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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-6785

30
FAUCET Score

Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. 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 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

First published: Apr 21, 2026Last modified: Apr 22, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 115.35.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
< 150.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
>= 140.0, < 140.10.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
>= 140.0, < 140.10.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.51%
Probability of exploitation in next 30 days
EPSS Percentile
40.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0051 is in the 15th percentile among its peer group of 8,920 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

References

access.redhat.com / errata/RHSA-2026:10757
access.redhat.com / errata/RHSA-2026:10766
access.redhat.com / errata/RHSA-2026:10767
access.redhat.com / errata/RHSA-2026:12285
access.redhat.com / errata/RHSA-2026:13537
access.redhat.com / errata/RHSA-2026:15892
access.redhat.com / errata/RHSA-2026:17477
access.redhat.com / errata/RHSA-2026:17687
access.redhat.com / errata/RHSA-2026:17688
access.redhat.com / errata/RHSA-2026:17689
access.redhat.com / errata/RHSA-2026:17690
access.redhat.com / errata/RHSA-2026:19041
access.redhat.com / errata/RHSA-2026:19131
access.redhat.com / errata/RHSA-2026:19201
access.redhat.com / errata/RHSA-2026:19348
access.redhat.com / errata/RHSA-2026:19461
access.redhat.com / errata/RHSA-2026:19462
access.redhat.com / errata/RHSA-2026:19463
access.redhat.com / errata/RHSA-2026:19464
access.redhat.com / errata/RHSA-2026:19465
access.redhat.com / errata/RHSA-2026:19466
access.redhat.com / errata/RHSA-2026:19467
access.redhat.com / errata/RHSA-2026:19468
access.redhat.com / errata/RHSA-2026:19469
access.redhat.com / errata/RHSA-2026:19542
access.redhat.com / errata/RHSA-2026:19655
access.redhat.com / errata/RHSA-2026:19704
access.redhat.com / security/cve/CVE-2026-6785
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-6785.json
bugzilla.mozilla.org / buglist.cgi
Broken Link
mozilla.org / security/advisories/mfsa2026-30
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-31
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-32
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-33
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-34
Vendor Advisory