Integer Overflow DoS in Node.js WebCrypto subtle.encrypt()
CVE-2026-48933 is a high-severity vulnerability in the Node.js WebCrypto API affecting the 22.x, 24.x, and 26.x release lines. The flaw is described as an integer overflow in the WebCrypto implementation, specifically triggered when input passed to subtle.encrypt() is a multiple of 2 GiB. The issue has been characterized in reporting as affecting WebCrypto AES operations. When the vulnerable code processes such oversized input, the integer overflow can destabilize the Node.js process and cause it to terminate unexpectedly.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity integer overflow in the Node.js WebCrypto API that can crash a remote process and cause denial of service.
A high-severity Node.js WebCrypto AES integer overflow that can crash the process and enable remote denial-of-service attacks.
The version that knows your environment.
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.