CVE-2023-27119Public exploit

Local decompiler crash via crafted WebAssembly module

Published Mar 10, 2023 · Updated Feb 28, 2025

Denial of service in WebAssembly Binary Toolkit 1.0.29 allows local users to crash wasm-decompile with a crafted WebAssembly module. The WrapChild routine calls std::string::append while wrapping a malformed child expression, producing an invalid memory read and segmentation fault. Processing the supplied module is required, and the consequence is termination of the current CLI process; Debian reports no security impact.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in WebAssembly Binary Toolkit 1.0.29 allows local users to crash wasm-decompile with a crafted WebAssembly module. The WrapChild routine calls std::string::append while wrapping a malformed child expression, producing an invalid memory read and segmentation fault. Processing the supplied module is required, and the consequence is termination of the current CLI process; Debian reports no security impact.

The record

CVE
CVE-2023-27119
Published
Mar 10, 2023
Updated
Feb 28, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5CISA ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1204.002User Execution: Malicious File

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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