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Public proof of concept

CVE-2026-111125

CFITSIO through 4.7.0 Heap Out-of-Bounds Read via HCOMPRESS input_nnybble

A public proof of concept exists; no exploitation attested.

  • Published2026-10-15
  • WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-10-1519:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-111125?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-111125?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Nasa cfitsio
BranchAffectedFixed in
4.7≤ 4.7.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-111125 Red Hat Product Security3 known affected

    cfitsio: cfitsio: Denial of Service via heap-based out-of-bounds read in HCOMPRESS tile decoder

    cfitsio-devel as a component of Red Hat Enterprise Linux 10 · cfitsio.src as a component of Red Hat Enterprise Linux 10 · cfitsio.src as a component of Red Hat Enterprise Linux AI (RHEL AI) 3

Full record on NVD

Fix

  1. No fix available, says the vendor Red Hat Product Security CVE-2026-111125 · 3 productsFix deferred

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionpoc2026-10-21
  • OpenCVESSVC decisionpoc—
  • CNACVSS 4.06.9read 2026-10-23
  • CNACVSS 3.16.1read 2026-10-23
  • NVDCVSS 3.17.1read 2026-10-23
  • CNAweakness (CWE)CWE-125read 2026-10-23
  • FIRST EPSSEPSS score0.2 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
CVSS 4.0 vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-10-15
Last Modified
2026-10-21
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-111125?

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.

Is CVE-2026-111125 actively exploited?

A proof-of-concept exploit exists for CVE-2026-111125, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-111125?

CVE-2026-111125 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

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