# Meta Proxygen vulnerabilities

Source: https://junglewise.ai/threats/technologies/meta-proxygen  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/meta-proxygen.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 6 vulnerabilities in Meta Proxygen: 4 in the last 7 days and 6 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-121737, was published on 11 November 2026. Nothing in the last four weeks, down from 2 vulnerabilities in the four before.

## Counts

- Last 7 days: 4
- Last 30 days: 4
- Last 90 days: 6
- All time: 6 (0 critical, 0 exploited in the wild)

## About Meta Proxygen

Meta's C++ library for building high-performance HTTP services and proxies.

## Latest Meta Proxygen vulnerabilities

- [CVE-2026-121737: Meta proxygen use-after-free in HTTP session handling](https://junglewise.ai/threats/cve-2026-121737-when-a-remote-unauthenticated-http-1-1-client-pipelined-the) (info, published 11 Nov 2026)
- [CVE-2026-119237: Meta proxygen HTTP/3 denial of service in QPACK handling](https://junglewise.ai/threats/cve-2026-119237-in-proxygen-s-http-3-session-when-a-headers-block-referenced) (info, published 11 Nov 2026)
- [CVE-2026-119235: proxygen QPACK decoder unbounded buffering denial of service](https://junglewise.ai/threats/cve-2026-119235-proxygen-s-qpack-decoder-enforced-its-size-limit-on-a-string) (info, published 11 Nov 2026)
- [CVE-2026-119233: Meta proxygen HTTP/3 denial of service in frame buffering](https://junglewise.ai/threats/cve-2026-119233-proxygen-s-http-3-codec-buffered-an-incomplete-non-data-frame) (info, published 11 Nov 2026)
- [CVE-2026-91096: Meta proxygen use-after-free in stream cleanup](https://junglewise.ai/threats/cve-2026-91096-in-proxygen-from-v2024-10-28-00-until-v2026-09-28-00) (info, published 28 Sep 2026)
- [CVE-2026-91095: Meta proxygen use-after-free in WebTransport stream handling](https://junglewise.ai/threats/cve-2026-91095-in-proxygen-from-v2024-10-28-00-until-v2026-09-28-00-the) (info, published 28 Sep 2026)

## Most severe Meta Proxygen vulnerabilities

- [CVE-2026-121737: Meta proxygen use-after-free in HTTP session handling](https://junglewise.ai/threats/cve-2026-121737-when-a-remote-unauthenticated-http-1-1-client-pipelined-the) (info, published 11 Nov 2026)
- [CVE-2026-119237: Meta proxygen HTTP/3 denial of service in QPACK handling](https://junglewise.ai/threats/cve-2026-119237-in-proxygen-s-http-3-session-when-a-headers-block-referenced) (info, published 11 Nov 2026)
- [CVE-2026-119235: proxygen QPACK decoder unbounded buffering denial of service](https://junglewise.ai/threats/cve-2026-119235-proxygen-s-qpack-decoder-enforced-its-size-limit-on-a-string) (info, published 11 Nov 2026)
- [CVE-2026-119233: Meta proxygen HTTP/3 denial of service in frame buffering](https://junglewise.ai/threats/cve-2026-119233-proxygen-s-http-3-codec-buffered-an-incomplete-non-data-frame) (info, published 11 Nov 2026)
- [CVE-2026-91096: Meta proxygen use-after-free in stream cleanup](https://junglewise.ai/threats/cve-2026-91096-in-proxygen-from-v2024-10-28-00-until-v2026-09-28-00) (info, published 28 Sep 2026)
- [CVE-2026-91095: Meta proxygen use-after-free in WebTransport stream handling](https://junglewise.ai/threats/cve-2026-91095-in-proxygen-from-v2024-10-28-00-until-v2026-09-28-00-the) (info, published 28 Sep 2026)

## Vulnerabilities per week

Nothing in the last four weeks, down from 2 vulnerabilities in the four before.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 2 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 4 | 0 | 0 |

## Other Meta technologies

- [Meta React Server Components (Parcel)](https://junglewise.ai/threats/technologies/react-server-components-parcel): 11 vulnerabilities
- [Meta React Server Components (Turbopack)](https://junglewise.ai/threats/technologies/react-server-components-turbopack): 11 vulnerabilities
- [Meta React Server Components (Webpack)](https://junglewise.ai/threats/technologies/react-server-components-webpack): 11 vulnerabilities
- [Meta Hermes](https://junglewise.ai/threats/technologies/hermes): 4 vulnerabilities
- [Meta WhatsApp for iOS](https://junglewise.ai/threats/technologies/whatsapp-for-ios): 3 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Meta Proxygen vulnerabilities", https://junglewise.ai/threats/technologies/meta-proxygen, 13 November 2026.