CVE-2023-34795Public exploit

Process crash via uninitialized parser pointer free

Published Jun 16, 2023 · Updated Dec 17, 2024

Uninitialized-pointer free in xlsxio 0.1.2 through 0.2.34 allows attackers to crash a consuming process via a malformed XLSX file. The xlsxioread_sheetlist_open() failure path returns a sheet-list object without initializing xmlparser, so xlsxioread_sheetlist_close() passes an indeterminate pointer to XML_ParserFree(). The call sequence requires a consuming application to list sheets from an attacker-controlled workbook and close the returned handle, producing a process crash.

CVSS severityUnavailable
Unscored
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uninitialized-pointer free in xlsxio 0.1.2 through 0.2.34 allows attackers to crash a consuming process via a malformed XLSX file. The xlsxioread_sheetlist_open() failure path returns a sheet-list object without initializing xmlparser, so xlsxioread_sheetlist_close() passes an indeterminate pointer to XML_ParserFree(). The call sequence requires a consuming application to list sheets from an attacker-controlled workbook and close the returned handle, producing a process crash.

The record

CVE
CVE-2023-34795
Published
Jun 16, 2023
Updated
Dec 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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