CVE-2026-92155 nasa CVE debrief

Who should care

Defenders responsible for F´ deployments should assess exposure and prioritize upgrading to version 4.2.0 or later. Roles include security teams, system administrators, and developers working with F´.

Why it matters

Defenders should care about CVE-2026-92155 because it causes denial-of-service in F´ versions prior to 4.2.0, potentially disrupting spaceflight and other embedded software applications. Security teams, system administrators, and developers must verify exposure, prioritize upgrading to version 4.2.0 or later, and monitor for unusual packet types.

• Denial-of-service in F´ application processes
• Potential disruption to spaceflight and other embedded software applications
• Need for verification of F´ version and exposure
• Priority for upgrading to version 4.2.0 or later

Technical summary

The vulnerability exists in the Svc::FileUplink component of F´ (F Prime) framework versions prior to 4.2.0. When a network file packet contains an unknown file-packet type byte, the assertion aborts or resets the default Ref application process, causing a denial-of-service. The issue is fixed in version 4.2.0. The vulnerability is caused by the deserialization of Fw::FilePacket used by Svc::FileUplink, which casts the byte to the Type enum without validating its range. This allows an attacker to trigger an assertion failure by sending a specially crafted network file packet. Defenders should prioritize verifying exposure in F´ deployments and upgrading to version 4.2.0 or later.

Defensive priority

Defenders should prioritize verifying exposure in F´ deployments and upgrading to version 4.2.0 or later. Inventory checks and monitoring for unusual packet types may help detect potential exploitation attempts.

Recommended defensive actions

• Verify F´ version and upgrade to 4.2.0 or later if necessary
• Monitor for unusual packet types in network file packets
• Perform inventory checks for F´ deployments
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, including its impact on F´ versions prior to 4.2.0 and the fix in version 4.2.0. However, there is limited information on potential exploitation or affected systems.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.