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CVE-2026-40468 is an integer overflow vulnerability in GNU gawk affecting versions 5.4.0 and earlier. The flaw is located in the builtin.c source file. A crafted input processed by the vulnerable code can trigger an integer overflow during size or allocation-related calculations, which may result in excessive memory allocation attempts and memory exhaustion on the host system. The condition may also enable overwriting of gawk heap metadata and in-memory objects with attacker-controlled bytes, creating a memory corruption scenario beyond simple denial of service.
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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.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A reported vulnerability affecting GNU gawk software.
An integer overflow vulnerability in GNU gawk's builtin.c file that may cause memory exhaustion and could allow overwriting heap metadata and objects with attacker-controlled bytes.
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.