CVE-2023-28428: PDFio is a C library for reading and writing PDF files

Q: How do I fix CVE-2023-28428?

pdfio: upgrade to 1.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2023-28428 being exploited?

CVE-2023-28428 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-28428 affect?

CVE-2023-28428 affects pdfio. Severity is medium (CVSS 6.2). PDFio is a C library for reading and writing PDF files. In versions 1.1.0 and prior, a denial of service vulnerability exists in the pdfio parser. Crafted pdf files can cause the program to run at 100% utilization and never terminate. This

Q: How urgent is CVE-2023-28428?

Priority 25/100. No elevated risk signals yet.

Routine

MEDIUM 6.2UPGRADE

CVE-2023-28428 is a medium-severity flaw (CVSS 6.2) affecting pdfio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PDFio is a C library for reading and writing PDF files. In versions 1.1.0 and prior, a denial of service vulnerability exists in the pdfio parser. Crafted pdf files can cause the program to run at 100% utilization and never terminate. This is different from CVE-2023-24808. A patch for this issue is available in version 1.1.1.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.2 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-770
Published	2023-03-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: pdfio project

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

Am I affected?

Timeline

2023-03-20 15:15 UTCPublished CVE record published
2026-06-17 05:47 UTCUpdated Record last modified

pdfio project pdfio UPGRADE

Affected: < 1.1.1

Fixed in: 1.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.1.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pdfio

Note

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

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-2023-28428?

pdfio: upgrade to 1.1.1. Exact commands for each OS are on this page.

Is CVE-2023-28428 being exploited?

CVE-2023-28428 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-2023-28428 affect?

CVE-2023-28428 affects pdfio. Severity is medium (CVSS 6.2). PDFio is a C library for reading and writing PDF files. In versions 1.1.0 and prior, a denial of service vulnerability exists in the pdfio parser. Crafted pdf files can cause the program to run at 100% utilization and never terminate. This

How urgent is CVE-2023-28428?

Priority 25/100. No elevated risk signals yet.

Related CVEs

CVE-2024-42358 MEDIUM 6.2 UPGRADE PDFio is a simple C library for reading and writing PDF files
CVE-2023-24808 MEDIUM 5.3 UPGRADE PDFio is a C library for reading and writing PDF files

References

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