CVE-2025-62711Network attack vector

Host crash via missing trampoline trap-handler state

Published Oct 24, 2025 · Updated Oct 24, 2025

Denial of service in Bytecode Alliance Wasmtime 38.0.0 through 38.0.2 allows remote authenticated users to crash the host process. Component-model intrinsic host-to-Wasm trampolines fail to record the VMStoreContext trap-handler address after the exception-unwinding refactor, so a Wasm trap reads a zero address and causes a segfault or assertion failure. Exploitation requires a specially crafted component plus an embedding that invokes affected intrinsics through specific host-call type signatures; core-Wasm-only embeddings are unaffected.

CVSS severity3.1
Low
EPSS probability0.40%
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 Wasmtime 38.0.0 through 38.0.2 allows remote authenticated users to crash the host process. Component-model intrinsic host-to-Wasm trampolines fail to record the VMStoreContext trap-handler address after the exception-unwinding refactor, so a Wasm trap reads a zero address and causes a segfault or assertion failure. Exploitation requires a specially crafted component plus an embedding that invokes affected intrinsics through specific host-call type signatures; core-Wasm-only embeddings are unaffected.

The record

CVE
CVE-2025-62711
Published
Oct 24, 2025
Updated
Oct 24, 2025
Vendor
Bytecode Alliance
Product
Wasmtime
Classifications
CWE-755, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 24, 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=>= 38.0.0, < 38.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Bytecode Alliance · Wasmtimeversion=>= 38.0.0, < 38.0.3

Published CVSS scores

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

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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