Is there a public exploit for CVE-2026-119234?

No public exploit for CVE-2026-119234 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

What does CVE-2026-119234 affect?

CVE-2026-119234 affects Facebook mvfst.

— Unscored

mvfst did not adequately merge or compact out-of-order STREAM frame data, and a small received fragment could keep a much larger receive…

CVE-2026-119234

mvfst did not adequately merge or compact out-of-order STREAM frame data, and a small received fragment could keep a much larger receive buffer alive. QUIC flow control limits the number of buffered stream bytes, but not this per-fragment memory and bookkeeping. A remote, unauthenticated QUIC peer could send many small, non-contiguous stream fragments to make an endpoint consume memory far in excess of its advertised receive window and spend increasing CPU time reassembling stream data, leading to denial of service. This issue affects mvfst versions prior to v2026.11.09.0.

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 11 November 2026
Last updated: 11 November 2026
Affected: Facebook · mvfst
Assigner: Meta

At the source

EUVD (ENISA)

References

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