Bug 2447140 (CVE-2026-2581)

Summary: CVE-2026-2581 undici: Undici: Denial of Service due to uncontrolled resource consumption
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, abarbaro, alizardo, anpicker, anujha, asoldano, bbaranow, bmaxwell, bparees, brian.stansberry, bstansbe, cmah, darran.lofthouse, dlofthou, dosoudil, dschmidt, eaguilar, ebaron, erezende, fjuma, hasun, istudens, ivassile, iweiss, jchui, jfula, jhe, jkoehler, jlanda, jolong, jowilson, kshier, ktsao, lphiri, mosmerov, msvehla, nboldt, nwallace, nyancey, oaljalju, ometelka, pberan, pesilva, pjindal, pmackay, psrna, ptisnovs, rhel-process-autobot, rstancel, sdawley, simaishi, smaestri, smcdonal, stcannon, syedriko, teagle, thjenkin, tom.jenkinson, vdosoudi, watson-tool-maintainers, xdharmai, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in Undici. When the `interceptors.deduplicate()` feature is enabled, response data for deduplicated requests can accumulate in memory. A remote attacker, by sending large or chunked responses and concurrent identical requests from an untrusted endpoint, can exploit this uncontrolled resource consumption. This leads to high memory usage and potential Out-Of-Memory (OOM) process termination, resulting in a Denial of Service (DoS) for the application.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2447171, 2447173, 2447177, 2447180    
Bug Blocks:    

Description OSIDB Bzimport 2026-03-12 21:01:33 UTC 
This is an uncontrolled resource consumption vulnerability (CWE-400) that can lead to Denial of Service (DoS).

In vulnerable Undici versions, when interceptors.deduplicate() is enabled, response data for deduplicated requests could be accumulated in memory for downstream handlers. An attacker-controlled or untrusted upstream endpoint can exploit this with large/chunked responses and concurrent identical requests, causing high memory usage and potential OOM process termination.

Impacted users are applications that use Undici’s deduplication interceptor against endpoints that may produce large or long-lived response bodies.

PatchesThe issue has been patched by changing deduplication behavior to stream response chunks to downstream handlers as they arrive (instead of full-body accumulation), and by preventing late deduplication when body streaming has already started.

Users should upgrade to the first official Undici (and Node.js, where applicable) releases that include this patch.
Comment 2 errata-xmlrpc 2026-04-09 20:20:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:7350 https://access.redhat.com/errata/RHSA-2026:7350
Comment 3 errata-xmlrpc 2026-04-13 02:22:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:7675 https://access.redhat.com/errata/RHSA-2026:7675
Comment 4 errata-xmlrpc 2026-04-13 02:47:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:7670 https://access.redhat.com/errata/RHSA-2026:7670