What is CVE-2021-46055?

CVE-2021-46055 is a medium-severity vulnerability in Webassembly Binaryen, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2022-01-10.

How severe is CVE-2021-46055?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Webassembly Binaryen

CVE-2021-46055

A Denial of Service vulnerability exists in Binaryen 104 due to an assertion abort in wasm::WasmBinaryBuilder::visitRethrow(wasm::Rethrow*).

Published 2022-01-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Webassembly Binaryen — versions 104

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

github.com/WebAssembly/binaryen/issues/4413 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-46055?: CVE-2021-46055 is a medium-severity vulnerability in Webassembly Binaryen, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2022-01-10.
How severe is CVE-2021-46055?: Medium severity. CVSS v3 base score is 5.5 out of 10.