CVE-2026-100756
published 2026-09-29CVE-2026-100756: Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17…
PriorityP341high8.1CVSS 3.1
AVNACLPRNUIRSUCHIHAN
EPSS
0.31%
22.1th percentile
Incorrect boundary conditions in the Audio/Video: Playback 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.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 157 | Firefox 157 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 115.0 < 115.42.0 | 115.42.0 |
| mozilla | firefox | >= 140.0.0 < 140.17.0 | 140.17.0 |
| mozilla | firefox | >= 153.0.0 < 153.4.0 | 153.4.0 |
| mozilla | firefox | >= 154.0.0 < 157.0.0 | 157.0.0 |
| mozilla | firefox_esr | < Firefox ESR 115.42 | Firefox ESR 115.42 |
| mozilla | firefox_esr | < Firefox ESR 140.17 | Firefox ESR 140.17 |
| mozilla | firefox_esr | < Firefox ESR 153.4 | Firefox ESR 153.4 |
| mozilla | thunderbird | < Thunderbird 140.17 | Thunderbird 140.17 |
| mozilla | thunderbird | < Thunderbird 153.4 | Thunderbird 153.4 |
| mozilla | thunderbird | < Thunderbird 157 | Thunderbird 157 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 140.0 < 140.17.0 | 140.17.0 |
| mozilla | thunderbird | >= 153.0 < 153.4.0 | 153.4.0 |
| mozilla | thunderbird | >= 154.0 < 157.0 | 157.0 |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
vendor_redhat8.1HIGH
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component
vendor_redhat·2026-09-29·CVSS 8.1
CVE-2026-100756 [HIGH] CWE-119 firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component
firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component
Incorrect boundary conditions in the Audio/Video: Playback 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.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Incorrect boundary conditions in the Audio/Video: Playback component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Mitigation: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprisin
Mozilla
Mozilla Foundation Security Advisory 2026-102: CVE-2026-100756
vendor_mozilla·CVSS 8.1
CVE-2026-100756 [HIGH] Mozilla Foundation Security Advisory 2026-102: CVE-2026-100756
Mozilla Foundation Security Advisory 2026-102
CVE: CVE-2026-100756
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.17
Mozilla
Mozilla Foundation Security Advisory 2026-103: CVE-2026-100756
vendor_mozilla·CVSS 8.1
CVE-2026-100756 [HIGH] Mozilla Foundation Security Advisory 2026-103: CVE-2026-100756
Mozilla Foundation Security Advisory 2026-103
CVE: CVE-2026-100756
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.4
Mozilla
Mozilla Foundation Security Advisory 2026-97: CVE-2026-100756
vendor_mozilla
CVE-2026-100756 Mozilla Foundation Security Advisory 2026-97: CVE-2026-100756
Mozilla Foundation Security Advisory 2026-97
CVE: CVE-2026-100756
Product: Firefox
Impact: low
Fixed in: Firefox 157
Mozilla
Mozilla Foundation Security Advisory 2026-98: CVE-2026-100756
vendor_mozilla
CVE-2026-100756 Mozilla Foundation Security Advisory 2026-98: CVE-2026-100756
Mozilla Foundation Security Advisory 2026-98
CVE: CVE-2026-100756
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 115.42
Mozilla
Mozilla Foundation Security Advisory 2026-99: CVE-2026-100756
vendor_mozilla
CVE-2026-100756 Mozilla Foundation Security Advisory 2026-99: CVE-2026-100756
Mozilla Foundation Security Advisory 2026-99
CVE: CVE-2026-100756
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.17
Mozilla
Mozilla Foundation Security Advisory 2026-100: CVE-2026-100756
vendor_mozilla
CVE-2026-100756 Mozilla Foundation Security Advisory 2026-100: CVE-2026-100756
Mozilla Foundation Security Advisory 2026-100
CVE: CVE-2026-100756
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.4
Mozilla
Mozilla Foundation Security Advisory 2026-101: CVE-2026-100756
vendor_mozilla·CVSS 8.1
CVE-2026-100756 [HIGH] Mozilla Foundation Security Advisory 2026-101: CVE-2026-100756
Mozilla Foundation Security Advisory 2026-101
CVE: CVE-2026-100756
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 157
GHSA
Incorrect boundary conditions in the Audio/Video: Playback component.
ghsa_unreviewed·2026-09-29
CVE-2026-100756 [HIGH] CWE-119 Incorrect boundary conditions in the Audio/Video: Playback component.
Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
No detection rules found.
No public exploits indexed.
Hackernews
⚡ Weekly Recap: NetScaler and FortiMail 0-Days, AI Coding Leaks, Spectre v2 and Ransomware Arrests
blogs_hackernews·2026-10-05·CVSS 7.5
CVE-2026-88779 [HIGH] ⚡ Weekly Recap: NetScaler and FortiMail 0-Days, AI Coding Leaks, Spectre v2 and Ransomware Arrests
Home
Threat Intelligence
Vulnerabilities
Cyber Attacks
Webinars
Expert Insights
Awards
Webinars
Awards
Free eBooks
About THN
Jobs
Advertise with us
## ⚡ Weekly Recap: NetScaler and FortiMail 0-Days, AI Coding Leaks, Spectre v2 and Ransomware Arrests
A blank field. A public repo. One reply to an email. A box left exposed. None of this sounds dramatic, which is partly the problem. This week’s threats keep finding leverage in small things that were easy to overlook.
There are actively exploited bugs in the mix, cleaner intrusion paths, smarter automation, and a long patch list waiting behind them. Some attacks are getting more capable. Others are still getting in because the basics gave way first.
Here’s what mattered this week.
## ⚡ Threat of the Week
Citrix Warns of Ne
Bugzilla
CVE-2026-100756 firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component
bugzilla·2026-09-29·CVSS 8.1
CVE-2026-100756 [HIGH] CVE-2026-100756 firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component
CVE-2026-100756 firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component
Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Discussion:
This issue has been addressed in the following products:
Red Hat Enterprise Linux 8
Via RHSA-2026:76850 https://access.redhat.com/errata/RHSA-2026:76850
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 10
Via RHSA-2026:76764 https://access.redhat.com/errata/RHSA-2026:76764
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9
Via RHSA-2026:76761 https://access.redhat.com/errata/RHSA-2026:76761
---
This issue has b
https://bugzilla.mozilla.org/show_bug.cgi?id=2047721https://www.mozilla.org/security/advisories/mfsa2026-100/https://www.mozilla.org/security/advisories/mfsa2026-101/https://www.mozilla.org/security/advisories/mfsa2026-102/https://www.mozilla.org/security/advisories/mfsa2026-103/https://www.mozilla.org/security/advisories/mfsa2026-97/https://www.mozilla.org/security/advisories/mfsa2026-98/https://www.mozilla.org/security/advisories/mfsa2026-99/
2026-09-29
Published