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CVE-2026-8975

37
FAUCET Score

Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

First published: May 19, 2026Last modified: May 26, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 115.36.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
< 151.0.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
>= 140.0, < 140.11.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
< 140.11CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
< 151.0.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.43%
Probability of exploitation in next 30 days
EPSS Percentile
35.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0043 is in the 14th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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-2026:21378
access.redhat.com / errata/RHSA-2026:21380
access.redhat.com / errata/RHSA-2026:21381
access.redhat.com / errata/RHSA-2026:21382
access.redhat.com / errata/RHSA-2026:22325
access.redhat.com / errata/RHSA-2026:22643
access.redhat.com / errata/RHSA-2026:26174
access.redhat.com / errata/RHSA-2026:26268
access.redhat.com / errata/RHSA-2026:26269
access.redhat.com / errata/RHSA-2026:26270
access.redhat.com / errata/RHSA-2026:26491
access.redhat.com / errata/RHSA-2026:26492
access.redhat.com / errata/RHSA-2026:26493
access.redhat.com / errata/RHSA-2026:26521
access.redhat.com / errata/RHSA-2026:26536
access.redhat.com / errata/RHSA-2026:26539
access.redhat.com / errata/RHSA-2026:26551
access.redhat.com / errata/RHSA-2026:26606
access.redhat.com / errata/RHSA-2026:26629
access.redhat.com / errata/RHSA-2026:26630
access.redhat.com / errata/RHSA-2026:27715
access.redhat.com / security/cve/CVE-2026-8975
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-8975.json
bugzilla.mozilla.org / buglist.cgi
Permissions Required
mozilla.org / security/advisories/mfsa2026-46
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-47
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-48
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-50
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-51
Vendor Advisory