Out-of-bounds Read in Heasarc Cfitsio
CVE-2026-111124
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.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind-pwn/cfitsio-zdither0-dither-seed-oob-read (technical-description)
- github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/imcomp… (technical-description)
- github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/imcomp… (technical-description)
- github.com/HEASARC/cfitsio (product)
- www.vulncheck.com/advisories/cfitsio-through-4.7.0-heap-out-of-bounds-read-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111124?
- CVE-2026-111124 is a medium-severity vulnerability in Heasarc Cfitsio, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-10-15.
- How severe is CVE-2026-111124?
- Medium severity. CVSS v3 base score is 6.1 out of 10.