CVE-2024-53984: Nanopb

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Nanopb is a small code-size Protocol Buffers implementation. When the compile time option PB_ENABLE_MALLOC is enabled, the message contains at least one field with FT_POINTER field type, custom stream callback is used with unknown stream length. and the pb_decode_ex() function is used with flag PB_DECODE_DELIMITED, then the pb_decode_ex() function does not automatically call pb_release(), like is done for other failure cases. This could lead to memory leak and potential denial-of-service. This vulnerability is fixed in 0.4.9.1.

Affected products

• Nanopb Nanopb: from 0.4.0, before 0.4.9.1 (fixed in 0.4.9.1)

Published 2024-12-02. Last modified 2026-06-17.