SB2026111242 - Release of invalid pointer or reference in Nanopb

Description

This security bulletin contains information about 1 vulnerability.

1) Release of invalid pointer or reference (CVE-ID: N/A)

CWE-ID: CWE-763 - Release of invalid pointer or reference

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause program crashes or heap corruption and potentially disclose stale memory contents.

The vulnerability exists due to incomplete initialization in Nanopb's repeated-submessage decoder when processing nonzeroed destination structures. A remote attacker can supply truncated input such as 0a 05 or omit fixed_count arrays to trigger invalid frees of FT_POINTER fields with PB_ENABLE_MALLOC enabled, or expose stale array values through re-encoding even without it.

Remediation

Install update from vendor's website.

References

• https://github.com/nanopb/nanopb/security/advisories/GHSA-5v96-h584-4px4
• https://github.com/nanopb/nanopb/commit/7d7fae09b6ab6637384e3c8e2c808da6dc2f9c47