# ALSA-2021:4231: Security update for 2 packages

ALSA-2021:4231, released November 9, 2021, fixes 8 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/alsa-2021-4231
- Platform: Linux
- Released: Nov 9, 2021
- Priority: High (Closes CVE-2020-36331, high severity)
- CVEs: 8, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/ALSA-2021:4231

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libwebp](https://patchblox.com/security/data/product/linux/libwebp.md) | almalinux 8 | 1.0.0-5.el8 |
| [libwebp-devel](https://patchblox.com/security/data/product/linux/libwebp-devel.md) | almalinux 8 | 1.0.0-5.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-36331](https://patchblox.com/security/data/cve/CVE-2020-36331.md) | High | libwebp: The libwebp packages provide a library and tools for the WebP graphics format | 9.8 | 0.0230 |  |
| [CVE-2018-25010](https://patchblox.com/security/data/cve/CVE-2018-25010.md) | High | libwebp: The libwebp packages provide a library and tools for the WebP graphics format | 9.8 | 0.0224 |  |
| [CVE-2018-25014](https://patchblox.com/security/data/cve/CVE-2018-25014.md) | High | libwebp6: A use of uninitialized value was found in libwebp in versions before 1.0.1 in ReadSymbol(). | 9.8 | 0.0223 |  |
| [CVE-2020-36330](https://patchblox.com/security/data/cve/CVE-2020-36330.md) | High | libwebp: The libwebp packages provide a library and tools for the WebP graphics format | 9.8 | 0.0223 |  |
| [CVE-2018-25009](https://patchblox.com/security/data/cve/CVE-2018-25009.md) | High | libwebp: The libwebp packages provide a library and tools for the WebP graphics format | 9.8 | 0.0210 |  |
| [CVE-2018-25012](https://patchblox.com/security/data/cve/CVE-2018-25012.md) | High | libwebp: The libwebp packages provide a library and tools for the WebP graphics format | 9.8 | 0.0205 |  |
| [CVE-2018-25013](https://patchblox.com/security/data/cve/CVE-2018-25013.md) | High | webp: A heap-based buffer overflow was found in libwebp in versions before 1.0.1 in ShiftBytes(). | 9.8 | 0.0205 |  |
| [CVE-2020-36332](https://patchblox.com/security/data/cve/CVE-2020-36332.md) | High | libsharpyuv0: A flaw was found in libwebp in versions before 1.0.1 | 9.8 | 0.0197 |  |

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Data as of 2026-11-07T06:34:28Z 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