Listen to this Post
CVE-2025-69261 is a medium-severity vulnerability in the WasmEdge WebAssembly runtime, stemming from an integer wrap vulnerability in a memory bounds check function. Prior to version 0.16.0-alpha.3, a multiplication operation within the `checkAccessBound()` function, located in WasmEdge/include/runtime/instance/memory.h, is susceptible to integer overflow. When performing a memory access, the runtime calculates an offset by multiplying values. If an attacker can influence these values to be sufficiently large, the product can exceed the maximum value of the integer type used, causing it to “wrap around” to a small number. This wrapped value leads `checkAccessBound()` to incorrectly conclude that a memory access is within limits when it is actually out-of-bounds . The result is a segmentation fault as the program attempts to read or write invalid memory, leading to a crash and a Denial of Service (DoS) . The issue is resolved in version 0.16.0-alpha.3 . The CVSS vector string (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P) indicates the attack is network-based, requires no privileges or user interaction, and has a low availability impact .
dailycve form:
Platform: WasmEdge Runtime
Version: <0.16.0-alpha.3
Vulnerability :Integer Overflow Wrap
Severity: Medium (5.5)
date: Dec 30 2025
Prediction: Patch Already Available
What Undercode Say:
Analytics:
The vulnerability was published on 2025-12-30 and last modified on 2025-12-31 by GitHub, Inc. . The CVSS-BT score from the CNA is 5.5 MEDIUM . The Exploit Maturity is marked as Proof-of-Concept (E:P) . The primary weakness is CWE-190 (Integer Overflow or Wraparound) . Red Hat rates this as a Moderate impact, affecting packages in EPEL, Fedora, and OpenShift Container Platform . The EPSS score is approximately 0.00042, indicating a very low probability of exploitation in the wild as of early 2026 . Ubuntu has marked it for needs evaluation in its 24.04 LTS release .
Exploit:
This is a conceptual example of how the integer overflow is triggered.
The vulnerability lies in the C++ source code of WasmEdge, not in a bash script.
It demonstrates the logic error in the bounds check.
Vulnerable code snippet (conceptual from memory.h):
size_t offset = num_elements element_size;
if (checkAccessBound(offset)) { // This check passes if offset wraps to a small value
// Access memory, causing segmentation fault
}
The following command cannot directly exploit the CVE but checks for the presence of the vulnerable package version.
Check installed version of WasmEdge (if available via a package manager)
wasmedge --version
Example output of a vulnerable version:
wasmedge version 0.15.0
Fetch the official security advisory from GitHub
curl -L https://github.com/WasmEdge/WasmEdge/security/advisories/GHSA-89fm-8mr7-gg4m
Clone the repository to inspect the patch
git clone https://github.com/WasmEdge/WasmEdge.git
cd WasmEdge
git show 37cc9fa19bd23edbbdaa9252059b17f191fa4d17
Protection from this CVE:
Update to the patched version (0.16.0-alpha.3 or later) If installed via source, pull the latest changes and recompile. cd /path/to/WasmEdge git pull git checkout 0.16.0-alpha.3 mkdir -p build && cd build cmake -DCMAKE_BUILD_TYPE=Release .. make sudo make install If installed via a package manager like apt or dnf, update the package once available. For example, on Fedora/EPEL: sudo dnf update wasmedge Verify the version is patched wasmedge --version Expected output: wasmedge version 0.16.0-alpha.3 or higher
Impact:
A remote, unauthenticated attacker can cause a vulnerable WasmEdge runtime to crash by providing a malicious WebAssembly module that triggers the integer wrap . This leads to a segmentation fault, resulting in a Denial of Service (DoS) . The confidentiality and integrity of the system are not directly compromised (VC:N/VI:N) . The impact is limited to availability (VA:L) .
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
