CVE-2026-12318
published 2026-06-16CVE-2026-12318: Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
PriorityP339high7.3CVSS 3.1
AVNACLPRNUINSUCLILAL
EPSS
0.26%
18.0th percentile
Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 152 | Firefox 152 |
| mozilla | thunderbird | < Thunderbird 152 | Thunderbird 152 |
| ubuntu | nss | — | — |
CVSS provenance
nvdv3.17.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
vendor_redhat7.3HIGH
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Ubuntu
NSS vulnerability
vendor_ubuntu·2026-06-29
CVE-2026-12318 NSS vulnerability
Title: NSS vulnerability
Summary: NSS could be made to crash or expose sensitive information if it received
specially crafted input.
Haruto Kimura discovered that NSS had incorrecty handled parsing PKCS#11
URI escape sequences. An attacker could possibly use this issue to cause
NSS to crash, resulting in a denial of service, or obtain sensitive
information.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS
vendor_redhat·2026-06-16·CVSS 7.3
CVE-2026-12318 [HIGH] CWE-787 firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS
firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS
Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Incorrect boundary conditions in the Libraries component in NSS
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: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: thunderbird (Red Hat Enterprise Linux
Mozilla
Mozilla Foundation Security Advisory 2026-57: CVE-2026-12318
vendor_mozilla·CVSS 7.3
CVE-2026-12318 [HIGH] Mozilla Foundation Security Advisory 2026-57: CVE-2026-12318
Mozilla Foundation Security Advisory 2026-57
CVE: CVE-2026-12318
Product: Firefox
Impact: high
Fixed in: Firefox 152
Mozilla
Mozilla Foundation Security Advisory 2026-60: CVE-2026-12318
vendor_mozilla·CVSS 7.3
CVE-2026-12318 [HIGH] Mozilla Foundation Security Advisory 2026-60: CVE-2026-12318
Mozilla Foundation Security Advisory 2026-60
CVE: CVE-2026-12318
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 152
VulDB
Mozilla Firefox up to 151 Libraries memory corruption (Nessus ID 321294 / WID-SEC-2026-1959)
vuldb·2026-07-10·CVSS 7.3
CVE-2026-12318 [HIGH] Mozilla Firefox up to 151 Libraries memory corruption (Nessus ID 321294 / WID-SEC-2026-1959)
A vulnerability has been found in Mozilla Firefox up to 151 and classified as critical. This impacts an unknown function of the component Libraries. Performing a manipulation results in memory corruption.
This vulnerability is known as CVE-2026-12318. Remote exploitation of the attack is possible. No exploit is available.
The affected component should be upgraded.
GHSA
Incorrect boundary conditions in the Libraries component in NSS.
ghsa_unreviewed·2026-06-16
CVE-2026-12318 [HIGH] CWE-119 Incorrect boundary conditions in the Libraries component in NSS.
Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 152.
No detection rules found.
No public exploits indexed.
2026-06-16
Published