Bug 2429741 (CVE-2026-22036)

Summary: CVE-2026-22036 undici: Undici: Denial of Service via excessive decompression steps
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: aazores, abarbaro, alcohan, alizardo, anjoseph, asoldano, bbaranow, bmaxwell, brian.stansberry, bstansbe, cmah, darran.lofthouse, dlofthou, dosoudil, eaguilar, ebaron, gparvin, istudens, ivassile, iweiss, jbalunas, jchui, jhe, jkoehler, jolong, jprabhak, ktsao, lphiri, manissin, mosmerov, msvehla, nboldt, nwallace, oaljalju, owatkins, pahickey, pberan, pesilva, pjindal, pmackay, psrna, rhaigner, rhel-process-autobot, rstancel, sdawley, smaestri, thjenkin, tom.jenkinson, vdosoudi, watson-tool-maintainers, wtam
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in Undici, an HTTP/1.1 client for Node.js. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP response with an unbounded number of links in the decompression chain. This could lead to high CPU usage and excessive memory allocation, resulting in a Denial of Service (DoS) for the affected system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2430293, 2430294, 2430295, 2430296, 2430297, 2430298, 2430299, 2430300    
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Description OSIDB Bzimport 2026-01-14 20:01:29 UTC
Undici is an HTTP/1.1 client for Node.js. Prior to 7.18.0 and 6.23.0, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation. This vulnerability is fixed in 7.18.0 and 6.23.0.