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CVE-2026-19118 is a time-of-check to time-of-use (TOCTOU) race condition in GitHub Enterprise Server. An authenticated repository user with write access could precisely coordinate concurrent upload requests to race file handling or access-control checks, potentially bypassing intended controls and obtaining remote code execution. The vulnerability affects GitHub Enterprise Server releases prior to 3.22.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity TOCTOU race condition in GitHub Enterprise Server that allegedly lets an attacker race crafted image-file uploads and replacements to bypass access controls and achieve remote code execution.
An authenticated remote code execution vulnerability in GitHub Enterprise Server caused by a time-of-check time-of-use race condition during concurrent upload requests. Exploitation requires repository write access and precise request timing.
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.