CVE-2026-92022
published 2026-09-15CVE-2026-92022: Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3…
PriorityP346high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.32%
23.1th percentile
Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 156 | Firefox 156 |
| mozilla | firefox | < 115.41.0 | 115.41.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 116.0 < 140.16.0 | 140.16.0 |
| mozilla | firefox | >= 141.0 < 153.3.0 | 153.3.0 |
| mozilla | firefox | >= 154.0.0 < 156.0.0 | 156.0.0 |
| mozilla | firefox_esr | < Firefox ESR 115.41 | Firefox ESR 115.41 |
| mozilla | firefox_esr | < Firefox ESR 140.16 | Firefox ESR 140.16 |
| mozilla | firefox_esr | < Firefox ESR 153.3 | Firefox ESR 153.3 |
| mozilla | thunderbird | < Thunderbird 153.3 | Thunderbird 153.3 |
| mozilla | thunderbird | < Thunderbird 156 | Thunderbird 156 |
| mozilla | thunderbird | < Thunderbird 140.16 | Thunderbird 140.16 |
| mozilla | thunderbird | < 140.16.0 | 140.16.0 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 141.0 < 153.3.0 | 153.3.0 |
| mozilla | thunderbird | >= 154.0 < 156.0 | 156.0 |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vendor_redhat7.5HIGH
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Red Hat
firefox: thunderbird: Use-after-free in the DOM: HTML Parser component
vendor_redhat·2026-09-15·CVSS 7.5
CVE-2026-92022 [HIGH] CWE-825 firefox: thunderbird: Use-after-free in the DOM: HTML Parser component
firefox: thunderbird: Use-after-free in the DOM: HTML Parser component
Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Use-after-free in the DOM: HTML Parser component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: thunderbird (Re
Mozilla
Mozilla Foundation Security Advisory 2026-96: CVE-2026-92022
vendor_mozilla
CVE-2026-92022 Mozilla Foundation Security Advisory 2026-96: CVE-2026-92022
Mozilla Foundation Security Advisory 2026-96
CVE: CVE-2026-92022
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-90: CVE-2026-92022
vendor_mozilla
CVE-2026-92022 Mozilla Foundation Security Advisory 2026-90: CVE-2026-92022
Mozilla Foundation Security Advisory 2026-90
CVE: CVE-2026-92022
Product: Firefox
Impact: low
Fixed in: Firefox 156
Mozilla
Mozilla Foundation Security Advisory 2026-91: CVE-2026-92022
vendor_mozilla
CVE-2026-92022 Mozilla Foundation Security Advisory 2026-91: CVE-2026-92022
Mozilla Foundation Security Advisory 2026-91
CVE: CVE-2026-92022
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.41
Mozilla
Mozilla Foundation Security Advisory 2026-92: CVE-2026-92022
vendor_mozilla
CVE-2026-92022 Mozilla Foundation Security Advisory 2026-92: CVE-2026-92022
Mozilla Foundation Security Advisory 2026-92
CVE: CVE-2026-92022
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-93: CVE-2026-92022
vendor_mozilla
CVE-2026-92022 Mozilla Foundation Security Advisory 2026-93: CVE-2026-92022
Mozilla Foundation Security Advisory 2026-93
CVE: CVE-2026-92022
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-94: CVE-2026-92022
vendor_mozilla
CVE-2026-92022 Mozilla Foundation Security Advisory 2026-94: CVE-2026-92022
Mozilla Foundation Security Advisory 2026-94
CVE: CVE-2026-92022
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 156
Mozilla
Mozilla Foundation Security Advisory 2026-95: CVE-2026-92022
vendor_mozilla
CVE-2026-92022 Mozilla Foundation Security Advisory 2026-95: CVE-2026-92022
Mozilla Foundation Security Advisory 2026-95
CVE: CVE-2026-92022
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.16
VulDB
Mozilla Firefox up to 115.40/140.15/153.2/155 HTML Parser use after free (WID-SEC-2026-3375)
vuldb·2026-09-22·CVSS 8.8
CVE-2026-92022 [HIGH] Mozilla Firefox up to 115.40/140.15/153.2/155 HTML Parser use after free (WID-SEC-2026-3375)
A vulnerability marked as critical has been reported in Mozilla Firefox up to 115.40/140.15/153.2/155. This issue affects some unknown processing of the component HTML Parser. The manipulation leads to use after free.
This vulnerability is uniquely identified as CVE-2026-92022. The attack is possible to be carried out remotely. No exploit exists.
It is suggested to upgrade the affected component.
GHSA
Use-after-free in the DOM: HTML Parser component.
ghsa_unreviewed·2026-09-15
CVE-2026-92022 Use-after-free in the DOM: HTML Parser component.
Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-92022 firefox: thunderbird: Use-after-free in the DOM: HTML Parser component
bugzilla·2026-09-15
CVE-2026-92022 [HIGH] CVE-2026-92022 firefox: thunderbird: Use-after-free in the DOM: HTML Parser component
CVE-2026-92022 firefox: thunderbird: Use-after-free in the DOM: HTML Parser component
Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
Hackernews
⚡ Weekly Recap: Cisco 0-Day, AI Agent RCE, ClickFix Attacks, ClickFix Surge, and Browser Hijacks
blogs_hackernews·2026-09-21·CVSS 10.0
CVE-2026-76460 [CRITICAL] ⚡ Weekly Recap: Cisco 0-Day, AI Agent RCE, ClickFix Attacks, ClickFix Surge, and Browser Hijacks
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## ⚡ Weekly Recap: Cisco 0-Day, AI Agent RCE, ClickFix Attacks, ClickFix Surge, and Browser Hijacks
A browser. A plugin. A package. A login screen. Normal stuff. That is basically the problem this week.
The trouble keeps showing up inside things people already trust: code that takes a bad turn, old payloads coming back, exposed systems, weak checks, fake fixes, and attack paths that look almost too easy. Even the research side is getting messy, with more findings, more automation, and not always more clarity.
Nothing here needs much drama. Just a lot of small doors left open. Here’s what happened.
## ⚡ Threat of the Week
C
https://bugzilla.mozilla.org/show_bug.cgi?id=2068059https://www.mozilla.org/security/advisories/mfsa2026-90/https://www.mozilla.org/security/advisories/mfsa2026-91/https://www.mozilla.org/security/advisories/mfsa2026-92/https://www.mozilla.org/security/advisories/mfsa2026-93/https://www.mozilla.org/security/advisories/mfsa2026-94/https://www.mozilla.org/security/advisories/mfsa2026-95/https://www.mozilla.org/security/advisories/mfsa2026-96/
2026-09-15
Published