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CVE-2026-10849 is a heap-based out-of-bounds write in the Zephyr hawkBit device management client, affecting response handling in response_json_cb() within subsys/mgmt/hawkbit/hawkbit.c. The client accumulates the HTTP response body from the update server into a heap buffer sized only for the received body bytes, without reserving an additional byte for a terminating NUL character. After the full response is received, the code appends a terminator at response_data[downloaded_size], which writes one byte past the end of the allocation whenever the accumulated body length exactly matches the allocated size. The response length and fragmentation are controlled by the remote hawkBit server, making the flaw remotely reachable. In versions since 4.0.0, buffer growth to exactly downloaded_size plus body_len makes the out-of-bounds write deterministic for response bodies larger than the initial 1100-byte buffer. In versions before 4.0.0, an equality condition in the growth check can skip reallocation when the body length exactly matches the current allocation, also causing the terminating write to land out of bounds. The flaw affects Zephyr versions from 2.4.0 up to, but not including, 4.5.0.
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