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CVE-2023-26964

25
FAUCET Score

CVE-2023-26964 describes a Denial of Service (DoS) vulnerability in hyper v0.13.7 and h2-0.2.4, where processing HTTP/2 RST_STREAM frames can lead to excessive memory and CPU consumption. This vulnerability has a CVSS score of 7.5 (High), indicating it can be exploited remotely with low attack complexity and no user interaction, resulting in high availability impact. There is currently no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
0.2.4CPE matchmatch criteria
cpe:2.3:a:hyper:h2:0.2.4:*:*:*:*:rust:*:*
0.13.7CPE matchmatch criteria
cpe:2.3:a:hyper:hyper:0.13.7:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.12%
Probability of exploitation in next 30 days
EPSS Percentile
62.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0112 is in the 41st percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (25)

microsoftpatch availablevia msrc
Product: Azure Linux 3.0 ARMFixed in: 2024.4-1
microsoftpatch availablevia msrc
Product: cbl2 kata-containers 3.2.0.azl0-1 on CBL Mariner 2.0Fixed in: 3.2.0.azl0-1
microsoftpatch availablevia msrc
Product: cbl2 rpm-ostree 2022.1-7 on CBL Mariner 2.0Fixed in: 2022.1-7
microsoftpatch availablevia msrc
Product: azl3 rust h2-0.3.26 on Azure Linux 3.0Fixed in: h2-0.3.26
microsoftpatch availablevia msrc
Product: azl3 kata-containers 3.2.0.azl0-2 on Azure Linux 3.0Fixed in: 3.2.0.azl0-2
microsoftpatch availablevia msrc
Product: azl3 kata-containers 3.1.3-2 on Azure Linux 3.0Fixed in: 3.2.0.azl0-2
microsoftpatch availablevia msrc
Product: azl3 rpm-ostree 2022.1-7 on Azure Linux 3.0Fixed in: 2024.4-1
microsoftpatch availablevia msrc
Product: azl3 rpm-ostree 2024.4-1 on Azure Linux 3.0Fixed in: 2024.4-1
microsoftpatch availablevia msrc
Product: azl3 rust 1.86.0-1 on Azure Linux 3.0
microsoftpatch availablevia msrc
Product: 18815-17084Fixed in: 2024.4-1
microsoftpatch availablevia msrc
Product: 17811-17084Fixed in: 2024.4-1
microsoftpatch availablevia msrc
Product: 19686-17084
microsoftpatch availablevia msrc
Product: 18368-16823Fixed in: 3.2.0.azl0-1
microsoftpatch availablevia msrc
Product: 18011-16823Fixed in: 2022.1-7
microsoftpatch availablevia msrc
Product: 18369-17084Fixed in: h2-0.3.26
microsoftpatch availablevia msrc
Product: 18370-17084Fixed in: 3.2.0.azl0-2
microsoftpatch availablevia msrc
Product: 19706-17084Fixed in: 3.2.0.azl0-2
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 3.2.0.azl0-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 2022.1-7
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 3.2.0.azl0-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 2022.1-7
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 x64Fixed in: 3.2.0.azl0-2
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 x64Fixed in: 2024.4-1
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 ARMFixed in: 3.2.0.azl0-2
rustpatch availablevia ghsa
Product: h2Fixed in: 0.3.17

Vendor Advisories (3)

microsoft2024-Sep/CVE-2023-26964

CVE-2023-26964

Sep 10, 2024
rustGHSA-f8vr-r385-rh5rmedium

h2 vulnerable to denial of service

Apr 11, 2023
microsoft2023-Apr/CVE-2023-26964Important

An issue was discovered in hyper v0.13.7. h2-0.2.4 Stream stacking occurs when the H2 component processes HTTP2 RST_STREAM frames. As a result the memory and CPU usage are high which can lead to a Denial of Service (DoS).

Apr 11, 2023

References

github.com / hyperium/hyper/issues/2877
ExploitIssue Tracking
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/ZHBAE7LQARMPUEEV4TWET4D7G6WCWBUD
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/ZYRZ5Y2ALATKKPIITAFAJIS4TR4LUAHO