CVE-2026-6753
Description
Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Incorrect boundary conditions in Mozilla's WebRTC component could allow an attacker to trigger memory corruption, leading to potential arbitrary code execution.
CVE-2026-6753 is a high-severity vulnerability in the WebRTC component of Mozilla Firefox and Thunderbird. The issue stems from incorrect boundary conditions, which can lead to memory corruption when processing specially crafted WebRTC data [1][2].
An attacker could exploit this vulnerability by enticing a user to visit a malicious website or by injecting crafted WebRTC traffic. In Thunderbird, scripting is disabled by default when reading email, so exploitation through email is unlikely, but it remains a risk in browser-like contexts [1][3].
Successful exploitation could allow an attacker to corrupt memory, potentially leading to arbitrary code execution or a denial of service. The CVSS v3 score is 7.3, indicating high severity.
Mozilla has addressed this vulnerability in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. Users are advised to update their software to the latest versions [2][4].
AI Insight generated on May 18, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
3cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <150.0
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <140.10.0
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*Range: >=140.0,<140.10.0
Patches
0No patches discovered yet.
Vulnerability mechanics
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References
5- www.mozilla.org/security/advisories/mfsa2026-30/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-32/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-33/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-34/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
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