CVE-2026-63126 Wire - Denial of Service

Wire protobuf readers prior to 6.4.5 and 7.0.0-alpha04 contain a denial of service vulnerability caused by inconsistent validation of attacker-controlled lengths in protobuf decoding, letting attackers cause crashes or excessive allocation, exploit requires supplying malformed protobuf bytes.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.82% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-190

Vendor fix

Update to versions 6.4.5 or 7.0.0-alpha04 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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