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VulnerabilityPublished

CVE-2026-119237: Facebook proxygen · Unthrottled Resource Allocation

Affects Facebook proxygenSource CVE Database V5

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Not known to be exploited : upgrade to v2026.11.09.00 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 v2026.11.09.00

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 proxygen to v2026.11.09.00.

Affected software

ProductAffectedFixed in
FacebookproxygenAffected
  • <2026.11.09.00
Fixed in
  • v2026.11.09.00

AI-suggested

Upgrade proxygen to version v2026.11.09.00 or later, where this vulnerability is fixed. No other mitigation is indicated by the vendor advisory.

Description

A vulnerability in Facebook's proxygen HTTP/3 session handling allows a remote unauthenticated attacker to cause excessive memory and CPU usage by sending specially crafted HEADERS blocks referencing QPACK dynamic table entries that are never received. This leads to denial of service due to resource exhaustion. The issue affects proxygen versions prior to v2026.11.09.00 and is fixed in that version.

References

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