CVE-2026-115504

CFITSIO through 4.7.0 Out-of-Bounds Write via ffgcls2 in getcols.c

HIGH 8.5EPSS 0.1%

CFITSIO through 4.7.0 contains an out-of-bounds write vulnerability in ffgcls2() in getcols.c that trusts attacker-controlled heap descriptor lengths for variable-length string columns. Attackers can supply a crafted FITS file that overflows a fixed 28,800-byte stack buffer and the caller's string array, enabling arbitrary code execution.

Affected: HEASARC · cfitsio
CVSS v4.0 VULNCHECK: 8.5 HIGHCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/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
CVSS v3.1 VULNCHECK: 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS: 0.13% chance of exploitation in the next 30 days, 3rd percentile
Published: 2026-10-22
Updated: 2026-10-29

Proof-of-concept exploits (1)

https://gist.github.com/yure1432/98f15c7e8f48dc90ae65646f926aa176snapshot

CVE references

HEASARC/cfitsioREFERENCE
HEASARC/cfitsio/commit/579792e0f85bff0c6733ad5ebdf54c3b5c188686REFERENCE
HEASARC/cfitsio/pull/184REFERENCE
https://www.vulncheck.com/advisories/cfitsio-through-4.7.0-out-of-bounds-write-via-ffgcls…REFERENCE

CVE-2026-115504

Proof-of-concept exploits (1)

CVE references

References