7.5

CVE-2023-26964: hyper h2

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2023-26964DEBIAN-CVE-2023-26964openSUSE-SU-2024:12861-1
Published 11-04-2023Last modified 11-02-2025
Open JSON

Vulnerability summary

CVE-2023-26964 is a high (CVSS 7.5) vulnerability in hyper h2. EPSS estimates a 1.12% chance of exploitation in the next 30 days, higher than 65.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.12%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 6 · Related 6
OPENSUSE-SU-2024:0294-1SUSE-SU-2023:2603-1SUSE-SU-2025:02809-1SUSE-SU-2025:02810-1SUSE-SU-2025:02811-1SUSE-SU-2026:3022-1

Timeline

  1. 11-04-2023
    PublishedVulnerability first disclosed.
  2. 11-02-2025
    Last modifiedVulnerability information updated.

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).

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

1.12%

Chance of exploitation in the next 30 days

Percentile

66%

Versus all other CVEs

30-day change

0.00 pp

From 1.12% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.12%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Hyper

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Opensuse6 products
  • hoard&distro=openSUSE Tumbleweed< v.1.4.2~0-1.1
  • pijul&distro=openSUSE Tumbleweed< 1.0.0~beta.5-1.1
  • rustup&distro=openSUSE Tumbleweed< 1.25.2~0-4.1
  • sccache&distro=openSUSE Tumbleweed< 0.4.1~18-2.1
  • wasm-pack&distro=openSUSE Tumbleweed< 0.11.0~0-2.1
Hyper2 products
Crates.Io1 product
  • h2< 0.3.17 | ≥ 0.0.0-0, < 0.3.17
Debian1 product
  • rust-h2< 0.3.13-2
Ubuntu1 product
  • rust-hyperAll versions (No fix recorded)

5 vendors · 11 products

References

13 links
Show all 13 references