Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | python-jwcrypto | No fix yet | — |
| Debian 13 | python-jwcrypto | No fix yet | — |
| Debian 12 | python-jwcrypto | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | python-jwcrypto | No fix yet | — |
| Ubuntu 26.04 LTS | python-jwcrypto | No fix yet | — |
| Ubuntu 24.04 LTS | python-jwcrypto | No fix yet | — |
| Ubuntu 22.04 LTS | python-jwcrypto | No fix yet | — |
| Ubuntu 20.04 LTS | python-jwcrypto | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | python-jwcrypto | No fix yet | — |
| Ubuntu 16.04 LTS | python-jwcrypto | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | python-jwcrypto | 1.5.6-160000.5.1 | SUSE-SU-2026:24218-1 |
| SLES 16.0 | python-jwcrypto | 1.5.6-160000.5.1 | SUSE-SU-2026:24218-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-jwcrypto | 1.6.1-1.1 | openSUSE-SU-2026:11972-1 |
| openSUSE Leap 16.0 | python-jwcrypto | 1.5.6-160000.5.1 | openSUSE-SU-2026:22073-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | python3-jwcrypto | 1.4.2-46.amzn2023.0.2 | ALAS2023-2026-3158 |
| Amazon Linux 2 | python-jwcrypto | 0.4.2-1.amzn2.0.4 | ALAS2-2026-3968 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | python-jwcrypto | No fix yet | — |
Advisories 6
- WID-SEC-2026-4472 Red Hat Enterprise Linux (python-jwcrypto, sos, hickory-resolver, libimobiledevice, gcc, python-oauthlib): Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- SUSE-SU-2026:24218-1 Security update for python-jwcrypto SUSE / openSUSE Security Updates · Oct 21, 2026
- openSUSE-SU-2026:22073-1 Security update for python-jwcrypto SUSE / openSUSE Security Updates · Oct 19, 2026
- ALAS2-2026-3968 Important: python-jwcrypto security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- ALAS2023-2026-3158 Important: python-jwcrypto security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- openSUSE-SU-2026:11972-1 python313-jwcrypto-1.6.1-1.1 on GA media SUSE / openSUSE Security Updates · Oct 3, 2026
References
- RHSA-2026:97858 vendor-advisory
- RHSA-2026:98061 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-92091 vdb-entry
- RHBZ#2533849 issue-tracking
- https://github.com/latchset/jwcrypto/security/advisories/GHSA-pwgw-f7xr-863h