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CVE-2026-34622 is a prototype pollution vulnerability in Adobe Acrobat Reader that affects versions 26.001.21411, 24.001.30360, 24.001.30362, and earlier on Windows and macOS. The flaw is classified as CWE-1321, Improperly Controlled Modification of Object Prototype Attributes. Available technical reporting indicates the issue is associated with the JavaScript-facing function ANFancyAlertImpl, which constructed executable code from attacker-controlled object keys and passed the resulting string to eval(). By polluting object prototype attributes and influencing the buttons object processed by this routine, an attacker can inject and execute arbitrary JavaScript within Acrobat Reader. Adobe states that successful exploitation can result in arbitrary code execution in the context of the current user and requires the victim to open a malicious file.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a small, self-contained research PoC for an Adobe Acrobat exploit chain centered on malicious PDF JavaScript execution and post-exploitation file theft. It contains 4 files: a Python PDF generator (CVE-2026-34621.py), a Python HTTP collection server (c2.py), the main Acrobat JavaScript payload (payload_steal.js), and documentation (ReadMe.md). The main exploit flow is: the operator embeds payload_steal.js into a PDF using CVE-2026-34621.py; the generated PDF sets /OpenAction to a JavaScript action so code runs when the document is opened; the JavaScript then abuses Acrobat-specific internal functions and trust mechanisms to obtain privileged execution; finally it reads a local Windows file and exfiltrates it over HTTP in chunks. CVE-2026-34621.py is not itself the vulnerability trigger beyond embedding arbitrary JavaScript into a PDF. It is a helper utility that reads an external JS file, escapes it for PDF syntax, and writes a minimal PDF object structure with /OpenAction pointing to a /JavaScript action. This makes it the delivery builder for the exploit document. payload_steal.js contains the actual exploit logic. It defines a privileged file-stealing routine using app.beginPriv(), util.readFileIntoStream(), and app.launchURL(). It hardcodes the victim file path /C/Windows/System32/drivers/etc/hosts and exfiltrates the resulting hex data to http://192.168.56.1:45191/exfil. The script also contains the exploit chain primitives described in the README: injection through ANFancyAlertImpl with a crafted button key, prototype pollution using Object.prototype.__defineGetter__('swConn', ...), trusted function registration via app.trustedFunction.bind, fake object methods for path processing, and invocation of ANShareFile/SilentDocCenterLogin to redirect privileged workflow execution. c2.py is a simple operational support component rather than the exploit itself. It listens on 0.0.0.0:45191, accepts GET requests to /exfil, reconstructs chunked hex data into binary, and saves recovered files under exfiltrated_files/. It prints progress and validates whether the recovered file begins with a PDF header. Overall, this is a real exploit PoC repository rather than a detector. It demonstrates a file-based attack vector against vulnerable Adobe Acrobat Reader environments, with a hardcoded but functional payload and a matching receiver, making it operational rather than a bare conceptual proof.
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18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Уязвимость в Adobe Acrobat/Reader, также связанная с prototype pollution, где управление ключами объекта позволяло инжектировать JavaScript через eval(), что приводило к arbitrary code execution.
A likely CVE assignment for a use-after-free remote code execution vulnerability in Adobe Acrobat Reader's Escript.api module caused by improper handling of property accessor definitions and desynchronization between reference counting and the event scope stack.
A prototype pollution-related Adobe Acrobat/Reader vulnerability addressed in the second emergency update. The analysis links it to a security fix involving unsafe handler construction in ANFancyAlertImpl or related variants, but states the exact CVE-to-patch mapping is unclear.
A critical prototype pollution vulnerability in Adobe Acrobat and Reader that can allow arbitrary code execution in the context of the current user.
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Cross-references every affected SKU, including bundled OEM variants.
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