CVE-2026-84894 moxygen - Use After Free

moxygen before commit 004123dd24c3 contains a use-after-free caused by MoQSession::dataStreamReadLoop using a stream read handle after reading a FIN under proxygen's WebTransport API, letting remote attackers trigger stale handle use, exploit requires opening a data stream with an unknown track alias and FIN in the same write.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.26% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
28 September 2026
Updated
15 October 2026
Weakness
CWE-416

Vendor fix

Update to the version after commit 004123dd24c3 or latest available version.

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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