UNKNOWN READ vulnerability in ghostscript: insert_free_size

ghostscript Updated 02 Oct 2025

Summary

25/12/2021

Disclosed on

MEDIUM

Severity

Yes i

Fix available

Medium

Severity

Not published

CVSS Score

OSV-2021-1754: UNKNOWN READ in insert_free_size. Affects ghostscript versions >= 75fbddf52051987287e62d13c659eb73ba16982f, < 2c954310adc5753565a30dfe1b080f6a97ed4b4c. Fixed in 2c954310adc5753565a30dfe1b080f6a97ed4b4c. How to fix ↓

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Background

Ghostscript is an open-source interpreter for the PostScript language and the PDF file format. It is widely used for rendering and converting documents. The vulnerability, identified as OSV-2021-1754, affects the ghostscript package. Ghostscript's insert_free_size function is susceptible to an UNKNOWN READ vulnerability, which can lead to a crash. This vulnerability was reported through the OSS-Fuzz project.

Vulnerability Detail

The UNKNOWN READ vulnerability in ghostscript's insert_free_size function can result in a crash. The exact cause of the vulnerability is not specified in the provided information. However, the crash state indicates that the issue occurs during the execution of chunk_free_object and pdfi_pscript_stack_finit functions. The impact and potential ramifications of this vulnerability are not explicitly mentioned.

How To Fix

Minimum fixed version

2c954310adc5753565a30dfe1b080f6a97ed4b4c

This is the first release that contains the fix.

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Workaround

No specific workaround is mentioned in the provided information.

Conclusion

The UNKNOWN READ vulnerability in ghostscript's insert_free_size function can lead to a crash. It is recommended to update the ghostscript package to a version that includes the fix. For further support on vulnerability remediation, you can contact DevNack.com.

See every vulnerability recorded for ghostscript →