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CVE-2020-26243— Memory leak in nanopb

Quick assessment

Affected
nanopb nanopb
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nanopb是Nanopb个人开发者的一个适用于微处理器的协议缓冲区实现。 Nanopb 0.4.4版本和0.3.9.7之前版本存在缓冲区错误漏洞，该漏洞源于如果启用了动态分配，且其中一个字段包含包含动态字段的静态子消息，且被解码的消息多次包含该子消息，则特定格式的解码消息可能会泄漏内存。

CVSS 7.5 · High EPSS 2.66% · P86

Possible ATT&CK Techniques 1 AI

T1562.001
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I. Basic Information for CVE-2020-26243

Vulnerability Information
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Vulnerability Title
Memory leak in nanopb
Source: CVE Program / CVE List V5
Vulnerability Description
Nanopb is a small code-size Protocol Buffers implementation. In Nanopb before versions 0.4.4 and 0.3.9.7, decoding specifically formed message can leak memory if dynamic allocation is enabled and an oneof field contains a static submessage that contains a dynamic field, and the message being decoded contains the submessage multiple times. This is rare in normal messages, but it is a concern when untrusted data is parsed. This is fixed in versions 0.3.9.7 and 0.4.4. The following workarounds are available: 1) Set the option `no_unions` for the oneof field. This will generate fields as separate instead of C union, and avoids triggering the problematic code. 2) Set the type of the submessage field inside oneof to `FT_POINTER`. This way the whole submessage will be dynamically allocated and the problematic code is not executed. 3) Use an arena allocator for nanopb, to make sure all memory can be released afterwards.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nanopb 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nanopb是Nanopb个人开发者的一个适用于微处理器的协议缓冲区实现。 Nanopb 0.4.4版本和0.3.9.7之前版本存在缓冲区错误漏洞，该漏洞源于如果启用了动态分配，且其中一个字段包含包含动态字段的静态子消息，且被解码的消息多次包含该子消息，则特定格式的解码消息可能会泄漏内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nanopb nanopb < 0.3.9.7 -

II. Public POCs for CVE-2020-26243

# POC Description Source Link Shenlong Link
1 None https://github.com/HimanshuS67/external_nanopb-c_AOSP10_CVE-2020-26243 POC Details
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III. Intelligence Information for CVE-2020-26243

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Patches & Fixes for CVE-2020-26243 (1)

Vendor Advisories for CVE-2020-26243 (1)

Other References for CVE-2020-26243 (2)

IV. Related Vulnerabilities

Same product: nanopb
Same vendor: nanopb
Same weakness: CWE-20