What is CVE-2026-58592?

CVE-2026-58592 is a high-severity vulnerability in Ladybirdbrowser Ladybird, classified under Out-of-bounds Write. CVSS score: 8.3/10. Published 2026-07-01.

How severe is CVE-2026-58592?

High severity. CVSS v3 base score is 8.3 out of 10.

Buffer overflow in Ladybirdbrowser Ladybird

CVE-2026-58592

Ladybird contains a dangling-reference memory-safety flaw in its WebAssembly ESM-integration module loader. When a JavaScript function is imported into a WebAssembly module via the ESM path, WebAssemblyModule.cpp passes a stack-local Wasm…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Ladybirdbrowser Ladybird — versions 0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write
CWE-825
CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-58592?: CVE-2026-58592 is a high-severity vulnerability in Ladybirdbrowser Ladybird, classified under Out-of-bounds Write. CVSS score: 8.3/10. Published 2026-07-01.
How severe is CVE-2026-58592?: High severity. CVSS v3 base score is 8.3 out of 10.