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CVE-2026-53910 affects the diff3 tool in GNU diffutils versions through 3.12. Multiple signed integer overflows in line-mapping calculations can corrupt memory allocation sizes and loop bounds. Processing crafted output from a diff backend can consequently cause insufficient heap allocation followed by out-of-bounds writes. An attacker must control the diff output consumed by diff3, for example by supplying a malicious backend through the --diff-program option. A crash has been demonstrated; potential remote code execution is claimed but disputed by the maintainers, who consider the issue a bug rather than a security vulnerability.
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No public exploit code observed for this vulnerability.
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5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A locally exploitable vulnerability with low attack complexity that can affect availability; the CVSS v3 vector requires low privileges and indicates high availability impact.
An integer overflow vulnerability affecting GNU diffutils software.
A heap-based buffer overflow in the diff3 tool from GNU diffutils caused by multiple signed integer overflows in line-mapping calculations, which can lead to insufficient memory allocation, out-of-bounds writes, crashes, and potentially remote code execution.
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.