CVE-2024-27529Public exploit

Service interruption via unreleased memory-import strings

Published Nov 8, 2024 · Updated Nov 18, 2024

Memory leak in Read_utf8 in Wasm3 139076a allows attackers to consume memory by supplying a malformed WebAssembly module. Read_utf8 allocates UTF-8 strings for a module's memory import, but m3_FreeModule omits FreeImportInfo for memoryImport during teardown. The supplied module must reach the runtime; the demonstrated malformed input triggers a parsing underrun and leaks 11 bytes across two allocations.

CVSS severity8.4
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory leak in Read_utf8 in Wasm3 139076a allows attackers to consume memory by supplying a malformed WebAssembly module. Read_utf8 allocates UTF-8 strings for a module's memory import, but m3_FreeModule omits FreeImportInfo for memoryImport during teardown. The supplied module must reach the runtime; the demonstrated malformed input triggers a parsing underrun and leaks 11 bytes across two allocations.

The record

CVE
CVE-2024-27529
Published
Nov 8, 2024
Updated
Nov 18, 2024
Vendor
Wasm3 Labs
Product
Wasm3
Classifications
CWE-125, CWE-400, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 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=139076a98b8321b67f850a844f558b5e91b5ac83

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Wasm3 Labs · Wasm3version=139076a98b8321b67f850a844f558b5e91b5ac83

Published CVSS scores

8.4CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.9GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

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-125Out-of-bounds Read
CWE-400Uncontrolled Resource Consumption
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo