7.3

CVE-2026-12318: mozilla firefox

CVSS: 7.3v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-12318USN-8481-1DEBIAN-CVE-2026-12318
Published 16-06-2026Last modified 16-06-2026
Open JSON

Vulnerability summary

CVE-2026-12318 is a high (CVSS 7.3) vulnerability in mozilla firefox. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.1% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.26%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2026:11052-1OPENSUSE-SU-2026:11373-1CGA-R92X-9RQ4-X7F8

Timeline

  1. 16-06-2026
    PublishedVulnerability first disclosed.
  2. 16-06-2026
    Last modifiedVulnerability information updated.

Description

Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

0.00 pp

From 0.26% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.26%

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

Ubuntu9 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
Chainguard1 product
  • firefox< 152-r0
Debian1 product
  • nss< 2:3.87.1-1+deb12u3 | < 2:3.110-1+deb13u3 | < 2:3.124-1
Wolfi1 product
  • firefox< 152-r0

5 vendors · 14 products

References

8 links