A 32-bit unsigned integer overflow in the XWD (X Windows) encoder can cause an undersized heap buffer allocation. When writing a extremely large image an out of bounds heap write can occur.
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==741961==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x5020000083dc at pc 0x56553b4c4245 bp 0x7ffd9d20fef0 sp 0x7ffd9d20fee0
WRITE of size 1 at 0x5020000083dc thread T0
{
"nvd_published_at": "2026-03-10T07:44:57Z",
"github_reviewed_at": "2026-03-12T14:16:51Z",
"github_reviewed": true,
"severity": "MODERATE",
"cwe_ids": [
"CWE-122"
]
}