# CVE-2019-6284: libsass0: In LibSass 3.5.5, a heap-based buffer over-read exists in Sass::Prelexer::alternatives in prelexer.hpp.

CVE-2019-6284 is fixed in libsass0 on 1 platform by libsass0 3.4.8-1ubuntu0.1~esm1 (version 3.4.8-1ubuntu0.1~esm1), released January 14, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2019-6284
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0201
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 14, 2019

## Description

In LibSass 3.5.5, a heap-based buffer over-read exists in Sass::Prelexer::alternatives in prelexer.hpp.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libsass0 Ubuntu 18.04.6 LTS (bionic) | 3.4.8-1ubuntu0.1~esm1 | [libsass0 3.4.8-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libsass0-3.4.8-1ubuntu0.1-esm1.md) | Jan 14, 2019 |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo