Medium 6.1Published Oct 15, 2026

CVE-2026-111124CFITSIO through 4.7.0 Heap Out-of-Bounds Read via Negative ZDITHER0 Seed

Updated under an hour ago (Oct 28, 2026, 1:10 AM ET)

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It affects HEASARC cfitsio and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for HEASARC cfitsio

Exploited in the last 30 days

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.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Modified
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

HEASARC cfitsio heasarc:cfitsio (from the name)	through 4.7.0	CNA record
nasa cfitsio nasa:cfitsio	through 4.7.0	NVD

References

References

https://hackmd.io/@haind-pwn/cfitsio-zdither0-dither-seed-oob-read	technical-description, exploit, mitigation, vendor-advisory
https://github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/imcompress.c#L5353-L5362	technical-description, product
https://github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/imcompress.c#L7495-L7516	technical-description, product
https://github.com/HEASARC/cfitsio	product
https://www.vulncheck.com/advisories/cfitsio-through-4.7.0-heap-out-of-bounds-read-via-negative-zdither0-seed	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.