CVE-2025-58749Public exploit

Service interruption via sign-extended memory.fill offset

Published Sep 16, 2025 · Updated Sep 16, 2025

Denial of service in Bytecode Alliance WAMR before 2.4.2 allows local users to hang or crash iwasm through crafted Wasm input. LLVM-JIT's check_bulk_memory_overflow passes a sign-extended offset of at least 2 GiB to LLVMBuildInBoundsGEP2, producing an invalid pointer. The affected build must enable LLVM-JIT and execute the crafted memory.fill instruction; release builds hang, while debug builds crash.

CVSS severity2.1
Low
EPSS probability0.37%
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 Bytecode Alliance WAMR before 2.4.2 allows local users to hang or crash iwasm through crafted Wasm input. LLVM-JIT's check_bulk_memory_overflow passes a sign-extended offset of at least 2 GiB to LLVMBuildInBoundsGEP2, producing an invalid pointer. The affected build must enable LLVM-JIT and execute the crafted memory.fill instruction; release builds hang, while debug builds crash.

The record

CVE
CVE-2025-58749
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
Bytecode Alliance
Product
WebAssembly Micro Runtime (WAMR)
Classifications
CWE-190, CWE-822, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=< 2.4.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Bytecode Alliance · WebAssembly Micro Runtime (WAMR)version=< 2.4.2

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
2.1GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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-190Integer Overflow or Wraparound
CWE-822Untrusted Pointer Dereference
T1499.004Application or System Exploitation

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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