CVE-2022-1212

CRITICALNVD 9.89.8—

9.8

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 75.9%
KEV: Not listed

Published

April 5, 2022

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jun 8, 2026

Upstream fix merged — awaiting tagged release. Sources: github_commit.

generic

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github_commit

commit 3cf291f72224 (mruby/mruby)

Fix landed in mruby/mruby commit 3cf291f72224 — awaiting tagged release

https://github.com/mruby/mruby/commit/3cf291f72224715942beaf8553e42ba8891ab3c6

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-416Use After Free

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 18:46 UTCOSV refresh
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:11 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2022-1212?

CVE-2022-1212 is a critical vulnerability published on April 5, 2022. Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

When was CVE-2022-1212 disclosed?

CVE-2022-1212 was first published in the National Vulnerability Database on April 5, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2022-1212 actively exploited?

CVE-2022-1212 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2022-1212?

CVE-2022-1212 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2022-1212?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-1212, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2022-1212

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CVE-2022-1212

📅 Published

🔄 Last Modified

📋 Advisory Details (2)