CVE-2024-34249Public exploitNetwork attack vector

Process crash via out-of-bounds slot read

Published May 6, 2024 · Updated Aug 2, 2024

Heap buffer overflow in Wasm3 0.5.0 allows remote attackers to crash an embedding process with a crafted WebAssembly module. During compilation, DeallocateSlot in source/m3_compile.c reads one byte outside heap storage while unwinding deeply nested block instructions. The host application must load the malicious module, and the demonstrated consequence is process termination.

CVSS severity9.8
Critical
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in Wasm3 0.5.0 allows remote attackers to crash an embedding process with a crafted WebAssembly module. During compilation, DeallocateSlot in source/m3_compile.c reads one byte outside heap storage while unwinding deeply nested block instructions. The host application must load the malicious module, and the demonstrated consequence is process termination.

The record

CVE
CVE-2024-34249
Published
May 6, 2024
Updated
Aug 2, 2024
Vendor
Wasm3 Labs
Product
Wasm3
Classifications
CWE-122, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 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

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Is a vulnerable build present?

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

  1. Affected versionversion=0.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wasm3 Labs · Wasm3version=0.5.0

Published CVSS scores

9.8CISA ADP VulnrichmentCVSS:3.1/AV:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1499Endpoint Denial of Service

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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