Description
A flaw was found in the jwcrypto library, which is used for implementing Javascript Object Signing and Encryption (JOSE) standards. The issue occurs when the library verifies a General JSON Serialization JWS using a set of keys. Due to a coding error, the library fails to correctly identify the specific key ID (kid) and may instead accept a signature made by any valid key in the set. This can allow an attacker with a valid key to bypass authorization checks in applications that rely on the key ID to identify specific tenants or users.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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 | — | — |
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 | — |
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 | 1.5.6-160000.4.1 | SUSE-SU-2026:23722-1, SUSE-SU-2026:23702-1 |
| SLES 16.0 | python-jwcrypto | 1.5.6-160000.4.1 | SUSE-SU-2026:23722-1, SUSE-SU-2026:23702-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-jwcrypto | 1.6.0-1.1 | openSUSE-SU-2026:11712-1 |
| openSUSE Leap 16.0 | python-jwcrypto | 1.5.6-160000.4.1 | openSUSE-SU-2026:21827-1 |
Advisories 4
- SUSE-SU-2026:23722-1 Security update for python-jwcrypto SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:23702-1 Security update for python-jwcrypto SUSE / openSUSE Security Updates · Sep 29, 2026
- openSUSE-SU-2026:21827-1 Security update for python-jwcrypto SUSE / openSUSE Security Updates · Sep 12, 2026
- openSUSE-SU-2026:11712-1 python313-jwcrypto-1.6.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 8, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-84185 vdb-entry
- RHBZ#2526729 issue-tracking