# CVE-2021-3756: libmysofa0: libmysofa is vulnerable to Heap-based Buffer Overflow

CVE-2021-3756 is fixed in 3 products on 1 platform, first by libmysofa-utils 0.6~dfsg0-3+deb10u1ubuntu0.1~esm1, released October 29, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-3756
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0107
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 29, 2021

## Description

libmysofa is vulnerable to Heap-based Buffer Overflow

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libmysofa-utils Ubuntu 18.04.6 LTS (bionic) | 0.6~dfsg0-3+deb10u1ubuntu0.1~esm1 | [libmysofa-utils 0.6~dfsg0-3+deb10u1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libmysofa-utils-0.6-dfsg0-3-deb10u1ubuntu0.1-esm1.md) | Oct 29, 2021 |
| Linux | libmysofa-utils Ubuntu 20.04 LTS (focal) | 1.0~dfsg0-1ubuntu0.1~esm1 | [libmysofa-utils 1.0~dfsg0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libmysofa-utils-1.0-dfsg0-1ubuntu0.1-esm1.md) | Oct 29, 2021 |
| Linux | libmysofa-utils Ubuntu 22.04.1 LTS (jammy) | 1.2.1~dfsg0-1 | [libmysofa-utils 1.2.1~dfsg0-1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libmysofa-utils-1.2.1-dfsg0-1.md) | Oct 29, 2021 |
| Linux | libmysofa-utils Ubuntu 24.10 (oracular) | 1.2.1~dfsg0-1 | [libmysofa-utils 1.2.1~dfsg0-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libmysofa-utils-1.2.1-dfsg0-1.md) | Jan 16, 2026 |
| Linux | libmysofa-utils Ubuntu 25.04 (plucky) | 1.2.1~dfsg0-1 | [libmysofa-utils 1.2.1~dfsg0-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libmysofa-utils-1.2.1-dfsg0-1.md) | Jan 16, 2026 |
| Linux | libmysofa0 Ubuntu 18.04.6 LTS (bionic) | 0.6~dfsg0-3+deb10u1ubuntu0.1~esm1 | [libmysofa0 0.6~dfsg0-3+deb10u1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libmysofa0-0.6-dfsg0-3-deb10u1ubuntu0.1-esm1.md) | Oct 29, 2021 |
| Linux | libmysofa1 Ubuntu 20.04 LTS (focal) | 1.0~dfsg0-1ubuntu0.1~esm1 | [libmysofa1 1.0~dfsg0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libmysofa1-1.0-dfsg0-1ubuntu0.1-esm1.md) | Oct 29, 2021 |
| Linux | libmysofa1 Ubuntu 22.04.1 LTS (jammy) | 1.2.1~dfsg0-1 | [libmysofa1 1.2.1~dfsg0-1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libmysofa1-1.2.1-dfsg0-1.md) | Oct 29, 2021 |
| Linux | libmysofa1 Ubuntu 24.10 (oracular) | 1.2.1~dfsg0-1 | [libmysofa1 1.2.1~dfsg0-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libmysofa1-1.2.1-dfsg0-1.md) | Jan 16, 2026 |
| Linux | libmysofa1 Ubuntu 25.04 (plucky) | 1.2.1~dfsg0-1 | [libmysofa1 1.2.1~dfsg0-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libmysofa1-1.2.1-dfsg0-1.md) | Jan 16, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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