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TI-2026-80932 Aliases CVE-2026-116723GHSA-64v9-4hfh-jmvh

Stack buffer overflow in FLTK BMP image loader

Priority HIGH 72CWE-121Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-121 and the CVSS impact.

Summary

FLTK through 1.4.5 contains a stack-based buffer overflow in Fl_BMP_Image::load_bmp_() (CWE-121). An oversized colors_used field in a BMP or ICO file overflows the 768-byte colormap array on the stack. An attacker who crafts such a file can corrupt stack memory, causing crashes or potentially code execution.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

FLTK through 1.4.5 contains a stack-based buffer overflow vulnerability in Fl_BMP_Image::load_bmp_() that allows attackers to corrupt stack memory by supplying an oversized BMP colors_used field. Attackers can craft BMP or ICO files with colors_used above 256 to overflow the 768-byte colormap array, causing crashes or potential code execution.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0016 5th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
fltkfltkup to 1.4.5—No fix listedCNA
  • fltk Vendorfltk Affected up to 1.4.5 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for FLTK. Red Hat lists Red Hat Enterprise Linux 7, 8 and 9 as affected, with the plan none available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-116723
  2. 2026-10-27 Affected versions changed · Red Hat
  3. 2026-10-27 CVSS score added · Red Hat
  4. 2026-10-27 Alias added: GHSA-64v9-4hfh-jmvh
  5. 2026-10-27 Priority changed: MEDIUM → LOW
  6. 2026-11-05 CISA SSVC decision points changed
  7. 2026-11-05 Priority changed: LOW → HIGH

References

Patch 1

Advisory 1

Other 3

  • TI-2026-80933 Heap buffer overflow in FLTK BMP image loader via integer overflow CVSS 4.0HIGH 8.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences