CVE-2026-16395: Integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

criticalCVSS 9.8CVE-2026-16395

Integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: critical — CVSS 9.8
Published: 2026-07-21
Last updated: 2026-07-22
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-16395

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-163950.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-16395	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Mozilla Firefox and Firefox ESR: Multiple vulnerabilitiescert-bund
unknownMozilla Products Multiple Vulnerabilitieshkcert

Recent advisories for Integer overflow in

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-70638: llama.cpp builds b1886 through b7445 contain an integer overflow vulnerability in the LLaMA-An…nvd · 2026-08-06
highCVE-2026-70628: FFmpeg versions from 0.5 up to, but not including, 9.0 contain a signed integer overflow vulne…nvd · 2026-08-06
highCVE-2026-43627: llama.cpp builds b1283 through b9058 contain an integer overflow vulnerability in the llama_ba…nvd · 2026-08-06
highCVE-2026-19174: Integer overflow in V8 in Google Chrome prior to 151.0.7922.109 allowed a remote attacker to e…nvd · 2026-08-06
unknownCVE-2026-19167: Integer overflow in GPU in Google Chrome prior to 151.0.7922.109 allowed a remote attacker who…nvd · 2026-08-06
highCVE-2026-71261: dr_libs dr_wav.h (all versions through current master) contains an integer overflow in W64 CUE…nvd · 2026-08-05