Read the docs
TI-2026-74396 Aliases CVE-2026-92158

Integer overflow in F Prime FpySequencer allows out-of-bounds write

Priority HIGH 67CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.

Summary

F Prime (nasa fprime) before 4.2.0 has a flaw in the FpySequencer STORE directive stack write check. The bounds check adds the stack offset and size as U32 values, so integer wraparound makes an out-of-range destination appear valid (CWE-190). An attacker with high privileges who controls a sequence over the network can make memcpy write outside the sequencer stack, causing memory corruption, denial of service and potentially code execution.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

F´ (F Prime) is a framework that enables development and deployment of spaceflight and other embedded software applications. Prior to 4.2.0, Svc::FpySequencer STORE directive stack write validation the bounds check adds attacker-controlled offset and size before memcpy, allowing integer wraparound to make an out-of-range destination appear valid. When a sequence-controlled STORE directive supplies a stack offset and size whose U32 sum wraps, memcpy can write outside the sequencer stack, causing memory corruption, denial of service, and potentially code execution. This issue is fixed in version 4.2.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00857 58th percentileScored 2026-11-07
Fix Fixed fprime (nasa): 4.2.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nasafprimebefore 4.2.04.2.0Patch availableCNA
  • fprime Vendornasa Affected before 4.2.0 Fixed in 4.2.0 Patch available CNA

Remediation

Update nasa fprime to version 4.2.0, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA fprime (nasa) Fixed in 4.2.0

Timeline

  1. 2026-10-15 Threatist record created from CVE-2026-92158
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-29 CISA SSVC decision points changed
  4. 2026-10-29 Priority changed: LOW → HIGH

References

Other 4

  • TI-2025-21552 CryptoLib Has Heap Overflow in Crypto_TM_ProcessSecurity due to Unchecked Secondary Header Length CVSS 3.1CRITICAL 9.4
  • TI-2025-18986 The Memory Management Module of NASA cFS (Core Flight System) Aquila has insecure… CVSS 3.1CRITICAL 9.8
  • TI-2024-36754 A command injection vulnerability in the Command Dispatcher Service of NASA Fprime v3.4.3… CVSS 3.1CRITICAL 9.8
  • TI-2024-36752 A template injection vulnerability in the Dashboard of NASA Fprime v3.4.3 allows… CVSS 3.1CRITICAL 9.8
  • TI-2026-42833 AIT-DSN < 2.2.2 Missing Authentication via SLE API Routes CVSS 4.0CRITICAL 9.3
  • TI-2025-21662 Heap Buffer Overflow via Incomplete Length Check in `Crypto_TC_ApplySecurity` CVSS 4.0CRITICAL 9.3
See all 86 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences