CVE-2026-91186 GUIX PNG Decoder - Buffer Overflow

GUIX PNG chunk reader contains a buffer overflow caused by processing a second IHDR chunk after IDAT, letting attackers cause memory corruption, exploit requires crafted PNG file with multiple IHDR chunks.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/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
Published
20 October 2026
Updated
21 October 2026
Weakness
CWE-125

Vendor fix

Update to the latest version with proper IHDR chunk validation and ordering checks.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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