Is CVE-2026-111125 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-111125?

CVE-2026-111125 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2026-111125

Description

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.