Bug 2436942 (CVE-2026-25547)

Summary: CVE-2026-25547 brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aazores, abrianik, abuckta, akostadi, alcohan, amasferr, aschwart, asoldano, ataylor, bbaranow, bdettelb, bmaxwell, boliveir, brian.stansberry, bsmejkal, caswilli, chfoley, cmah, darran.lofthouse, dbruscin, dfreiber, dhanak, dkuc, dmayorov, doconnor, dosoudil, drosa, drow, dschmidt, eaguilar, ebaron, erezende, eric.wittmann, fjuma, ggrzybek, gmalinko, gparvin, ibek, istudens, ivassile, iweiss, jachapma, janstey, jbalunas, jburrell, jcantril, jlledo, jolong, jrokos, jscholz, kaycoth, kshier, kvanderr, kverlaen, lchilton, manissin, mattdavi, mnovotny, mosmerov, mposolda, mstipich, msvehla, nipatil, nwallace, orabin, pahickey, pantinor, parichar, pberan, pbizzarr, pdelbell, pesilva, pjindal, pmackay, progier, rexwhite, rhaigner, rjohnson, rkubis, rmartinc, rojacob, rstancel, rstepani, sausingh, sfeifer, smaestri, smcdonal, snegrini, spichugi, ssidhaye, ssilvert, stcannon, sthirugn, sthorger, swoodman, tasato, tbordaz, teagle, tom.jenkinson, tsedmik, vashirov, vkumar, vmuzikar, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the brace-expansion component. This denial of service (DoS) vulnerability allows a remote attacker to provide specially crafted input containing repeated numeric brace ranges. This input causes the library to attempt an unbounded expansion, consuming excessive CPU and memory resources. This can lead to a system crash, impacting the availability of the service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-02-04 22:01:35 UTC 
@isaacs/brace-expansion is a hybrid CJS/ESM TypeScript fork of brace-expansion. Prior to version 5.0.1, @isaacs/brace-expansion is vulnerable to a denial of service (DoS) issue caused by unbounded brace range expansion. When an attacker provides a pattern containing repeated numeric brace ranges, the library attempts to eagerly generate every possible combination synchronously. Because the expansion grows exponentially, even a small input can consume excessive CPU and memory and may crash the Node.js process. This issue has been patched in version 5.0.1.