CVE-2026-119235: Facebook proxygen · Unthrottled Resource Allocation
Affects Facebook proxygenSource CVE Database V5
Not known to be exploited : upgrade to v2026.11.09.00 soon.
Data as of 11 Nov 2026, 17:31 UTC
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
Disclosed: evidence found.
CVE published 11 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| Facebookproxygen | Affected
| Fixed in
|
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.