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CVE-2026-23863 is an attachment spoofing vulnerability in WhatsApp for Windows prior to version 2.3000.1032164386.258709. The flaw arises from improper handling of filenames containing embedded NUL bytes, causing inconsistent interpretation between the application’s higher-level UI logic and the underlying Windows/native file handling layer. A specially crafted attachment can be presented in WhatsApp as a benign document or image based on the visible suffix after the embedded NUL character, while the operating system interprets the filename only up to the NUL byte and treats the file as an executable when the user opens it. This can mislead a user into launching attacker-supplied code under the guise of a harmless attachment.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Null byte injection / attachment spoofing vulnerability in WhatsApp Desktop for Windows that can cause a malicious executable to be displayed as a benign document in the UI but executed as an .exe when opened due to differing interpretation of NUL bytes between JavaScript/Electron and Windows native APIs.
A medium-severity WhatsApp vulnerability affecting Windows that could let a maliciously crafted file with hidden NUL bytes appear as a benign file type while executing as an executable when opened.
A WhatsApp for Windows vulnerability involving improper handling of filenames with embedded null bytes, allowing executable files to be spoofed as benign documents and increasing the risk of social engineering and malware delivery.
An attachment spoofing vulnerability in WhatsApp for Windows caused by improper handling of filenames containing embedded NUL bytes, enabling filename interpretation issues that require a single user click to exploit.
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.