PX4-Autopilot v1.18.0-rc1

What’s Changed

This is a pre-release for flight testing, full release notes can be found here.

Fixes since beta2:

• Estimator: correct sequential fusion and external-position reset-by-fusion (#28273, #28326, #28379), refresh range-height fusion timeouts (#28283), and avoid failover to an instance with failing innovation test ratios (#28533)
• Multicopter: prevent zero hover-thrust estimates, now enforcing a 10% floor (#28365); reset stale terrain-hold state (#28231); bypass velocity filtering when the requested cutoff cannot be applied (#28534)
• VTOL: preserve multicopter mode through mission RTL (#28399), correct tailsitter fixed-wing heading (#28656), and allow fixed-wing external-mode registration while in multicopter form (#28542)
• Navigation: return to overshot, unreached waypoints (#28409), handle position resets during mission takeoff, and stop reporting mission completion as a storage failure (#28537)
• Control allocation: stopped-motor NaNs no longer contaminate unallocated thrust and torque feedback (#28489)
• Home position and battery: correct barometric-filter time units (#28535), preserve analogue battery-filter state across parameter updates (#28536)
• DroneCAN: fix SocketCAN transmit loss/reordering (#28363), NuttX 10.3 FlexCAN transmission (#28381, #28393), and transmit-queue accounting and diagnostics (#28395, #28397)
• CAN node updates: block firmware updates while armed; arming is blocked by default while updates are pending or a node goes offline mid-update (#28089)
• Input validation: reject invalid ST24 packet lengths (#28450) and oversized MAVLink TUNNEL payload declarations (#28575)
• Runtime: fix USB MAVLink startup and reconnect handling (#28250), ensure DDS read requests are created (#28375), and run performance-counter callbacks outside the global list mutex (#28411)
• Sensors: correct InvenSense gyro scaling, IIM42653 full-scale reporting (#28133, #28177), and IIS2MDC data-ready handling, sensitivity and sampling (#28016)
• ESC telemetry: resynchronise serial responses (#28223) and decode EDT current in 1 A steps (#28143). Older AM32 firmware using half-amp encoding reports current twice as high until updated
• Boards: FMUv6X BMP581 fallback (#28401), FMUv6X-RT UART receive buffers and FRAM erase fixes (#28431, #28312), and corrected NXP MR-Tropic DShot timing
• Firmware size and packaging: reduce parameter-constructor flash usage, restoring Corvon 743v1 headroom without removing features (#28320); include flashable CAN-node and FMU bootloader binaries in release assets (#28446, #28496)

Full Changelog: https://github.com/PX4/PX4-Autopilot/compare/v1.18.0-beta2…v1.18.0-rc1

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Source PX4/PX4-Autopilot · v1.18.0-rc1 · 2026-09-10 · upstream release

Mirrored verbatim for indexing. All rights belong to the upstream project.