High severity · published Oct 15, 2026
CVE-2026-111125
CFITSIO through 4.7.0 Heap Out-of-Bounds Read via HCOMPRESS input_nnybble
7.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CF
cfitsio · HEASARC
through 4.7.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111125
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111125
Product
https://github.com/HEASARC/cfitsio
Product
https://github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/fits_hdecompress.c#L2575-L2633
Product
https://github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/imcompress.c#L6310-L6316
Exploit
https://hackmd.io/@haind-pwn/cfitsio-zdither0-dither-seed-oob-read
Third Party Advisory
https://www.vulncheck.com/advisories/cfitsio-through-4.7.0-heap-out-of-bounds-read-via-hcompress-input-nnybble
More from cfitsio
7.8
CVE-2026-115504
CFITSIO through 4.7.0 Out-of-Bounds Write via ffgcls2 in getcols.c
7.1
CVE-2026-111124
CFITSIO through 4.7.0 Heap Out-of-Bounds Read via Negative ZDITHER0 Seed