Red Hat Enterprise Linux 7 python-jwcrypto 0.4.2-1.el7 Red Hat Enterprise Linux 8 python-jwcrypto, python3-jwcrypto Red Hat OpenShift AI (RHOAI) rhoai/odh-feature-server-rhel9, rhoai/odh-kserve-storage-initializer-rhel9 Red Hat OpenStack Platform 16.2 rhosp-rhel8/openstack-tempest, rhosp-rhel8/openstack-nova-api, rhosp-rhel8/openstack-novajoin-base, rhosp-rhel8/openstack-tripleoclient, rhosp-rhel8/openstack-novajoin-server, rhosp-rhel8/openstack-mistral-executor, +2 more Red Hat OpenStack Platform 17.1 rhosp-rhel9/openstack-tempest, rhosp-rhel9/openstack-nova-api, rhosp-rhel9/openstack-novajoin-base, rhosp-rhel9/openstack-tripleoclient, rhosp-rhel9/openstack-novajoin-server, rhosp-rhel9/openstack-novajoin-notifier, +1 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 9) python-jwcrypto 1.6.1-1.el9_9, python3-jwcrypto 1.6.1-1.el9_9
    fixed: vendor fix RHSA-2026:97858
  • Red Hat Enterprise Linux AppStream (v. 10) python-jwcrypto 1.6.1-1.el10_3, python3-jwcrypto 1.6.1-1.el10_3
    fixed: vendor fix RHSA-2026:98061

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
partial
Assessed
last mo.

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/latchset/jwcrypto/security/advisories/GHSA-pwgw-f7xr-863h referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi jwcrypto
<=1.6.0
1.6.1

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Ansible Automation Platform 2
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat OpenStack Platform 16.2
  • Red Hat Red Hat OpenStack Platform 17.1

Classification

Weakness
  • CWE-407 Inefficient Algorithmic Complexity

References

Sources

Fencer Intel 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.

The maintainers of latchset/jwcrypto published their own advisory on GitHub. Reviewed sources take precedence over it.