What’s Vulnerable › Vulnerabilities

CVE-2026-111125: CFITSIO through 4.7.0 Heap Out-of-Bounds Read via HCOMPRESS input_nnybble

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-10-15 · updated 2026-10-21
• Weakness: CWE-125

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.

Affected products

• HEASARC cfitsio: through 4.7.0

References

• https://github.com/HEASARC/cfitsio
• https://github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/fits_hdecompress.c#L2575-L2633
• https://github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/imcompress.c#L6310-L6316
• https://hackmd.io/@haind-pwn/cfitsio-zdither0-dither-seed-oob-read
• https://www.vulncheck.com/advisories/cfitsio-through-4.7.0-heap-out-of-bounds-read-via-hcompress-input-nnybble

Get alerted when CVE-2026-111125 or the next vulnerability affects your stack