CVE-2023-36109

CRITICALNVD 9.89.8—Elevated

9.8

Buffer Overflow vulnerability in JerryScript version 3.0, allows remote attackers to execute arbitrary code via ecma_stringbuilder_append_raw component at /jerry-core/ecma/base/ecma-helpers-string.c.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 95.7%
KEV: Not listed

Published

September 20, 2023

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated May 24, 2026

No patch confirmed yet.

generic

==1327323==ERROR: AddressSanitizer: memcpy-param-overlap: memory ranges [0x55fb3005c209,0x55fc3005c205) and [0x55fc3005c0f8, 0x55fd3005c0f4) overlap · Issue #5080 · jerryscript-project/jerryscript · GitHub

https://github.com/jerryscript-project/jerryscript/issues/5080

generic

GitHub - Limesss/CVE-2023-36109: a poc for cve-2023-36109 · GitHub

https://github.com/Limesss/CVE-2023-36109/tree/main

Weakness Classification(1)

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

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-06 13:46 UTCepss_batch
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2026-06-05 22:46 UTCepss_batch
2026-06-05 22:46 UTCepss_batch
2026-06-04 13:11 UTCepss_batch
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2026-06-02 20:12 UTCepss_batch
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2026-05-31 22:30 UTCepss_batch
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2026-05-31 00:15 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoCLimesss/CVE-2023-36109
First seen Sep 20, 2023
a poc for cve-2023-36109
Open source ↗

Frequently asked(5)

What is CVE-2023-36109?

CVE-2023-36109 is a critical vulnerability published on September 20, 2023. Buffer Overflow vulnerability in JerryScript version 3.0, allows remote attackers to execute arbitrary code via ecmastringbuilderappend_raw component at /jerry-core/ecma/base/ecma-helpers-string.c.

When was CVE-2023-36109 disclosed?

CVE-2023-36109 was first published in the National Vulnerability Database on September 20, 2023, 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-2023-36109 actively exploited?

CVE-2023-36109 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-36109?

CVE-2023-36109 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2023-36109?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-36109, 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-2023-36109

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CVE-2023-36109

📅 Published

🔄 Last Modified

📋 Advisory Details (2)