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Fencer Vulns
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 2026-09-16 53 d ago modified 2026-11-06 3 d ago also EUVD-2026-80228

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

  • 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

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 Red Hat Enterprise Linux 8 python-jwcrypto, python3-jwcrypto Red Hat Enterprise Linux 9 python-jwcrypto, python3-jwcrypto
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 10 python-jwcrypto
    affected: workaround, no fix available
  • 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 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
53 d ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 products

  • Red Hat Red Hat Ansible Automation Platform 2
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • 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 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.