CVE-2025-66453 — Rhino vulnerable high CPU usage and potential DoS when passing specific numbers to toFixed() function

2026-09-29T13:06:28.035677+00:00

Affected: mozilla rhino

Rhino is an open-source implementation of JavaScript written entirely in Java. Prior to 1.8.1, 1.7.15.1, and 1.7.14.1, when an application passed an attacker controlled float poing number into the toFixed() function, it might lead to high CPU consumption and a potential Denial of Service. Small numbers go through this call stack: NativeNumber.numTo > DToA.JS_dtostr > DToA.JS_dtoa > DToA.pow5mult where pow5mult attempts to raise 5 to a ridiculous power. This vulnerability is fixed in 1.8.1, 1.7.15.1, and 1.7.14.1.

GHSA-3w8q-xq97-5j7x — Rhino has high CPU usage and potential DoS when passing specific numbers to `toFixed()` function

2026-09-29T13:06:28.035806+00:00

Affected: Maven: org.mozilla:rhino

When an application passed an attacker controlled float poing number into the `toFixed()` function, it might lead to high CPU consumption and a potential Denial of Service.

Small numbers go through this call stack: `NativeNumber.numTo > DToA.JS_dtostr > DToA.JS_dtoa > DToA.pow5mult` where `pow5mult` attempts to raise `5` to a ridiculous power.

Example code: `(4.47118444E-314).toFixed(2)`

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CVE-2025-66453 — Rhino vulnerable high CPU usage and potential DoS when passing specific numbers to toFixed() function

GHSA-3w8q-xq97-5j7x — Rhino has high CPU usage and potential DoS when passing specific numbers to `toFixed()` function