High severity · published Oct 26, 2026
CVE-2026-116724
FLTK through 1.4.5 Heap Buffer Overflow via Fl_BMP_Image Integer Overflow
New
7.8
CVSS
0.1%
EPSS
No
On KEV
Description
FLTK through 1.4.5 contains an integer overflow vulnerability in Fl_BMP_Image::load_bmp_() that causes undersized pixel buffer allocation from file-supplied width and height. Attackers can supply a crafted BMP or ICO file with large dimensions so row decoding writes file-derived data past the heap buffer, corrupting the application heap.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
fltk · fltk
through 1.4.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116724
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116724
github.com
https://github.com/fltk/fltk
github.com
https://github.com/fltk/fltk/blob/release-1.4.5/src/Fl_BMP_Image.cxx#L281-L286
github.com
https://github.com/fltk/fltk/commit/3a049d8262dc759cf9737339420e8457e24c0cb1
github.com
https://github.com/fltk/fltk/issues/1632
hackmd.io
https://hackmd.io/@haindpwn/fltk-bmp-image-stack-heap-overflow
www.vulncheck.com
https://www.vulncheck.com/advisories/fltk-through-1.4.5-heap-buffer-overflow-via-fl-bmp-image-integer-overflow
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