CVE-2026-2447 | Heap buffer overflow in libvpx

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.

Published: 2026-02-16 Last update: 2026-04-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-2447 is rated Low Risk (36.4/100): CVSS High severity, with low exploitation likelihood (EPSS 0.02%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-2447

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-17 — 0.02% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-2447

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-2447

OS Trackers for CVE-2026-2447

vendor priority summary link
alpine — CVE-2026-2447: 2 source package rows (firefox, thunderbird); 179 state rows across 2 repos (3.23-community, edge-community); fixed 0, open 179. https://security.alpinelinux.org/vuln/CVE-2026-2447
debian unimportant CVE-2026-2447 unimportant priority: Debian including 4 source packages (firefox, firefox-esr, libvpx, thunderbird), 16 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 16. https://security-tracker.debian.org/tracker/CVE-2026-2447
redhat high — https://access.redhat.com/security/cve/CVE-2026-2447
suse high CVE-2026-2447 severity important: SUSE including 74 source package names (13.2-9.1:libsystemd0-254.24-1.1, 13.2-9.1:libudev1-254.24-1.1, …), 241 product×package rows across 66 product lines (Container suse/sl-micro/6.0/baremetal-os-container, Container suse/sl-micro/6.0/base-os-container, … (66 product lines)): Fixed 237, First Fixed 4. https://www.suse.com/security/cve/CVE-2026-2447/
ubuntu medium CVE-2026-2447 medium priority: Ubuntu including 3 source packages (firefox, libvpx, thunderbird), 19 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): not-affected 7, needs-triage 6, released 5, needed 1. https://ubuntu.com/security/CVE-2026-2447

Affected software / configurations for CVE-2026-2447

Vendor Product Version Raw CPE
mozilla firefox < 115.32.1 cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
mozilla firefox < 147.0.4 cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
mozilla firefox >= 116.0, < 140.7.1 cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
mozilla thunderbird < 140.7.2 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
mozilla thunderbird >= 141.0, < 147.0.2 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

References for CVE-2026-2447

cvelogic Threat Intelligence