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Mozilla Firefox NSS CVE-2026-6772

| EUVDEUVD-2026-24113 HIGH
Improper Check for Unusual or Exceptional Conditions (CWE-754)
2026-04-21 mozilla GHSA-c2q7-642g-3vwr
Information Disclosure Mozilla Red Hat Suse
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SUSE
HIGH
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

8
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Updated
Apr 22, 2026 - 00:35 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 22, 2026 - 00:22 vuln.today
cvss_changed
Analysis Generated
Apr 21, 2026 - 20:25 vuln.today
CVSS changed
Apr 21, 2026 - 20:22 NVD
7.5 (HIGH)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24113
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:41 nvd
HIGH 7.5

DescriptionCVE.org

Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10.

AnalysisAI

Information disclosure in Mozilla Firefox NSS Library component allows remote unauthenticated attackers to extract high-value confidential data via network-accessible boundary condition errors. Affects Firefox versions prior to 150, ESR 115.x prior to 115.35, and ESR 140.x prior to 140.10. SSVC framework classifies as automatable with partial technical impact. No public exploit identified at time of analysis, though SSVC automation rating and CVSS:3.1/AV:N/AC:L/PR:N/UI:N vector indicate straightforward exploitation potential once vulnerability details are published.

Technical ContextAI

Network Security Services (NSS) is Mozilla's cryptographic library implementing TLS/SSL, certificate validation, and PKCS standards used across Firefox, Thunderbird, and other products. CWE-754 boundary condition errors occur when software fails to properly check input/output limits, often in buffer operations, array indexing, or protocol message parsing. In cryptographic libraries like NSS, such flaws frequently manifest during certificate parsing, ASN.1 decoding, or TLS handshake processing where improper length validation can expose memory contents. The CPE string cpe:2.3:a:mozilla:firefox confirms the Firefox application stack as affected, though NSS is distributed as a separate library used by multiple Mozilla products. Given the high confidentiality impact (C:H) with no integrity or availability consequences, this likely involves information leakage rather than memory corruption - suggesting scenarios like padding oracle attacks, timing side-channels in cryptographic operations, or unintended memory disclosure through crafted protocol messages.

RemediationAI

Immediately upgrade to patched versions: Firefox 150, Firefox ESR 115.35, or Firefox ESR 140.10 as detailed in Mozilla Security Advisories at https://www.mozilla.org/security/advisories/mfsa2026-30/, https://www.mozilla.org/security/advisories/mfsa2026-31/, and https://www.mozilla.org/security/advisories/mfsa2026-32/. Enterprise environments on ESR tracks should prioritize the ESR 115.35 or 140.10 updates to maintain long-term support compatibility. If immediate patching is infeasible, implement network-layer controls to restrict Firefox's exposure to untrusted network sources: deploy TLS-intercepting proxies to filter malformed certificate chains or ASN.1 structures (Note: This introduces performance overhead and may break certificate pinning), enforce browser isolation technologies like Windows Defender Application Guard to sandbox information disclosure impact, or temporarily prohibit Firefox use for accessing sensitive applications until patches deploy (Trade-off: Users may resort to unmanaged browsers, increasing overall risk). Review application logs and TLS session data for anomalies during the vulnerability window, though detecting exploitation retrospectively is challenging without specifics on the leaked information's characteristics.

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Same weakness CWE-754 – Improper Check for Unusual or Exceptional Conditions

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
openSUSE Leap 16.0 Fixed

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CVE-2026-6772 vulnerability details – vuln.today
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