CVE-2026-111124 CFITSIO through 4.7.0 Heap Out-of-Bounds Read via Negative ZDITHER0 Seed
Attackers can read heap memory or crash applications by supplying crafted FITS files with negative seeds to the CFITSIO library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-111124?
CVE-2026-111124 is a medium-severity memory corruption vulnerability in HEASARC cfitsio, published on 15 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-111124?
It affects 1 product.
Products include Nasa Cfitsio.
How do I fix CVE-2026-111124?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-111124 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111124 exists.
Other vulnerabilities in HEASARC cfitsio
Sources
Also known as AZL-108260, DEBIAN-CVE-2026-111124, ECHO-752d-aa7f-bd9e, GHSA-9mqr-56x7-4gm4, UBUNTU-CVE-2026-111124.