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CVE-2023-26964

HIGH
7.5
CVSS Score
Published: April 11, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 05:44 AM UTC
2 products affected across 1 vendorHyperH2

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
PoC

Description

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

References (3)

ExploitIssue Tracking
Source: [email protected]
https://github.com/hyperium/hyper/issues/2877
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZHBAE7LQARMPUEEV4TWET4D7G6WCWBUD/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZYRZ5Y2ALATKKPIITAFAJIS4TR4LUAHO/

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-770

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