Bug 2528258 (CVE-2026-77465)

Summary: CVE-2026-77465 toml-node: toml-node: Denial of Service via uncontrolled recursion in TOML parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in toml-node. A remote, unauthenticated attacker can exploit an uncontrolled recursion vulnerability in the TOML parser by crafting a malicious TOML document with deeply nested arrays or inline tables. This can lead to the exhaustion of the Node.js call stack, causing a RangeError and terminating the application process, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-09-03 20:42:33 UTC 
toml-node is a TOML parser for Node.js and the browser. Prior to 4.2.0, toml.parse() uses a Peggy 5.1.0 generated recursive-descent parser in lib/parser.js whose peg$parsevalue, peg$parsearray, and peg$parseinline_table_entry functions recurse through nested arrays and inline tables without a depth limit. A remote unauthenticated application parsing an attacker-controlled TOML document containing a few thousand nested arrays or inline tables can exhaust the Node.js call stack, raise an unexpected RangeError rather than the parser's SyntaxError, and terminate an unprotected request worker or process. The corresponding grammar source is src/toml.pegjs, where the generated parser must be bounded. This issue is fixed in version 4.2.0.