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TI-2023-10308 Aliases CVE-2023-24808

Denial Of Service when opening a corrupt PDF file in pdfio

Priority HIGH 68CWE-835Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-835.

Summary

PDFio is a C library for reading and writing PDF files. In versions prior to 1.1.0 a denial of service (DOS) vulnerability exists in the pdfio parser. Crafted pdf files can cause the program to run at 100% utilization and never terminate. The pdf which causes this crash found in testing is about 28kb in size and was discovered via fuzzing. Anyone who uses this library either as a standalone binary or as a library can be DOSed when attempting to parse this type of file. Web servers or other automated processes which rely on this code to turn pdf submissions into plaintext can be DOSed when an attacker uploads the pdf. Please see the linked GHSA for an example pdf. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00719 54th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed pdfio (michaelrsweet): 1.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
michaelrsweetpdfiobefore 1.1.01.1.0Patch availableCNA
  • pdfio Vendormichaelrsweet Affected before 1.1.0 Fixed in 1.1.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:pdfio_project:pdfio:*:*:*:*:*:*:*:*before 1.1.0VulnerablePdfio Project
  • cpe:2.3:a:pdfio_project:pdfio:*:*:*:*:*:*:*:* Versions before 1.1.0 Vulnerable ·Pdfio Project

Remediation

  • Fix · CNA pdfio (michaelrsweet) Fixed in 1.1.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-24808

References

Exploit 1

Patch 1

  • TI-2026-76283 Use after free in michaelrsweet mxml mxml_load_data CVSS 4.0MEDIUM 5.1
  • TI-2026-74098 Off-by-one stack out-of-bounds write in Mini-XML mxml_strtod() CVSS 4.0LOW 2.0
  • TI-2026-53919 PDFio < 1.6.5 Dangling Pointer via Dictionary String-Formatting CVSS 4.0HIGH 7.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences