CVE-2026-111124: CFITSIO through 4.7.0 contains a heap-based out-of-bounds read vulnerability in the imcompress.c unquantize he

Q: How do I fix CVE-2026-111124?

cfitsio: upgrade to newer than 4.7.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-111124 being exploited?

CVE-2026-111124 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-111124 affect?

CVE-2026-111124 affects cfitsio. Severity is medium (CVSS 6.1). 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 su

Q: How urgent is CVE-2026-111124?

Priority 30/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2026-111124 is a medium-severity flaw (CVSS 6.1) affecting cfitsio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-10-15
Last modified	2026-10-26

Publisher (CNA): VulnCheck · Vendor: nasa

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-15 19:17 UTCPublished CVE record published
2026-10-26 16:17 UTCUpdated Record last modified

nasa cfitsio UPGRADE

Affected: <= 4.7.0

Fixed in: newer than 4.7.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cfitsio || rpm -q cfitsio || cfitsio --version

2. UPGRADE to newer than 4.7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cfitsio

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cfitsio

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-111124?

cfitsio: upgrade to newer than 4.7.0. Exact commands for each OS are on this page.

Is CVE-2026-111124 being exploited?

CVE-2026-111124 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-111124 affect?

CVE-2026-111124 affects cfitsio. Severity is medium (CVSS 6.1). 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 su

How urgent is CVE-2026-111124?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2026-111125 MEDIUM 6.1 UPGRADE CFITSIO through 4.7.0 contains a heap-based out-of-bounds read vulnerability in the HCOMPRESS tile decoder tha

References

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