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CVE-2026-111124CFITSIO through 4.7.0 Heap Out-of-Bounds Read via Negative ZDITHER0 Seed
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.
6.9 MEDIUMEPSS 0.23%Not in KEVNVD: Modified
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.9 | MEDIUM | 4.0VulnCheck (CNA) | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N |
| 7.1 | HIGH | 3.1NVD | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H |
| 6.1 | MEDIUM | 3.1VulnCheck (CNA) | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H |
Details
- CVE ID
- CVE-2026-111124
- Status
- Modified
- Assigner (CNA)
- VulnCheck
- Published
- Oct 15, 2026
- Last modified
- 2026-10-26 16:17 UTC
- Weaknesses
- CWE-125 · Out-of-bounds Read
Affected Products
As published by the CNA in the CVE record.
HEASARCcfitsio1 version range
- through 4.7.0
References
- github.com https://github.com/HEASARC/cfitsio
- github.com https://github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/imcompress.c#L5353-L5362
- github.com https://github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/imcompress.c#L7495-L7516
- hackmd.io https://hackmd.io/@haind-pwn/cfitsio-zdither0-dither-seed-oob-read
- vulncheck.com https://www.vulncheck.com/advisories/cfitsio-through-4.7.0-heap-out-of-bounds-read-via-negative-zdither0-seed