CVE-2026-16355
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140
CVSS
9.8
Critical
EPSS
0.4%
p35
KEV
—
Exploit Today
11
0-100
Published: Jul 21, 2026 · Last modified: Jul 22, 2026 · CWE-843
0.2%EPSS · 30 days0.4%
2026-07-222026-07-23
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=2052207
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-68/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-69/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-70/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-71/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-72/
CVECVSSEPSSKEVRExploitTitleMod.
CVE-2026-130666.5 MED30.3%
——9Improper handling of DBPointer objects during BSON serialization in MongoDB's server-side JavaScript engine can result in internal process memory contents being included in data returned to the client. This constitutes an unintended information disclosure affecting deployments that use server-side JavaScript.2dCVE-2026-16420—15.5%
——5Type Confusion in WebAudio in Google Chrome prior to 150.0.7871.182 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)23hCVE-2026-164109.8 CRI24.1%
——7JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.2dCVE-2026-163639.8 CRI33.8%
——10JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.2dCVE-2026-646089.8 CRI29.7%
——9Heap type confusion and out-of-bounds read/write in the Apache Fory C++ implementation. When deserializing data in compatible mode, the field-skip paths do not correctly validate the declared field types against the actual data, so input with an inconsistent schema can cause type confusion and out-of-bounds memory access. Only the C++ implementation is affected; other language implementations of Apache Fory are not.
This issue affects Apache Fory C++: from 0.14.0 before 1.4.0.
Users are recommended to upgrade to version 1.4.0, which fixes the issue.3dCVE-2026-157768.8 HIG25.1%
——8Inappropriate implementation in V8 in Google Chrome prior to 150.0.7871.125 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)9d