# CVE-2019-9805: firefox: A latent vulnerability exists in the Prio library where data may be read from uninitialized memory for some functions...

CVE-2019-9805 is fixed in 4 products on 1 platform, first by firefox 66.0+build3-0ubuntu0.18.04.1, released March 19, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2019-9805
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0136
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 19, 2019

## Description

A latent vulnerability exists in the Prio library where data may be read from uninitialized memory for some functions, leading to potential memory corruption. This vulnerability affects Firefox < 66.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 66.0+build3-0ubuntu0.18.04.1 | [firefox 66.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-66.0-build3-0ubuntu0.18.04.1.md) | Mar 19, 2019 |
| Linux | firefox-globalmenu Ubuntu 18.04.6 LTS (bionic) | 66.0+build3-0ubuntu0.18.04.1 | [firefox-globalmenu 66.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-globalmenu-66.0-build3-0ubuntu0.18.04.1.md) | Mar 19, 2019 |
| Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 66.0+build3-0ubuntu0.18.04.1 | [firefox-mozsymbols 66.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-66.0-build3-0ubuntu0.18.04.1.md) | Mar 19, 2019 |
| Linux | firefox-testsuite Ubuntu 18.04.6 LTS (bionic) | 66.0+build3-0ubuntu0.18.04.1 | [firefox-testsuite 66.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-testsuite-66.0-build3-0ubuntu0.18.04.1.md) | Mar 19, 2019 |

---

Data as of 2026-11-07T18:46:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.