9.6

CVE-2026-92035: mozilla firefox

CVSS: 9.6v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-92035DEBIAN-CVE-2026-92035
Published 15-09-2026Last modified 30-09-2026
Open JSON

Vulnerability summary

CVE-2026-92035 is a critical (CVSS 9.6) vulnerability in mozilla firefox. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.6% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.6/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.33%
0%100%
Low · +0.18 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 8
OPENSUSE-SU-2026:11796-1OPENSUSE-SU-2026:11826-1OPENSUSE-SU-2026:12098-1OPENSUSE-SU-2026:21951-1SUSE-SU-2026:23918-1SUSE-SU-2026:4247-1

Timeline

  1. 15-09-2026
    PublishedVulnerability first disclosed.
  2. 30-09-2026
    Last modifiedVulnerability information updated.

Description

Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Thunderbird 140.17, Firefox 156, Firefox ESR 153.3, Thunderbird 156, Thunderbird 153.3, Firefox ESR 115.42, and Firefox ESR 140.17.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

25%

Versus all other CVEs

30-day change

+0.18 pp

From 0.15% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.33%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected 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)
Mozilla2 products
  • firefox< 115.42.0 | ≥ 116.0, < 140.17.0 | ≥ 141.0, < 153.3.0 | ≥ 154.0.0, < 156.0.0
  • thunderbird< 140.17.0 | ≥ 141.0, < 153.3.0 | ≥ 154.0, < 156.0
Debian1 product
  • thunderbird< 1:140.17.0esr-1~deb12u1 | < 1:140.17.0esr-1~deb13u1 | < 1:153.3.0esr-1

3 vendors · 11 products

References

12 links
Show all 12 references