CVE-2026-111125: heasarc cfitsio Out-of-bounds Read
Vulnerability summary
CVE-2026-111125 is a high (CVSS 7.1) Out-of-bounds Read vulnerability in heasarc cfitsio. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.2% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 15-10-2026PublishedVulnerability first disclosed.
- 21-10-2026Last modifiedVulnerability information updated.
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 metrics
7 scores · 4 sources · 2 versions- NVDNIST6.9MediumCVSS: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
- OSV · UbuntuEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
- CVE.orgCNA6.1MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:HDiffers
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:HDiffers
EPSS trend
Probability
0.13%
Chance of exploitation in the next 30 days
Percentile
2%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (hackmd.io)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian1 product
- cfitsioAll versions (No fix recorded)
Heasarc1 product
- cfitsio≤ 4.7.0
Nasa1 product
- cfitsio≤ 4.7.0
Ubuntu1 product
- cfitsioAll versions (No fix recorded)
4 vendors · 4 products
References
8 links- hackmd.io/@haind-pwn/cfitsio-zdither0-dither-seed-oob-readTechnical DescriptionExploitREPORTMitigationThird Party Advisory
- github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/fits_hdecompress.cTechnical DescriptionREPORTProduct
- github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/imcompress.cTechnical DescriptionREPORTProduct
