The vulnerability of the Playback component in the Firefox web browser and Thunderbird email client allows a hacker to compromise data integrity.

🗓️ 10 Aug 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType

The vulnerability of the Playback component in the Firefox web browser and the Thunderbird email client is related to a numerical overflow condition. Exploiting this vulnerability can allow an attacker to compromise data integrity remotely.

Reporter	Title	Published	Views	Family All 31
FreeBSD	Mozilla -- Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component	21 Apr 202600:00	–	freebsd
ATTACKERKB	CVE-2026-6783	21 Apr 202612:41	–	attackerkb
AlpineLinux	CVE-2026-6783	21 Apr 202612:41	–	alpinelinux
AstraLinux	Astra Linux – Vulnerability in Firefox	5 Aug 202612:44	–	astralinux
Chainguard	CVE-2026-6783 vulnerabilities	1 Jul 202614:17	–	cgr
Circl	CVE-2026-6783	21 Apr 202620:00	–	circl
CNNVD	Mozilla Firefox和Mozilla Thunderbird 安全漏洞	21 Apr 202600:00	–	cnnvd
CVE	CVE-2026-6783	21 Apr 202612:41	–	cve
Cvelist	CVE-2026-6783 Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component	21 Apr 202612:41	–	cvelist
Debian CVE	CVE-2026-6783	21 Apr 202612:41	–	debiancve

Vulners

Node

mozilla firefoxRange<150.0

mozilla thunderbirdRange<150.0

Source	Link
nvd	www.nvd.nist.gov/vuln/detail/CVE-2026-6783
security-tracker	www.security-tracker.debian.org/tracker/CVE-2026-6783
mozilla	www.mozilla.org/en-US/security/advisories/mfsa2026-30/
mozilla	www.mozilla.org/en-US/security/advisories/mfsa2026-33/
mozilla	www.mozilla.org/security/advisories/mfsa2026-30/
mozilla	www.mozilla.org/security/advisories/mfsa2026-33/
wiki	www.wiki.astralinux.ru/astra-linux-se18-bulletin-2026-0805SE18HF
ubuntu	www.ubuntu.com/security/CVE-2026-6783
web	www.web.nvd.nist.gov/view/vuln/detail
mozilla	www.mozilla.org/security/advisories/mfsa2026-30.html

10 Aug 2026 00:00Current

5.7Medium risk

Vulners AI Score5.7

CVSS 25

CVSS 35.3

EPSS0.0023