How severe is CVE-2025-14956?

CVE-2025-14956 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-14956 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-14956?

CVE-2025-14956 affects Webassembly Binaryen. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-14956?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-14956 have an EU (EUVD) identifier?

Yes. CVE-2025-14956 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204567.

When was CVE-2025-14956 published?

CVE-2025-14956 was published on 2025-12-19 and last updated on 2026-06-17.

CVE-2025-14956

CVE-2025-14956 is a medium-severity vulnerability in Webassembly Binaryen with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 4.3
CVSS v4: 1.9
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-204567
Weakness: CWE-125
Affected product: Webassembly Binaryen
Published: 2025-12-19
Last modified: 2026-06-17

Description

A vulnerability was determined in WebAssembly Binaryen up to 125. Affected by this issue is the function WasmBinaryReader::readExport of the file src/wasm/wasm-binary.cpp. This manipulation causes heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. Patch name: 4f52bff8c4075b5630422f902dd92a0af2c9f398. It is recommended to apply a patch to fix this issue.

Frequently asked questions

What is CVE-2025-14956?: A vulnerability was determined in WebAssembly Binaryen up to 125. Affected by this issue is the function WasmBinaryReader::readExport of the file src/wasm/wasm-binary.cpp. This manipulation causes heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. Patch name: 4f52bff8c4075b5630422f902dd92a0af2c9f398. It is recommended to apply a patch to fix this issue.
How severe is CVE-2025-14956?: CVE-2025-14956 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-14956 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-14956?: CVE-2025-14956 affects Webassembly Binaryen. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-14956?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-14956 have an EU (EUVD) identifier?: Yes. CVE-2025-14956 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204567.
When was CVE-2025-14956 published?: CVE-2025-14956 was published on 2025-12-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:webassembly:binaryen:*:*:*:*:*:*:*:*

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