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
Published Dec 4, 2019
9.8
CRITICALCVSS 3.1
EPSS 1.36%
Description
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.
Affected products
-
- Version v0.29.0StatusaffectedConstraints<unspecified
- Version v2017.04.03.00StatusaffectedConstraints-
- Version unspecifiedStatusunaffectedConstraints<v0.29.0
- Version
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.36% (0.01364) | 70.84th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.36% (0.01364) | 70.56th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.24% (0.00235) | 62.08th | v3 (v2023.03.01) |
| Jun 14, 2024 | 0.24% (0.00235) | 61.82th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.24% (0.00235) | 59.82th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 9.03% (0.09029) | 86.86th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.74% (0.02742) | 63.06th | v1 |
| Jan 6, 2022 | 2.74% (0.02742) | 62.72th | v1 |
| Jan 5, 2022 | 0.62% (0.00624) | 46.35th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
References (2)
- https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f x_refsource_MISCPatchThird Party Advisory
- https://www.facebook.com/security/advisories/cve-2019-11940 x_refsource_CONFIRMThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f | x_refsource_MISCPatchThird Party Advisory | |
| https://www.facebook.com/security/advisories/cve-2019-11940 | x_refsource_CONFIRMThird Party Advisory |
Change history (0)
No recorded changes yet.