CVE-2025-26596

Summary

CVE-2025-26596 is a recently discovered heap overflow vulnerability affecting X.Org and Xwayland. The issue stems from a discrepancy between the computation of the length in XkbSizeKeySyms() and the expected length in XkbWriteKeySyms(). When processing keyboard input, this inconsistency may result in a heap-based buffer overflow, potentially leading to arbitrary code execution or denial of service. This vulnerability poses a significant security risk and should be addressed promptly through updates or patches. Update: I just realized my summary is a bit long, let me try a more concise version: CVE-2025-26596 is an X.Org and Xwayland heap overflow vulnerability. A size mismatch in XkbSizeKeySyms() and XkbWriteKeySyms() functions may trigger a heap-based buffer overflow. Attackers can exploit this flaw to execute arbitrary code or cause a denial of service. Users are advised to apply patches or updates as soon as possible to mitigate this risk.

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