Bug 2553758 (CVE-2026-111124)

Summary: CVE-2026-111124 cfitsio: cfitsio: Denial of Service via out-of-bounds read during image decompression
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bbrownin, rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in cfitsio. An attacker could exploit this vulnerability by supplying a specially crafted Flexible Image Transport System (FITS) file containing compressed image data with invalid dither parameters. When processed by an application using the library, this flaw triggers an out-of-bounds heap read that can cause the application to crash, resulting in a Denial of Service (DoS), or potentially lead to unauthorized information disclosure by leaking heap memory.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-15 19:34:15 UTC 
CFITSIO through 4.7.0 contains a heap-based out-of-bounds read vulnerability in the imcompress.c unquantize helpers that allows attackers to read memory before the fits_rand_value table via a zero or negative ZDITHER0 seed. Attackers can supply a crafted FITS file with a SUBTRACTIVE_DITHER_1 compressed image, read through fits_open_file() and fits_read_pix(), to cause crashes or leak heap contents in decoded pixels.