ALSA-2026:94500: Critical: fence-agents security update

Published Nov 3, 2026
·
Updated

The fence-agents packages provide a collection of scripts for handling remote power management for cluster devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster.

Security Fix(es):

pyjwt: pyjwt: Authentication bypass via empty HMAC key acceptance (CVE-2026-102266) pyjwt: PyJWT: Authentication bypass via improper public key validation (CVE-2026-102268) pyjwt: PyJWT: Authentication bypass via acceptance of DER public keys as HMAC secrets (CVE-2026-102271) pyjwt: pyjwt: Verification key substitution via unvalidated JWKS redirects (CVE-2026-102267) pyjwt: pyjwt: Token forgery via improper Unicode byte-order mark handling (CVE-2026-102272)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Affected Software

37 affected componentsFixes available
almalinux/fence-agents-aliyun<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-all<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-amt-ws<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-apc<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-apc-snmp<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-aws<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-azure-arm<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-bladecenter<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-cisco-ucs<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-common<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-compute<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-drac5<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-gce<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-hpblade<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-ibm-powervs<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-ibm-vpc<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-ibmblade<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-ifmib<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-ilo-moonshot<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-ilo-mp<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-kdump<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-kubevirt<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-lpar<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-mpath<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-nutanix-ahv<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-openstack<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-redfish<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-rhevm<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-rsa<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-scsi<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-virsh<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-agents-vmware-rest<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-virt<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-virtd-libvirt<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-virtd-multicast<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/fence-virtd-serial<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8
almalinux/ha-cloud-support<4.10.0-110.el9_8.8
4.10.0-110.el9_8.8

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade almalinux/fence-agents-aliyun to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  2. Upgrade

    Upgrade almalinux/fence-agents-all to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  3. Upgrade

    Upgrade almalinux/fence-agents-amt-ws to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  4. Upgrade

    Upgrade almalinux/fence-agents-apc to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  5. Upgrade

    Upgrade almalinux/fence-agents-apc-snmp to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  6. Upgrade

    Upgrade almalinux/fence-agents-aws to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  7. Upgrade

    Upgrade almalinux/fence-agents-azure-arm to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  8. Upgrade

    Upgrade almalinux/fence-agents-bladecenter to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  9. Upgrade

    Upgrade almalinux/fence-agents-cisco-ucs to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  10. Upgrade

    Upgrade almalinux/fence-agents-common to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  11. Upgrade

    Upgrade almalinux/fence-agents-compute to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  12. Upgrade

    Upgrade almalinux/fence-agents-drac5 to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  13. Upgrade

    Upgrade almalinux/fence-agents-gce to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  14. Upgrade

    Upgrade almalinux/fence-agents-hpblade to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  15. Upgrade

    Upgrade almalinux/fence-agents-ibm-powervs to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  16. Upgrade

    Upgrade almalinux/fence-agents-ibm-vpc to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  17. Upgrade

    Upgrade almalinux/fence-agents-ibmblade to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  18. Upgrade

    Upgrade almalinux/fence-agents-ifmib to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  19. Upgrade

    Upgrade almalinux/fence-agents-ilo-moonshot to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  20. Upgrade

    Upgrade almalinux/fence-agents-ilo-mp to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  21. Upgrade

    Upgrade almalinux/fence-agents-kdump to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  22. Upgrade

    Upgrade almalinux/fence-agents-kubevirt to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  23. Upgrade

    Upgrade almalinux/fence-agents-lpar to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  24. Upgrade

    Upgrade almalinux/fence-agents-mpath to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  25. Upgrade

    Upgrade almalinux/fence-agents-nutanix-ahv to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  26. Upgrade

    Upgrade almalinux/fence-agents-openstack to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  27. Upgrade

    Upgrade almalinux/fence-agents-redfish to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  28. Upgrade

    Upgrade almalinux/fence-agents-rhevm to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  29. Upgrade

    Upgrade almalinux/fence-agents-rsa to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  30. Upgrade

    Upgrade almalinux/fence-agents-scsi to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  31. Upgrade

    Upgrade almalinux/fence-agents-virsh to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  32. Upgrade

    Upgrade almalinux/fence-agents-vmware-rest to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  33. Upgrade

    Upgrade almalinux/fence-virt to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  34. Upgrade

    Upgrade almalinux/fence-virtd-libvirt to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  35. Upgrade

    Upgrade almalinux/fence-virtd-multicast to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  36. Upgrade

    Upgrade almalinux/fence-virtd-serial to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8
  37. Upgrade

    Upgrade almalinux/ha-cloud-support to a version that resolves this vulnerability.

    Fixed in 4.10.0-110.el9_8.8

Event History

Nov 3, 2026
Advisory Published
via OSV·12:00 AM
Data Sourced
via OSV·12:00 AM
DescriptionAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

1

Which authentication and key-validation patterns are implicated by these fixes?

The listed issues involve acceptance of an empty HMAC key, improper public-key validation, use of DER public keys as HMAC secrets, unvalidated JWKS redirects, and Unicode byte-order mark handling during token processing.

2

What are the stated security impacts of the listed issues?

The advisory identifies authentication bypasses, token forgery, and verification-key substitution. It does not provide affected versions, configuration prerequisites, exploit detection guidance, or mitigations for systems that cannot yet be updated.

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