CVE-2026-109773: Denial-of-service in the Sync component
Denial-of-service in the Sync component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 159.0-1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 158 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 158 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 158
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2026-109704
- CVE-2026-109705
- CVE-2026-109706
- CVE-2026-109707
- CVE-2026-109708
- CVE-2026-109709
- CVE-2026-109710
- CVE-2026-109711
- CVE-2026-109712
- CVE-2026-109713
- CVE-2026-109714
- CVE-2026-109715
- CVE-2026-109716
- CVE-2026-109717
- CVE-2026-109718
- CVE-2026-109719
- CVE-2026-109720
- CVE-2026-109721
- CVE-2026-109722
- CVE-2026-109723
- CVE-2026-109724
- CVE-2026-109725
- CVE-2026-109726
- CVE-2026-109727
- CVE-2026-109728
- CVE-2026-109729
- CVE-2026-109730
- CVE-2026-109731
- CVE-2026-109732
- CVE-2026-109733
- CVE-2026-109734
- CVE-2026-109735
- CVE-2026-109736
- CVE-2026-109737
- CVE-2026-109738
- CVE-2026-109739
- CVE-2026-109740
- CVE-2026-109741
- CVE-2026-109742
- CVE-2026-109743
- CVE-2026-109744
- CVE-2026-109745
- CVE-2026-109746
- CVE-2026-109747
- CVE-2026-109748
- CVE-2026-109749
- CVE-2026-109750
- CVE-2026-109751
- CVE-2026-109752
- CVE-2026-109753
- CVE-2026-109754
- CVE-2026-109755
- CVE-2026-109756
- CVE-2026-109757
- CVE-2026-109759
- CVE-2026-109760
- CVE-2026-109761
- CVE-2026-109762
- CVE-2026-109763
- CVE-2026-109764
- CVE-2026-109765
- CVE-2026-109766
- CVE-2026-109767
- CVE-2026-109768
- CVE-2026-109769
- CVE-2026-109770
- CVE-2026-109771
- CVE-2026-109772
- CVE-2026-109773
- CVE-2026-109774
- CVE-2026-109775
- CVE-2026-109776
- CVE-2026-109777
- CVE-2026-109778
- CVE-2026-109779
- CVE-2026-109780
- CVE-2026-109781
- CVE-2026-110247
- CVE-2026-110249
- CVE-2026-106016
Frequently Asked Questions
Which Firefox versions are affected?
The issue was fixed in Firefox 158. The provided information does not identify the first affected version or whether any specific release channels are excluded.
What is known about exploitation requirements and impact?
The reported impact is denial of service in the Sync component. The provided information does not state what attacker access, user interaction, or Sync configuration is required to trigger it.