Bug 2553694 (CVE-2026-111125)

Summary: CVE-2026-111125 cfitsio: cfitsio: Denial of Service via heap-based out-of-bounds read in HCOMPRESS tile decoder
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. A heap-based out-of-bounds read vulnerability in the HCOMPRESS tile decompression logic allows an attacker who tricks a user or system into processing a crafted Flexible Image Transport System (FITS) file with oversized tile dimensions to read beyond allocated memory boundaries. This issue primarily leads to a Denial of Service (DoS) through an application crash and may also result in limited information disclosure from heap memory.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2554112, 2554114, 2554115, 2554116, 2554119    
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Description OSIDB Bzimport 2026-10-15 19:05:25 UTC 
CFITSIO through 4.7.0 contains a heap-based out-of-bounds read vulnerability in the HCOMPRESS tile decoder that allows attackers to read past the compressed tile buffer via input_nnybble in fits_hdecompress.c. Attackers can supply a crafted FITS file with ZCMPTYPE HCOMPRESS_1 declaring oversized tile geometry to crash applications calling fits_read_pix or disclose limited heap memory.