CVE-2023-30300

An issue in the component hang.wasm of WebAssembly 1.0 causes an infinite loop.

5.5 MediumFix available

An issue in the component hang.wasm of WebAssembly 1.0 causes an infinite loop.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.28%Up 0.2 points since May 4, 2023

What each source reports

NVD Score used 5.5

An issue in the component hang.wasm of WebAssembly 1.0 causes an infinite loop.

Record: CVE-2023-30300
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-835
Updated: 2026-11-02

CVE List 5.5

An issue in the component hang.wasm of WebAssembly 1.0 causes an infinite loop.

Record: CVE-2023-30300
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-835
Updated: 2026-11-02

EUVDEUVD-2023-34723 5.5

An issue in the component hang.wasm of WebAssembly 1.0 causes an infinite loop.

Record: EUVD-2023-34723
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-pm5m-2p5c-6mv8 5.5

An issue in the component hang.wasm of WebAssembly 1.0 causes an infinite loop.

An issue in the component hang.wasm of WebAssembly 1.0 causes an infinite loop.

Record: GHSA-pm5m-2p5c-6mv8
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-835
Updated: 2026-11-02

OSV 5.5

An issue in the component hang.wasm of WebAssembly 1.0 causes an infinite loop.

Record: CVE-2023-30300
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2023-30300 5.5

An issue in the component hang.wasm of WebAssembly 1.0 causes an infinite loop.

Record: DEBIAN-CVE-2023-30300
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2023-30300 5.5

An issue in the component hang.wasm of WebAssembly 1.0 causes an infinite loop.

Record: UBUNTU-CVE-2023-30300
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

w3 webassembly

Affected packages

Affected packages
Package	Affected	Fixed
`wabt` Debian:12	All versions, plus listed versions 1.0.32-11.0.33-11.0.34+dsfg+~cs1.0.32-11.0.34+dsfg2+~cs1.0.32-11.0.34+dsfg2+~cs1.0.32-2 Show 9 moreShow less 1.0.34+dsfg2+~cs1.0.32-31.0.34+dsfg2+~cs1.0.32-41.0.34-11.0.36+dfsg+~cs1.0.36-11.0.36+dfsg+~cs1.0.36-21.0.41+dfsg+~cs1.0.39-11.0.41+dfsg+~cs1.0.39-21.0.42+dfsg+~cs1.0.39-11.0.42+dfsg+~cs1.0.39-2	None known
`wabt` Debian:13	before 1.0.33-1	1.0.33-1
`wabt` Debian:14	before 1.0.33-1	1.0.33-1
`wabt` Ubuntu:20.04:LTS	All versions, plus listed versions 1.0.11-11.0.12-11.0.13-11.0.13-1build1	None known
`wabt` Ubuntu:22.04:LTS	All versions, plus listed versions 1.0.20-11.0.24-11.0.24-21.0.25-11.0.26-11.0.27-1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-30300 is a medium vulnerability (CVSS 5.5) in W3 Webassembly, published May 3, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 21st percentile. Fixed in wabt 1.0.33-1.

References

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