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Mozilla CVE-2026-2781

CRITICAL
Integer Overflow or Wraparound (CWE-190)
2026-02-24 security@mozilla.org
Integer Overflow Mozilla Buffer Overflow
Critical
Disputed · 9.8 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Red Hat
6.1 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Updated
Apr 21, 2026 - 13:27 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 21, 2026 - 13:22 vuln.today
cvss_changed
Patch released
Apr 10, 2026 - 08:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Feb 24, 2026 - 14:16 nvd
CRITICAL 9.8

DescriptionCVE.org

Integer overflow in the Libraries component in NSS. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

AnalysisAI

Integer overflow in NSS (Network Security Services) cryptographic library enables remote unauthenticated attackers to achieve arbitrary code execution with critical impact on confidentiality, integrity, and availability across Mozilla Firefox (<148, ESR <140.8) and Thunderbird (<148, ESR <140.8). The vulnerability carries a maximum CVSS 9.8 score with no exploitation barriers, though EPSS probability remains low (0.04%, 14th percentile) and no active exploitation is confirmed. Vendor patches available through Mozilla security advisories MFSA2026-13/15/16/17 with corresponding Red Hat updates deployed across enterprise distributions.

Technical ContextAI

NSS (Network Security Services) is Mozilla's cross-platform cryptographic library providing SSL/TLS implementation, certificate handling, and cryptographic primitives used by Firefox, Thunderbird, and numerous third-party applications. CWE-190 integer overflow occurs when arithmetic operations exceed maximum representable values, typically causing wraparound to small values that bypass buffer size checks. In cryptographic libraries, integer overflows during memory allocation or buffer size calculations can lead to heap buffer overflows when subsequent operations write beyond allocated boundaries. The NSS Libraries component processes untrusted network data during TLS handshakes and certificate validation, making integer handling errors in this context remotely exploitable without authentication. CPE strings confirm impact spans both regular and ESR (Extended Support Release) channels across Firefox desktop browser and Thunderbird email client.

RemediationAI

Upgrade Mozilla Firefox to version 148 or later (regular channel) or Firefox ESR to version 140.8 or later as specified in Mozilla Security Advisories MFSA2026-13 and MFSA2026-15 available at mozilla.org/security/advisories. Upgrade Mozilla Thunderbird to version 148 or later (regular channel) or Thunderbird ESR to version 140.8 or later per MFSA2026-16 and MFSA2026-17. Enterprise environments using Red Hat Enterprise Linux should apply vendor-specific updates through RHSA-2026:3338, RHSA-2026:3361, RHSA-2026:3492, RHSA-2026:3515, RHSA-2026:3517, RHSA-2026:3976, RHSA-2026:3984, or RHSA-2026:4260 depending on RHEL version and product variant. Debian LTS users should follow guidance at lists.debian.org/debian-lts-announce/2026/03/msg00012.html. Consumer Firefox installations with auto-update enabled should receive patches automatically. No effective workarounds exist for cryptographic library vulnerabilities; disabling NSS would break all TLS functionality rendering applications unusable. Compensating controls are not viable - patching is the only remediation path.

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Same weakness CWE-190 – Integer Overflow or Wraparound

View all
CVE-2013-2729 CRITICAL POC
9.8
CVE-2015-8651 HIGH
8.8
CVE-2012-5054 HIGH POC
8.8
CVE-2014-0569 CRITICAL POC
9.3
CVE-2017-3599 HIGH POC
7.5
CVE-2017-7529 HIGH
7.5
CVE-2016-1010 HIGH
8.8
CVE-2013-3940 CRITICAL
9.3

Same technique Integer Overflow

View all
CVE-2014-0497 CRITICAL POC
9.8
CVE-2013-2729 CRITICAL POC
9.8
CVE-2015-8651 HIGH
8.8
CVE-2012-5054 HIGH POC
8.8
CVE-2014-0569 CRITICAL POC
9.3
CVE-2017-3599 HIGH POC
7.5
CVE-2017-7529 HIGH
7.5
CVE-2016-1010 HIGH
8.8

Vendor StatusVendor

SUSE

Severity: High
Product Status
Container suse/manager/5.0/x86_64/server-attestation:latest Container suse/manager/5.0/x86_64/server:latest Container suse/sle-micro/base-5.5:2.0.4-5.8.248 Container suse/sle-micro/kvm-5.5:2.0.4-3.5.476 Image server-attestation-image Image server-image Affected
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.61 Container suse/sl-micro/6.0/base-os-container:2.1.3-7.27 Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.52 Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.63 Container suse/sl-micro/6.0/toolbox:13.2-9.16 Image SL-Micro Affected
Image SL-Micro-BYOS-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Affected
Image SLES12-SP5-EC2-SAP-BYOS Affected
Image SLES12-SP5-SAP-Azure-LI-BYOS-Production Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production Affected

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CVE-2026-2781 vulnerability details – vuln.today
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