CVE-2026-17426: IBM Power Systems OpenBMC denial of service via unhandled exception

CVE-2026-17426 · Severity: medium · CVSS 6.5 · Published 2026-11-08

IBM Power Systems firmware contains an unhandled exception in the OpenBMC HTTPS service that allows unauthenticated remote attackers to crash the BMC (Baseboard Management Controller) service. The BMC is the out-of-band management interface that administrators use to monitor and control physical servers, and a denial of service would make these critical infrastructure systems unmanageable until the BMC restarts.

Technologies: IBM Power System E1050, IBM Power System L1022, IBM Power System L1024, IBM Power System S1012, IBM Power System S1014, IBM Power System S1022, IBM Power System S1022s, IBM Power System S1024. Vendors: IBM.

Quick answers

Is CVE-2026-17426 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-17426 being exploited in the wild.
How severe is CVE-2026-17426?
Medium severity, with a CVSS score of 6.5, published 8 November 2026.
Which products and versions are affected?
IBM Power System E1050 FW1060.00 through FW1060.81; IBM Power System L1022 FW1060.00 through FW1060.81; IBM Power System L1024 FW1060.00 through FW1060.81; IBM Power System S1012 FW1060.00 through FW1060.81; and 4 more.
Is there a fix for CVE-2026-17426?
Yes: fixed in FW1060.82(1060_195) or newer. Until then: Protect access to the BMC's network interface by operating it on a private network or behind a firewall to restrict exposure to unauthenticated remote attackers. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-17426 attacked?
It is attacked from the adjacent network, in device firmware.
Am I affected by CVE-2026-17426?
Check whether you run IBM Power System E1050, IBM Power System L1022, IBM Power System L1024 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: FW1060.82(1060_195) or newer

Protect access to the BMC's network interface by operating it on a private network or behind a firewall to restrict exposure to unauthenticated remote attackers.

Technical details

An uncaught exception (CWE-248) in the OpenBMC HTTPS service allows unauthenticated remote attackers to trigger a crash, causing denial of service to the BMC management interface. The attack is network-adjacent (CVSS:3.1/AV:A) with no authentication required, meaning attackers on the BMC's network segment can send crafted requests to crash the service. The vulnerability is fixed in firmware FW1060.82(1060_195) and later.

Affected products

  • IBM Power System S1022 FW1060.00 through FW1060.81
  • IBM Power System S1024 FW1060.00 through FW1060.81
  • IBM Power System S1022s FW1060.00 through FW1060.81
  • IBM Power System S1014 FW1060.00 through FW1060.81
  • IBM Power System L1022 FW1060.00 through FW1060.81
  • IBM Power System L1024 FW1060.00 through FW1060.81
  • IBM Power System E1050 FW1060.00 through FW1060.81
  • IBM Power System S1012 FW1060.00 through FW1060.81

Timeline

  • 2026-10-08: disclosed

References

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