CVE-2026-34734 Vulnerability Analysis & Exploit Details

CVE-2026-34734
Vulnerability Scoring

7.8
/10
Very High Risk

Highly exploitable, CVE-2026-34734 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: Required
    User interaction is necessary for successful exploitation.

CVE-2026-34734 Details

Status: Analyzed

Last updated: 🕗 14 Apr 2026, 20:09 UTC
Originally published on: 🕗 09 Apr 2026, 20:16 UTC

Time between publication and last update: 4 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2026-34734 Vulnerability Summary

CVE-2026-34734: HDF5 is software for managing data. In 1.14.1-2 and earlier, a heap-use-after-free was found in the h5dump helper utility. An attacker who can supply a malicious h5 file can trigger a heap use-after-free. The freed object is referenced in a memmove call from H5T__conv_struct. The original object was allocated by H5D__typeinfo_init_phase3 and freed by H5D__typeinfo_term.

Assessing the Risk of CVE-2026-34734

Access Complexity Graph

The exploitability of CVE-2026-34734 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-34734

With low attack complexity and no required privileges, CVE-2026-34734 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-34734, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-34734, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-34734 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2026-34734 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2026-34734 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-34734 References

External References

CWE Common Weakness Enumeration

CWE-416

Vulnerable Configurations

  • cpe:2.3:a:hdfgroup:hdf5:-:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:-:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.4.3:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.4.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.4.4:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.4.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.4.5:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.4.5:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.2:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.3:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.4:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.5:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.5:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.6:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.6:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.7:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.7:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.8:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.8:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.9:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.9:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.6.10:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.6.10:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.2:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.3:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.4:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.5:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.5:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.6:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.6:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.7:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.7:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.8:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.8:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.9:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.9:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.10:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.10:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.11:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.11:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.12:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.12:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.13:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.13:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.14:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.14:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.15:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.15:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.16:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.16:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.17:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.17:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.18:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.18:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.19:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.19:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.8.20:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.8.20:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.10.1:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.10.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.10.2:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.10.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.10.3:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.10.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.10.4:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.10.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.12.1:-:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.12.1:-:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.12.1:rc1:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.12.1:rc1:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.12.2:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.12.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.12.2-3:rc1:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.12.2-3:rc1:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.0:-:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.0:-:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc3:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc3:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc4:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc4:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc5:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc5:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc6:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.0:rc6:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.1:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.1-1:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.1-1:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.2:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.13.3:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.13.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.14.0:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hdfgroup:hdf5:1.14.1:*:*:*:*:*:*:*
    cpe:2.3:a:hdfgroup:hdf5:1.14.1:*:*:*:*:*:*:*

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