CVE-2019-11940 json
In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the head…
published 2019-12-04 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3596
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 71%
- public exploits
- 0
- none known
Summary
In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.
Patch / fix
Exploit prediction
1.36% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Facebook Proxygen
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
github.com
/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f
patch, third-party-advisory
-
facebook.com
/security/advisories/cve-2019-11940
third-party-advisory
Sources
- CVE List CVE-2019-11940
- NVD CVE-2019-11940
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.