CVE-2026-0889 | Denial-of-service in the DOM: Service Workers component

Exp

Denial-of-service in the DOM: Service Workers component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

Published: 2026-01-13 Last update: 2026-04-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-0889 is rated Exploit Available (59.8/100): CVSS High severity, with low exploitation likelihood (EPSS 0.54%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2026-0889

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-0889

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 2026-06-15 0.02% 0.54% +0.52%
2 2026-02-18 0.05% 0.02% -0.03%
3 2026-02-14 — 0.05% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-0889

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-0889

OS Trackers for CVE-2026-0889

vendor priority summary link
alpine — CVE-2026-0889: 2 source package rows (firefox, thunderbird); 180 state rows across 2 repos (3.23-community, edge-community); fixed 0, open 180. https://security.alpinelinux.org/vuln/CVE-2026-0889
debian not yet assigned CVE-2026-0889 not yet assigned priority: Debian including 1 source packages (firefox), 1 status rows across 1 suites (sid): resolved 1. https://security-tracker.debian.org/tracker/CVE-2026-0889
redhat low — https://access.redhat.com/security/cve/CVE-2026-0889
suse high — https://www.suse.com/security/cve/CVE-2026-0889/
ubuntu medium CVE-2026-0889 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 10 status rows across 5 suites (jammy, noble, plucky, questing, upstream): not-affected 8, needs-triage 2. https://ubuntu.com/security/CVE-2026-0889

Affected software / configurations for CVE-2026-0889

Vendor Product Version Raw CPE
mozilla firefox < 147.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
mozilla thunderbird < 147.0 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

References for CVE-2026-0889

cvelogic Threat Intelligence