CVE-2026-2447 Heap buffer overflow in libvpx
High 8.8
Published
Updated
Check this codebase for CVE-2026-2447 and fix it if it is affected.
What it is: CVE-2026-2447 is a high-severity memory corruption vulnerability in Mozilla Firefox, published on 16 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-2447 in the wild and no public exploit code.
Affected product: Mozilla Firefox. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-2447/ (Markdown: https://insights.sbomify.com/CVE-2026-2447/index.md)
Heap buffer overflow in libvpx allows attackers to execute arbitrary code via malicious media content in Firefox and Thunderbird.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-2447?
CVE-2026-2447 is a high-severity memory corruption vulnerability in Mozilla Firefox, published on 16 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.
Weakness: CWE-122
Which versions are affected by CVE-2026-2447?
It affects 2 products.
Linux distribution packages (40)
libvpx AlmaLinux:10 | All versions | 1.14.1-6.el10_1 |
libvpx-devel AlmaLinux:10 | All versions | 1.14.1-6.el10_1 |
libvpx AlmaLinux:8 | All versions | 1.7.0-13.el8_10 |
libvpx-devel AlmaLinux:8 | All versions | 1.7.0-13.el8_10 |
libvpx AlmaLinux:9 | All versions | 1.9.0-10.el9_7 |
libvpx-devel AlmaLinux:9 | All versions | 1.9.0-10.el9_7 |
libvpx Red Hat:enterprise_linux:10.1 | All versions | 0:1.14.1-6.el10_1 |
libvpx-debuginfo Red Hat:enterprise_linux:10.1 | All versions | 0:1.14.1-6.el10_1 |
libvpx-debugsource Red Hat:enterprise_linux:10.1 | All versions | 0:1.14.1-6.el10_1 |
libvpx-devel Red Hat:enterprise_linux:10.1 | All versions | 0:1.14.1-6.el10_1 |
libvpx-utils-debuginfo Red Hat:enterprise_linux:10.1 | All versions | 0:1.14.1-6.el10_1 |
libvpx Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-13.el8_10 |
libvpx-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-13.el8_10 |
libvpx-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-13.el8_10 |
libvpx-utils-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-13.el8_10 |
libvpx-debuginfo Red Hat:enterprise_linux:8::crb | All versions | 0:1.7.0-13.el8_10 |
libvpx-debugsource Red Hat:enterprise_linux:8::crb | All versions | 0:1.7.0-13.el8_10 |
libvpx-devel Red Hat:enterprise_linux:8::crb | All versions | 0:1.7.0-13.el8_10 |
libvpx-utils-debuginfo Red Hat:enterprise_linux:8::crb | All versions | 0:1.7.0-13.el8_10 |
libvpx Red Hat:enterprise_linux:9::appstream | All versions | 0:1.9.0-10.el9_7 |
libvpx-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:1.9.0-10.el9_7 |
libvpx-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 0:1.9.0-10.el9_7 |
libvpx-utils-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:1.9.0-10.el9_7 |
libvpx-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 0:1.9.0-10.el9_7 |
libvpx-debugsource Red Hat:enterprise_linux:9::crb | All versions | 0:1.9.0-10.el9_7 |
libvpx-devel Red Hat:enterprise_linux:9::crb | All versions | 0:1.9.0-10.el9_7 |
libvpx-utils-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 0:1.9.0-10.el9_7 |
libvpx Red Hat:enterprise_linux_eus:10.0 | All versions | 0:1.14.1-3.el10_0.1 |
libvpx-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:1.14.1-3.el10_0.1 |
libvpx-debugsource Red Hat:enterprise_linux_eus:10.0 | All versions | 0:1.14.1-3.el10_0.1 |
libvpx-devel Red Hat:enterprise_linux_eus:10.0 | All versions | 0:1.14.1-3.el10_0.1 |
libvpx-utils-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:1.14.1-3.el10_0.1 |
libvpx Red Hat:rhel_aus:8.2::appstream | All versions | 0:1.7.0-8.el8_2.2 |
libvpx-debuginfo Red Hat:rhel_aus:8.2::appstream | All versions | 0:1.7.0-8.el8_2.2 |
libvpx-debugsource Red Hat:rhel_aus:8.2::appstream | All versions | 0:1.7.0-8.el8_2.2 |
libvpx-utils-debuginfo Red Hat:rhel_aus:8.2::appstream | All versions | 0:1.7.0-8.el8_2.2 |
libvpx Red Hat:rhel_aus:8.4::appstream | All versions | 0:1.7.0-10.el8_4.2 |
libvpx-debuginfo Red Hat:rhel_aus:8.4::appstream | All versions | 0:1.7.0-10.el8_4.2 |
libvpx-debugsource Red Hat:rhel_aus:8.4::appstream | All versions | 0:1.7.0-10.el8_4.2 |
libvpx-utils-debuginfo Red Hat:rhel_aus:8.4::appstream | All versions | 0:1.7.0-10.el8_4.2 |
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2026-2447?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-2447 being exploited?
There is no known exploitation of CVE-2026-2447 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as ALSA-2026:3967, ALSA-2026:4447, ALSA-2026:4629, CLSA-2026-1773830081, CLSA-2026-1773832252, DEBIAN-CVE-2026-2447 and 31 more.