CVE Catalog

CVE-2026-100771

HighCVSS 8.1
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.33%

24th percentile - higher than 24% of all known CVEs

Summary

Undefined behavior exists in the Streams component of the DOM. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Risk Assessment

Undefined behavior can cause browser or mail client crashes and, in extreme cases, execution of unintended code. Organizations running unpatched versions face service disruption and potential exploitation.

Recommendation

Update Firefox and Thunderbird to the fixed versions (Firefox 157, Firefox ESR 153.4/140.17/115.42, Thunderbird 157/153.4/140.17). Verify versions across the organization and enforce the update.

Related vulnerabilities

Original NVD description (English source)

Undefined behavior in the DOM: Streams component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS