CVE-2026-12326
published 2026-06-16CVE-2026-12326: Memory safety bugs present in Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort…
PriorityP345high8.1CVSS 3.1
AVNACHPRNUINSUCHIHAH
EPSS
0.25%
16.3th percentile
Memory safety bugs present in Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 152 | Firefox 152 |
| mozilla | firefox | < 152.0.0 | 152.0.0 |
| mozilla | thunderbird | < Thunderbird 152 | Thunderbird 152 |
| mozilla | thunderbird | < 152.0.0 | 152.0.0 |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_redhat7.3HIGH
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Red Hat
firefox: thunderbird: Memory safety bugs fixed in Firefox 152 and Thunderbird 152
vendor_redhat·2026-06-16·CVSS 7.3
CVE-2026-12326 [HIGH] CWE-825 firefox: thunderbird: Memory safety bugs fixed in Firefox 152 and Thunderbird 152
firefox: thunderbird: Memory safety bugs fixed in Firefox 152 and Thunderbird 152
Memory safety bugs present in Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Memory safety bugs present in Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
Statement: Red Hat Product Security rates the severity of this flaw as determined by the
GitLab
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Jirafeau
vendor_gitlab·2026-01-28·CVSS 6.1
CVE-2026-1466 [MEDIUM] CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Jirafeau
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Jirafeau
Jirafeau normally prevents browser preview for text files due to the possibility that for example SVG and HTML documents could be exploited for cross site scripting. This was done by storing the MIME type of a file and allowing only browser preview for MIME types beginning with image (except for image/svg+xml, see CVE-2022-30110, CVE-2024-12326 and CVE-2025-7066), video and audio. However, it was possible to bypass this check by sending a manipulated HTTP request with an invalid MIME type like image. When doing the preview, the browser tries to automatically detect the MIME type resulting in detecting SVG and possibly executing JavaScript code. To prevent this, MIME sniffing is disabled by sen
Mozilla
Mozilla Foundation Security Advisory 2026-57: CVE-2026-12326
vendor_mozilla·CVSS 7.3
CVE-2026-12326 [HIGH] Mozilla Foundation Security Advisory 2026-57: CVE-2026-12326
Mozilla Foundation Security Advisory 2026-57
CVE: CVE-2026-12326
Product: Firefox
Impact: high
Fixed in: Firefox 152
Mozilla
Mozilla Foundation Security Advisory 2026-60: CVE-2026-12326
vendor_mozilla·CVSS 7.3
CVE-2026-12326 [HIGH] Mozilla Foundation Security Advisory 2026-60: CVE-2026-12326
Mozilla Foundation Security Advisory 2026-60
CVE: CVE-2026-12326
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 152
VulDB
Mozilla Firefox up to 151 memory corruption (Nessus ID 321417 / WID-SEC-2026-1959)
vuldb·2026-07-03·CVSS 8.1
CVE-2026-12326 [HIGH] Mozilla Firefox up to 151 memory corruption (Nessus ID 321417 / WID-SEC-2026-1959)
A vulnerability, which was classified as critical, has been found in Mozilla Firefox up to 151. This issue affects some unknown processing. The manipulation leads to memory corruption.
This vulnerability is traded as CVE-2026-12326. It is possible to initiate the attack remotely. There is no exploit available.
It is advisable to upgrade the affected component.
GHSA
Memory safety bugs present in Firefox 151 and Thunderbird 151.
ghsa_unreviewed·2026-06-16
CVE-2026-12326 [HIGH] CWE-119 Memory safety bugs present in Firefox 151 and Thunderbird 151.
Memory safety bugs present in Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-12326 firefox: thunderbird: Memory safety bugs fixed in Firefox 152 and Thunderbird 152
bugzilla·2026-06-16·CVSS 7.3
CVE-2026-12326 [HIGH] CVE-2026-12326 firefox: thunderbird: Memory safety bugs fixed in Firefox 152 and Thunderbird 152
CVE-2026-12326 firefox: thunderbird: Memory safety bugs fixed in Firefox 152 and Thunderbird 152
Memory safety bugs present in Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152.
Hackernews
⚡ Weekly Recap: Browser Bugs, EDR Killers, TV Botnet, OpenBSD Flaw, Android Trojan, and More
blogs_hackernews·2026-06-22·CVSS 9.8
CVE-2026-24858 [CRITICAL] ⚡ Weekly Recap: Browser Bugs, EDR Killers, TV Botnet, OpenBSD Flaw, Android Trojan, and More
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## ⚡ Weekly Recap: Browser Bugs, EDR Killers, TV Botnet, OpenBSD Flaw, Android Trojan, and More
It’s Monday again.
This week’s threat list looks painfully familiar: abused integrations, fake tools, poisoned websites, ransomware crews trying to shut down security tools, and mobile malware asking for way too much control.
The annoying part is how little of this feels new. Weak credentials, sketchy downloads, browser extensions with too much access, and WordPress sites are used to push more attacks. Nothing clever. Just sloppy, cheap, and effective.
Here’s the Monday recap. Let’s get into the week’s mess.
## ⚡ Threat of the We
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1767455%2C2004308%2C2024445%2C2028182%2C2029765%2C2029883%2C2030110%2C2030149%2C2030366%2C2030374%2C2030564%2C2031120%2C2033411%2C2038695%2C2042465%2C2042781%2C2042907https://bugzilla.mozilla.org/buglist.cgi?bug_id=2021955%2C2025960%2C2029066%2C2029403%2C2029435%2C2029803%2C2030570%2C2030573%2C2032264%2C2033234%2C2034816%2C2035907%2C2035963%2C2036895%2C2036898%2C2036907%2C2036909%2C2036928%2C2036931%2C2036932%2C2036934%2C2039238%2C2039463https://bugzilla.mozilla.org/buglist.cgi?bug_id=2039050%2C2042718%2C2042760%2C2044831%2C2045307%2C2045398%2C2045516%2C2045572%2C2041741%2C2044433https://www.mozilla.org/security/advisories/mfsa2026-57/https://www.mozilla.org/security/advisories/mfsa2026-60/https://access.redhat.com/security/cve/CVE-2026-12326https://bugzilla.redhat.com/show_bug.cgi?id=2489222https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12326.json
2026-06-16
Published