Bug 2563648 (CVE-2026-118781)

Summary:	CVE-2026-118781 node-forge: node-forge: Denial of Service via infinite loop on negative input
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	abarbaro, alizardo, amctagga, aoconnor, bbrownin, bniver, cdrage, csuconic, dbruscin, dhanak, doconnor, drosa, dschmidt, dsimansk, flucifre, fmariani, gmalinko, gmeno, groman, gtully, ikhan, janstey, jchui, jhe, jlanda, jsherman, jwon, kaycoth, kingland, kshier, ktsao, kvanderr, lchilton, mbenjamin, mcarlett, mhackett, mnovotny, nboldt, oaljalju, pdelbell, pjindal, psrna, rbobbitt, rgemmell, rgodfrey, rhel-process-autobot, rstepani, rushinde, sausingh, sfeifer, simaishi, sostapov, stcannon, tbish, tcunning, tlavocat, vereddy, watson-tool-maintainers, yfang, yguenane
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in node-forge. The bundled mathematical library enters an infinite loop when calculating a modular inverse with a negative value or modulus. If an application allows an attacker to supply untrusted parameters, such as a negative RSA public exponent during cryptographic key generation, the operation can consume excessive CPU resources and block the application event loop, resulting in a Denial of Service (DoS).	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2026-10-29 19:18:08 UTC

Forge (also called node-forge) is a native implementation of Transport Layer Security in JavaScript. Prior to 1.4.1, the affected implementation used BigInteger.prototype.modInverse(), bnModInverse(), lib/jsbn.js, RSA public exponent e to process the relevant input or security decision. node-forge's bundled jsbn implementation entered an infinite loop when BigInteger.prototype.modInverse() received a negative value or modulus. An attacker who could control the RSA public exponent passed to key generation, or a direct modInverse() operand, could block the Node.js event loop at full CPU. Parsed DER, PEM, JWK, PKCS#12, X.509, and TLS values are unsigned and cannot trigger this issue. This issue is fixed in version 1.4.1.