CVE-2026-16357: mozilla firefox
CVSS: 9.8v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-16357DEBIAN-CVE-2026-16357CGA-2rch-6fcp-p7wwCGA-67f8-mfmm-h64rCGA-c32c-4pfc-xh63CGA-xcvv-p7h7-c8qqCGA-2rqf-phx2-8vqwCGA-cxwp-6jfq-xwcmCGA-gmjc-qwhm-4q44CGA-m336-w9xv-3rfw
Published 21-07-2026Last modified 22-07-2026
Vulnerability summary
CVE-2026-16357 is a critical (CVSS 9.8) vulnerability in mozilla firefox. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 33.3% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
0.40%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 38 · Related 16MGASA-2026-0325MGASA-2026-0326OPENSUSE-SU-2026:11329-1OPENSUSE-SU-2026:11358-1OPENSUSE-SU-2026:11359-1OPENSUSE-SU-2026:21519-1OPENSUSE-SU-2026:21713-1RHSA-2026:47101RHSA-2026:47104RHSA-2026:47105RHSA-2026:49621RHSA-2026:49921RHSA-2026:49922RHSA-2026:53444RHSA-2026:53445RHSA-2026:53446RHSA-2026:53453RHSA-2026:53454RHSA-2026:53455RHSA-2026:53475RHSA-2026:54180RHSA-2026:54181RHSA-2026:54182RHSA-2026:54185RHSA-2026:54248RHSA-2026:54249RHSA-2026:54259RHSA-2026:54339SUSE-SU-2026:23115-1SUSE-SU-2026:23137-1SUSE-SU-2026:23411-1SUSE-SU-2026:23590-1SUSE-SU-2026:3200-1SUSE-SU-2026:3221-1SUSE-SU-2026:3546-1SUSE-SU-2026:4140-1SUSE-SU-2026:4156-1SUSE-SU-2026:4268-1CGA-QFWW-MCM3-J6HC
Timeline
- 21-07-2026PublishedVulnerability first disclosed.
- 22-07-2026Last modifiedVulnerability information updated.
Description
Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
CVSS metrics
4 scores · 4 sources · 1 versionCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.40%
Chance of exploitation in the next 30 days
Percentile
33%
Versus all other CVEs
30-day change
0.00 pp
From 0.40% on 19-09-2026
19-09-202619-10-2026
EPSS score0.40%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu8 products
- mozjs102All versions (No fix recorded)
- mozjs115All versions (No fix recorded)
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
Chainguard4 products
- firefox< 153.0-r0
- firefox-docker-selenium-compat< 153.0-r0
- firefox-esr< 153.0-r0 | < 153.0-r1
- firefox-esr-140< 140.13.0-r0
Debian2 products
- firefox-esr< 140.13.0esr-1~deb12u1 | < 140.13.0esr-1~deb13u1 | < 140.13.0esr-1
- thunderbird< 1:140.13.0esr-2~deb12u1 | < 1:140.13.0esr-2~deb13u1 | < 1:140.13.0esr-1
Mozilla2 products
- firefox< 115.38.0 | < 153.0.0 | ≥ 128.1.0, < 140.13.0
- thunderbird< 140.13.0 | ≥ 141.0, < 153.0
Wolfi2 products
- firefox< 153.0-r0
- firefox-docker-selenium-compat< 153.0-r0
5 vendors · 18 products
References
11 links- bugzilla.mozilla.org/show_bug.cgi?id=2053326Permissions Required
- www.mozilla.org/security/advisories/mfsa2026-68/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-69/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-70/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-71/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-72/Vendor Advisory
