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VulnerabilityPublished

CVE-2026-119235: 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 mitigations are indicated by the vendor advisory.

Description

CVE-2026-119235 is a vulnerability in Facebook's proxygen library affecting its QPACK decoder. The decoder enforces size limits on string literals only after fully receiving them, allowing a remote unauthenticated HTTP/3 peer to send an insert instruction declaring an arbitrarily large literal. This causes unbounded buffering in the decoder, exhausting memory and resulting in a denial of service. The issue affects proxygen versions before v2026.11.09.00.

References

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