PatchTheCVECVE-2025-13016: Incorrect boundary conditions in the JavaScript: WebAssembly component
35
Routine
HIGH 7.5UPGRADE
CVE-2025-13016 is a high-severity flaw (CVSS 7.5) affecting firefox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Incorrect boundary conditions in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5.
Why this priority
- High severity
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.4% (top 66%) |
| CISA exploited list | No |
| Weakness | CWE-703 |
| Published | 2025-11-11 |
| Last modified | 2026-10-23 |
Publisher (CNA): Mozilla Corporation · Vendor: mozilla
Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
mozilla firefox UPGRADE
Affected: < 140.5.0 · < 145.0
Fixed in: 140.5.0, 145.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy firefox || rpm -q firefox || firefox --version
2. UPGRADE to 140.5.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade firefox
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade firefox
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Exact fixes by distribution
Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source
sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2
Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source
sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0
Ubuntu 22.04 · firefox · NOT AFFECTED
Ubuntu 24.04 · firefox · NOT AFFECTED
Ubuntu 25.04 · firefox · NOT AFFECTED
Ubuntu 25.10 · firefox · NOT AFFECTED
Ubuntu 24.04 · thunderbird · NOT AFFECTED
Debian 12 · firefox-esr · FIXED · 140.5.0esr-1~deb12u1
sudo apt update && sudo apt install --only-upgrade firefox-esr
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' firefox-esr)" ge "140.5.0esr-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · firefox-esr · FIXED · 140.5.0esr-1~deb13u1
sudo apt update && sudo apt install --only-upgrade firefox-esr
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' firefox-esr)" ge "140.5.0esr-1~deb13u1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · thunderbird · FIXED · 1:140.5.0esr-1~deb12u1
sudo apt update && sudo apt install --only-upgrade thunderbird
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' thunderbird)" ge "1:140.5.0esr-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · thunderbird · FIXED · 1:140.5.0esr-1~deb13u1
sudo apt update && sudo apt install --only-upgrade thunderbird
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' thunderbird)" ge "1:140.5.0esr-1~deb13u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · firefox · FIXED · firefox-140.5.0-2.el10_1
sudo dnf upgrade --advisory=RHSA-2025:21281
rpm -q firefox
RHEL 10 · thunderbird · FIXED · thunderbird-140.5.0-2.el10_1
sudo dnf upgrade --advisory=RHSA-2025:21843
rpm -q thunderbird
RHEL 10.0 Extended Update Support · firefox · FIXED · firefox-140.5.0-2.el10_0
sudo dnf upgrade --advisory=RHSA-2025:21120
rpm -q firefox
RHEL 10.0 Extended Update Support · thunderbird · FIXED · thunderbird-140.5.0-1.el10_0
sudo dnf upgrade --advisory=RHSA-2025:21844
rpm -q thunderbird
RHEL 7 Extended Lifecycle Support · firefox · FIXED · firefox-140.5.0-1.el7_9
sudo dnf upgrade --advisory=RHSA-2025:22371
rpm -q firefox
sudo dnf update --advisory=ALAS2023-2025-1298
sudo yum update --advisory=ALAS2-2025-3108
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-13016?
firefox: upgrade to 140.5.0, 145.0. Exact commands for each OS are on this page.
Is CVE-2025-13016 being exploited?
CVE-2025-13016 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-13016 affect?
CVE-2025-13016 affects firefox. Severity is high (CVSS 7.5). Incorrect boundary conditions in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5.
How urgent is CVE-2025-13016?
Priority 35/100. High severity
Software pages
Mozilla Firefox vulnerabilities
Related CVEs
- CVE-2023-29531 CRITICAL 9.8 UPGRADE UPGRADE An attacker could have caused an out of bounds memory access using WebGL APIs, leading to memory corruption an
- CVE-2023-34416 CRITICAL 9.8 UPGRADE UPGRADE Memory safety bugs present in Firefox 113, Firefox ESR 102.11, and Thunderbird 102.12
- CVE-2026-5731 CRITICAL 9.8 DOWNGRADE DOWNGRADE Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.
- CVE-2023-37202 HIGH 8.8 UPGRADE UPGRADE Cross-compartment wrappers wrapping a scripted proxy could have caused objects from other compartments to be s
- CVE-2023-37211 HIGH 8.8 UPGRADE UPGRADE Memory safety bugs present in Firefox 114, Firefox ESR 102.12, and Thunderbird 102.12