CVEvulnerability

CVE-2021-21401

7.1 HIGH Published 2021-03-23 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-03-23
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
CVSS 3.1 ([email protected])
7.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
CVSS 2.0 ([email protected])
5.5 MEDIUM — AV:N/AC:L/Au:S/C:N/I:P/A:P
Weaknesses
CWE-763

Description

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 configurations

• nanopb project nanopb (< 0.3.9.8) • nanopb project nanopb (>= 0.4.0 < 0.4.5)

Related

Weakness · CWE (1)

  • CWE-763 Release of Invalid Pointer or Reference weakness

References