CVE-2020-12079: Beaker before 0.8.9 allows a sandbox escape, enabling system access and code execution

Q: How do I fix CVE-2020-12079?

beaker: upgrade to 0.8.9. Exact commands for each OS are on this page.

Q: Is CVE-2020-12079 being exploited?

CVE-2020-12079 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-12079 affect?

CVE-2020-12079 affects beaker. Severity is critical (CVSS 10.0). Beaker before 0.8.9 allows a sandbox escape, enabling system access and code execution. This occurs because Electron context isolation is not used, and therefore an attacker can conduct a prototype-pollution attack against the Electron inte

Q: How urgent is CVE-2020-12079?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 10.0REMOTEUPGRADE

CVE-2020-12079 is a critical-severity flaw (CVSS 10.0) affecting beaker. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Beaker before 0.8.9 allows a sandbox escape, enabling system access and code execution. This occurs because Electron context isolation is not used, and therefore an attacker can conduct a prototype-pollution attack against the Electron internal messaging API.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-1321
Published	2020-04-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: beakerbrowser

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-04-23 04:15 UTCPublished CVE record published
2026-06-17 02:51 UTCUpdated Record last modified

beakerbrowser beaker UPGRADE

Affected: < 0.8.9

Fixed in: 0.8.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy beaker || rpm -q beaker || beaker --version

2. UPGRADE to 0.8.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade beaker

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade beaker

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-12079?

beaker: upgrade to 0.8.9. Exact commands for each OS are on this page.

Is CVE-2020-12079 being exploited?

CVE-2020-12079 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-12079 affect?

CVE-2020-12079 affects beaker. Severity is critical (CVSS 10.0). Beaker before 0.8.9 allows a sandbox escape, enabling system access and code execution. This occurs because Electron context isolation is not used, and therefore an attacker can conduct a prototype-pollution attack against the Electron inte

How urgent is CVE-2020-12079?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Electron vulnerabilities

Related CVEs

CVE-2013-7489 MEDIUM 6.8 UPGRADE The Beaker library through 1.11.0 for Python is affected by deserialization of untrusted data, which could lea

References

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