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CVE-2026-40467 is a use-after-free vulnerability in GNU Awk (gawk)'s io.c file, specifically the do_getline_redir() routine. It affects gawk versions 5.4.0 and earlier and can cause the application to crash.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
37 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in gawk's io.c that can cause denial of service.
A vulnerability referenced in the Rocky Linux 9.6 local security check; no technical impact details are provided.
A use-after-free vulnerability in gawk's io.c that can cause denial of service on affected Rocky Linux 9 systems.
A vulnerability addressed by the referenced Alma Linux 9.6 TuxCare security advisory; no technical flaw details are provided.
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.