CVE-2025-14957Public exploit

Local denial of service via unchecked local index

Published Dec 19, 2025 · Updated Dec 19, 2025

Null pointer dereference in Binaryen 125 and earlier allows local users to crash wasm-opt with a malformed WebAssembly binary. IRBuilder::makeLocalGet, makeLocalSet, and makeLocalTee accept an out-of-range local index and pass it to Function::getLocalType without validating it against the function's local count. Exploitation requires local ability to invoke wasm-opt on attacker-controlled input and terminates only that tool process.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Binaryen 125 and earlier allows local users to crash wasm-opt with a malformed WebAssembly binary. IRBuilder::makeLocalGet, makeLocalSet, and makeLocalTee accept an out-of-range local index and pass it to Function::getLocalType without validating it against the function's local count. Exploitation requires local ability to invoke wasm-opt on attacker-controlled input and terminates only that tool process.

The record

CVE
CVE-2025-14957
Published
Dec 19, 2025
Updated
Dec 19, 2025
Vendor
WebAssembly
Product
Binaryen
Classifications
CWE-404, CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 19, 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?

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

  1. Affected versionversion=125

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

WebAssembly · Binaryenversion=125

Published CVSS scores

1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
3.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1.7VulDBAV:L/AC:L/Au:S/C:N/I:N/A: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
CWE-476NULL Pointer Dereference
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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