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wabt CVE-2025-6273

| EUVDEUVD-2025-18694 LOW
Reachable Assertion (CWE-617)
2025-06-19 cna@vuldb.com
Denial Of Service Wabt Webassembly
1.9
CVSS 4.0 · NVD

Severity by source

NVD PRIMARY
1.9 LOW
CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
4.0 MEDIUM

Local attack vector, low complexity, no privileges, no user interaction, only availability impact.

3.1 AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Ubuntu
MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

7
CVSS changed
Apr 29, 2026 - 01:11 NVD
3.3 (LOW) 1.9 (LOW)
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 15, 2026 - 00:08 euvd
EUVD-2025-18694
Analysis Generated
Mar 15, 2026 - 00:08 vuln.today
PoC Detected
Jan 06, 2026 - 16:24 vuln.today
Public exploit code
CVE Published
Jun 19, 2025 - 19:15 nvd
LOW 3.3
CVE Published
Jun 19, 2025 - 19:15 cve.org
LOW 1.9

DescriptionCVE.org

A vulnerability was found in WebAssembly wabt up to 1.0.37 and classified as problematic. This issue affects the function LogOpcode of the file src/binary-reader-objdump.cc. The manipulation leads to reachable assertion. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. The real existence of this vulnerability is still doubted at the moment. The code maintainer explains that this issue might not affect "real world wasm programs".

AnalysisAI

Reachable assertion in WebAssembly wabt up to 1.0.37 via the LogOpcode function in src/binary-reader-objdump.cc allows local attackers to cause a denial of service. A public exploit exists, but the vendor doubts real-world impact and a patch is available. EPSS score is low (0.04%), indicating minimal exploitation risk.

Technical ContextAI

The vulnerability is a reachable assertion (CWE-617) in the wabt tool, specifically in the binary reader's objdump functionality. wabt is a WebAssembly Binary Toolkit used for debugging and analyzing .wasm files. The affected function LogOpcode processes opcodes during disassembly. The CPE cpe:2.3:a:webassembly:wabt:*:*:*:*:*:*:*:* indicates all versions up to 1.0.37 are affected. Assertion failures occur when an unexpected condition is met, leading to program termination.

RemediationAI

Upgrade to the latest patched version of wabt from the official repository. The vendor has provided a fix; refer to https://github.com/WebAssembly/wabt/issues/2574 for details. As a workaround, avoid using the objdump functionality on untrusted .wasm files, or restrict local access to the tool. Note that disabling the feature may impact debugging workflows.

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Same weakness CWE-617 – Reachable Assertion

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CVE-2023-37023 HIGH POC
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CVE-2023-37021 HIGH POC
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Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
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Vendor StatusVendor

Ubuntu

Priority: Medium
wabt
Release Status Version
upstream needs-triage -
focal needs-triage -
jammy needs-triage -
noble needs-triage -
oracular ignored end of life, was needs-triage
plucky ignored end of life, was needs-triage
questing needs-triage -

Debian

wabt
Release Status Fixed Version Urgency
bullseye vulnerable 1.0.20-1 -
bookworm vulnerable 1.0.32-1 -
forky, sid, trixie vulnerable 1.0.36+dfsg+~cs1.0.36-2 -
(unstable) fixed (unfixed) unimportant

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CVE-2025-6273 vulnerability details – vuln.today
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