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VulnerabilityPublished

CVE-2026-119234: Facebook mvfst · Unthrottled Resource Allocation

Affects Facebook mvfstSource CVE Database V5

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Not known to be exploited : upgrade to v2026.11.09.0 soon.

Data as of 11 Nov 2026, 17:31 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in v2026.11.09.0

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Upgrade Facebook mvfst to v2026.11.09.0.

Affected software

ProductAffectedFixed in
FacebookmvfstAffected
  • <2026.11.09.0
Fixed in
  • v2026.11.09.0

AI-suggested

Upgrade mvfst to version v2026.11.09.0 or later, where this vulnerability has been fixed. No additional mitigation is required once the update is applied.

Description

A vulnerability in Facebook's mvfst prior to version 2026.11.09.0 allows a remote unauthenticated QUIC peer to cause excessive memory consumption and CPU usage by sending many small, non-contiguous stream fragments. This happens because mvfst does not properly merge or compact out-of-order STREAM frame data, leading to denial of service.

References

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