CVE-2026-8388
published 2026-05-12CVE-2026-8388: Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11…
PriorityP431medium6.5CVSS 3.1
AVNACLPRNUINSUCLILAN
EPSS
0.24%
15.6th percentile
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 150.0.3 | Firefox 150.0.3 |
| mozilla | firefox | < 150.0.3 | 150.0.3 |
| mozilla | firefox_esr | < Firefox ESR 115.36 | Firefox ESR 115.36 |
| mozilla | firefox_esr | < Firefox ESR 140.11 | Firefox ESR 140.11 |
| mozilla | thunderbird | < Thunderbird 140.11 | Thunderbird 140.11 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
vendor_redhat6.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
VulDB
Mozilla Firefox up to 150.0.2 JIT memory corruption (EUVD-2026-29462 / Nessus ID 315326)
vuldb·2026-05-26·CVSS 6.5
CVE-2026-8388 [MEDIUM] Mozilla Firefox up to 150.0.2 JIT memory corruption (EUVD-2026-29462 / Nessus ID 315326)
A vulnerability described as critical has been identified in Mozilla Firefox up to 150.0.2. The impacted element is an unknown function of the component JIT. The manipulation results in memory corruption.
This vulnerability was named CVE-2026-8388. The attack may be performed from remote. There is no available exploit.
Upgrading the affected component is recommended.
GHSA
GHSA-6cv4-3h2g-632h: Incorrect boundary conditions in the JavaScript Engine: JIT component
ghsa_unreviewed·2026-05-12
CVE-2026-8388 [MEDIUM] CWE-119 GHSA-6cv4-3h2g-632h: Incorrect boundary conditions in the JavaScript Engine: JIT component
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.
Red Hat
firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component
vendor_redhat·2026-05-12·CVSS 6.5
CVE-2026-8388 [MEDIUM] CWE-787 firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component
firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Incorrect boundary conditions in the JavaScript Engine: JIT component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Not affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: firefox (Red Hat Enterprise Linux 6) - Not affected
Package: firefox (Red Hat Ente
Mozilla
Mozilla Foundation Security Advisory 2026-45: CVE-2026-8388
vendor_mozilla·CVSS 6.5
CVE-2026-8388 [MEDIUM] Mozilla Foundation Security Advisory 2026-45: CVE-2026-8388
Mozilla Foundation Security Advisory 2026-45
CVE: CVE-2026-8388
Product: Firefox
Impact: high
Fixed in: Firefox 150.0.3
Mozilla
Mozilla Foundation Security Advisory 2026-47: CVE-2026-8388
vendor_mozilla·CVSS 6.5
CVE-2026-8388 [MEDIUM] Mozilla Foundation Security Advisory 2026-47: CVE-2026-8388
Mozilla Foundation Security Advisory 2026-47
CVE: CVE-2026-8388
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.36
Mozilla
Mozilla Foundation Security Advisory 2026-51: CVE-2026-8388
vendor_mozilla·CVSS 6.5
CVE-2026-8388 [MEDIUM] Mozilla Foundation Security Advisory 2026-51: CVE-2026-8388
Mozilla Foundation Security Advisory 2026-51
CVE: CVE-2026-8388
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.11
Mozilla
Mozilla Foundation Security Advisory 2026-48: CVE-2026-8388
vendor_mozilla·CVSS 6.5
CVE-2026-8388 [MEDIUM] Mozilla Foundation Security Advisory 2026-48: CVE-2026-8388
Mozilla Foundation Security Advisory 2026-48
CVE: CVE-2026-8388
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.11
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2036978https://www.mozilla.org/security/advisories/mfsa2026-45/https://www.mozilla.org/security/advisories/mfsa2026-47/https://www.mozilla.org/security/advisories/mfsa2026-48/https://www.mozilla.org/security/advisories/mfsa2026-51/https://access.redhat.com/errata/RHSA-2026:21378https://access.redhat.com/errata/RHSA-2026:21380https://access.redhat.com/errata/RHSA-2026:21381https://access.redhat.com/errata/RHSA-2026:21382https://access.redhat.com/errata/RHSA-2026:22325https://access.redhat.com/errata/RHSA-2026:22643https://access.redhat.com/errata/RHSA-2026:26174https://access.redhat.com/errata/RHSA-2026:26268https://access.redhat.com/errata/RHSA-2026:26269https://access.redhat.com/errata/RHSA-2026:26270https://access.redhat.com/errata/RHSA-2026:26491https://access.redhat.com/errata/RHSA-2026:26492https://access.redhat.com/errata/RHSA-2026:26493https://access.redhat.com/errata/RHSA-2026:26521https://access.redhat.com/errata/RHSA-2026:26536https://access.redhat.com/errata/RHSA-2026:26539https://access.redhat.com/errata/RHSA-2026:26551https://access.redhat.com/errata/RHSA-2026:26606https://access.redhat.com/errata/RHSA-2026:26629https://access.redhat.com/errata/RHSA-2026:26630https://access.redhat.com/errata/RHSA-2026:27715https://access.redhat.com/security/cve/CVE-2026-8388https://bugzilla.redhat.com/show_bug.cgi?id=2476469https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8388.json
2026-05-12
Published