Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2026-2785 is a critical-severity Access of Uninitialized Pointer (CWE-824) vulnerability in Mozilla Firefox. Its CVSS base score is 9.8 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Steganography (T1001.002); ranked at the 40th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SA-15 (Development Process, Standards, and Tools) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-2785 is an invalid pointer vulnerability (CWE-824) in the JavaScript Engine component of Mozilla products. It affects Firefox versions prior to 148, Firefox ESR versions prior to 140.8, Thunderbird versions prior to 148, and Thunderbird versions prior to 140.8. The issue has a CVSS v3.1 base score of 9.8, indicating critical severity.
Remote attackers require no privileges or user interaction to exploit this vulnerability over the network with low complexity. Successful exploitation can result in high impacts to confidentiality, integrity, and availability, potentially allowing arbitrary code execution within the context of the affected browser or email client.
Mozilla security advisories (MFSA 2026-13, 15, 16, and 17) and the associated Bugzilla entry detail the patch releases that address the vulnerability. Mitigation involves updating to Firefox 148, Firefox ESR 140.8, Thunderbird 148, or Thunderbird 140.8, as these versions include the necessary fixes for the invalid pointer dereference in the JavaScript Engine.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-8506
Vulnerability Data
Invalid pointer in the JavaScript Engine component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Developer testing and evaluation can discover uninitialized pointer accesses through static analysis, dynamic testing, or fuzzing before deployment.
Requiring documented development processes and tools enables use of analyzers or coding standards that identify uninitialized pointer defects.
Security engineering principles can mandate memory-safety practices and language choices that structurally avoid uninitialized pointer use.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly prevent uninitialized pointer bugs via coding standards, analysis, and reviews, but eliminating this single weakness only partially fulfills the broader control.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.