CVE-2024-27934Public exploit

Host code execution via external-pointer use-after-free

Published Mar 6, 2024 · Updated Aug 2, 2024

Use-after-free in Deno 1.36.2 through 1.40.2 allows local users to execute arbitrary code on the host through runtime-controlled code. The runtime wraps arbitrary void pointers in v8::External values while eliding Rust lifetimes; its ExternalPointer marker relies on predictable or leaked PIE base addresses, leaving freed structures accessible. Control of code running inside Deno is required, but successful exploitation escapes Deno permissions and grants host-level code execution.

CVSS severity8.4
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Deno 1.36.2 through 1.40.2 allows local users to execute arbitrary code on the host through runtime-controlled code. The runtime wraps arbitrary void pointers in v8::External values while eliding Rust lifetimes; its ExternalPointer marker relies on predictable or leaked PIE base addresses, leaving freed structures accessible. Control of code running inside Deno is required, but successful exploitation escapes Deno permissions and grants host-level code execution.

The record

CVE
CVE-2024-27934
Published
Mar 6, 2024
Updated
Aug 2, 2024
Vendor
Deno Land Inc.
Product
Deno
Classifications
CWE-416, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.36.2, < 1.40.3
  2. Affected versionversion=1.36.2 <1.40.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Deno Land Inc. · Denoversion=>= 1.36.2, < 1.40.3; version=1.36.2 <1.40.3

Published CVSS scores

8.4GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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