CVE-2021-21401

Summary

Nanopb is a small code-size Protocol Buffers implementation in ansi C. In Nanopb before versions 0.3.9.8 and 0.4.5, decoding a specifically formed message can cause invalid free() or realloc() calls if the message type contains an oneof field, and the oneof directly contains both a pointer field and a non-pointer field. If the message data first contains the non-pointer field and then the pointer field, the data of the non-pointer field is incorrectly treated as if it was a pointer value. Such message data rarely occurs in normal messages, but it is a concern when untrusted data is parsed. This has been fixed in versions 0.3.9.8 and 0.4.5. See referenced GitHub Security Advisory for more information including workarounds.

Affected Software

VendorProductVersion RangeStatus
nanopbnanopb>= 0.3.2, <= 0.3.9.7affected
nanopbnanopb>= 0.4.0, <= 0.4.4affected

Weaknesses

  • CWE-763: CWE-763: Release of Invalid Pointer or Reference

ADP Enrichment

CVE Program Container

Additional References

References