9.8

CVE-2026-2781: mozilla firefox Integer Overflow or Wraparound

CVSS: 9.8v3.1CriticalModified
AliasesSUSE-SU-2026:0740-1SUSE-SU-2026:0813-1SUSE-SU-2026:0814-1
Published 24-02-2026Last modified 21-04-2026
Open JSON

Vulnerability summary

CVE-2026-2781 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in mozilla firefox. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.2% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.57%
0%100%
Low · +0.21 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 38 · Related 10
DLA-4495-1DLA-4496-1DSA-6148-1DSA-6152-1MGASA-2026-0052OPENSUSE-SU-2026:10242-1

Timeline

  1. 24-02-2026
    PublishedVulnerability first disclosed.
  2. 21-04-2026
    Last modifiedVulnerability information updated.

Description

Integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, Thunderbird 140.8, and Firefox ESR 115.35.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

+0.21 pp

From 0.36% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.57%

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

Suse17 products
  • mozilla-nss&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS< 3.112.3-150400.3.63.1
  • mozilla-nss&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS< 3.112.3-150400.3.63.1
  • mozilla-nss&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS< 3.112.3-150400.3.63.1
  • mozilla-nss&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS< 3.112.3-150400.3.63.1
  • mozilla-nss&distro=SUSE Linux Enterprise Micro 5.2< 3.112.3-150000.3.135.1
Chainguard4 products
  • firefox< 140.8.0-r0
  • firefox-esr< 140.8.0-r0
  • libnss< 3.120.1-r0
  • nss< 3.120.1-r0
Debian3 products
  • firefox-esr< 140.8.0esr-1~deb12u1 | < 140.8.0esr-1~deb13u1 | < 140.8.0esr-1
  • nss< 2:3.121-1 | < 2:3.87.1-1+deb12u2 | < 2:3.110-1+deb13u1 | < 2:3.61-1+deb11u5
  • thunderbird< 1:140.8.0esr-1~deb12u1 | < 1:140.8.0esr-1~deb13u1 | < 1:140.8.0esr-1
Wolfi3 products
  • firefox< 140.8.0-r0
  • libnss< 3.120.1-r0
  • nss< 3.120.1-r0
Mozilla2 products
Ubuntu2 products
  • nss< 2:3.28.4-0ubuntu0.14.04.5+esm13 | < 2:3.28.4-0ubuntu0.16.04.14+esm5 | < 2:3.35-2ubuntu2.16+esm1 | < 2:3.98-0ubuntu0.20.04.2+esm1 | < 2:3.120-1ubuntu1 | < 2:3.98-0ubuntu0.22.04.3 | < 2:3.98-1ubuntu0.1 | < 2:3.114-1ubuntu0.1
  • thunderbirdAll versions (No fix recorded)
Opensuse1 product
  • mozilla-nss&distro=openSUSE Leap 15.6< 3.112.3-150400.3.63.1

7 vendors · 32 products

References

17 links
Show all 17 references