CVE-2026-7324
Published: 28 April 2026
Summary
CVE-2026-7324 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Mozilla Firefox. Its CVSS base score is 7.3 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 4.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-7324 encompasses multiple memory safety bugs (CWE-119) present in Thunderbird 150.0.0. These bugs demonstrate evidence of memory corruption, which Mozilla assesses as potentially exploitable with sufficient effort to enable arbitrary code execution. The vulnerability carries a CVSS v3.1 base score of 7.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) and was published on 2026-04-28.
The attack scenario involves remote, unauthenticated attackers exploiting the flaws over the network with low attack complexity and no user interaction required. Exploitation could yield low impacts on confidentiality, integrity, and availability, though the memory corruption nature suggests a pathway to more severe outcomes like arbitrary code execution if chained or refined.
Mozilla's security advisories MFSA2026-35 and MFSA2026-38 detail the issues, with fixes applied in Thunderbird 150.0.1 and Firefox 150.0.1. Additional technical information is available in the Bugzilla entries for bugs 2029419, 2029717, 2029769, and 2029886, recommending immediate updates to patched versions for mitigation.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-26061
Vulnerability details
Memory safety bugs present in Thunderbird 150.0.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox…
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150.0.1 and Thunderbird 150.0.1.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Memory corruption vulnerability in Thunderbird (email client) enabling remote arbitrary code execution with no user interaction directly maps to Exploitation for Client Execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires timely identification, reporting, and correction of flaws like the memory safety bugs in Thunderbird 150.0.0 through patching to 150.0.1.
Implements memory protections such as non-executable memory regions and address space randomization to block arbitrary code execution from memory corruption exploits.
Conducts vulnerability scanning to identify the presence of CVE-2026-7324 in Thunderbird installations, enabling prioritized remediation.