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CVE-2026-50256 is a stack-based buffer overflow in X.Org X server and Xwayland font alias resolution. The X server allocated font-alias stack buffers using a 256-byte maximum-name constant, whereas libXfont2 permits resolved alias target names of up to 1024 bytes. In affected code paths, including doListFontsAndAliases() and doListFontsWithInfo(), a resolved alias name can be copied into the undersized buffer without adequate bounds validation. Alias names from 257 through 1023 bytes can therefore overwrite adjacent stack memory. Affected releases are xorg-server before 21.1.23 and Xwayland before 24.1.12.
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26 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the Huawei EulerOS_SA-2026-3320 security advisory; no technical flaw details are provided.
A vulnerability addressed by the EulerOS_SA-2026-3395 advisory; no technical flaw details are provided.
A vulnerability fixed in X.Org Server 21.1.23 and xwayland 24.1.12, also noted as addressed in the discussed XLibre release.
A stack-based buffer overflow in the X.Org X server caused by a constant mismatch with libXfont2 during font alias resolution, enabling local attackers to overwrite up to 768 bytes and potentially escalate privileges to root when X.Org runs as root.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.