CVE-2023-34795: xlsxio v0.1.2 to v0.2.34 was discovered to contain a free of uninitialized pointer in the xlsxioread_sheetlist

This month

HIGH 7.8UPGRADE

CVE-2023-34795 is a high-severity flaw (CVSS 7.8) affecting xlsxio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

xlsxio v0.1.2 to v0.2.34 was discovered to contain a free of uninitialized pointer in the xlsxioread_sheetlist_close() function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted XLSX file.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-416
Published	2023-06-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: xlsxio project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-06-16 16:15 UTCPublished CVE record published
2026-06-17 06:04 UTCUpdated Record last modified

xlsxio project xlsxio UPGRADE

Affected: >= 0.1.2 and <= 0.2.34

Fixed in: newer than 0.2.34

Safe to downgrade to: a release before 0.1.2

1. Check installed version

apt-cache policy xlsxio || rpm -q xlsxio || xlsxio --version

2. UPGRADE to newer than 0.2.34 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade xlsxio

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xlsxio

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.1.2 (Debian / Ubuntu)

apt-cache madison xlsxio sudo apt install xlsxio=<VERSION_BEFORE_0.1.2> sudo apt-mark hold xlsxio

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list xlsxio sudo dnf downgrade xlsxio-<VERSION_BEFORE_0.1.2> sudo dnf versionlock add xlsxio

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-34795?

xlsxio: upgrade to newer than 0.2.34. Exact commands for each OS are on this page.

Is CVE-2023-34795 being exploited?

CVE-2023-34795 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-34795 affect?

CVE-2023-34795 affects xlsxio. Severity is high (CVSS 7.8). xlsxio v0.1.2 to v0.2.34 was discovered to contain a free of uninitialized pointer in the xlsxioread_sheetlist_close() function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted XLSX file.

How urgent is CVE-2023-34795?

Priority 40/100. High severity; Public exploit reference

References

← Back to latest CVEs