Bug 2508485 (CVE-2026-13697)

Summary: CVE-2026-13697 undici: undici: Information disclosure and Denial of Service via malformed Cache-Control directives
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: aazores, abarbaro, akhatavk, alizardo, aos-team-art-private, asdas, ataylor, cdrage, cmah, csuconic, dbruscin, dpaolell, dschmidt, eaguilar, ebaron, eborisov, ehugonne, gbenhaim, gtanzill, gtully, ikhan, jbuscemi, jchui, jdelft, jhe, jlanda, jmatsuok, jsherman, jtolenti, jupierce, kshier, ktsao, kvanderr, lball, lchilton, lgarciaa, mbiarnes, mstipich, nboldt, ngough, niyer, oaljalju, pjindal, ppalepu, ppostler, prdhamdh, psrna, rbobbitt, rexwhite, rgemmell, rgodfrey, rhel-process-autobot, rushinde, sdawley, sfeifer, sghai, sidsharm, simaishi, stcannon, sthirugn, suppawar, tbish, tlavocat, twaugh, veshanka, vlaad, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in undici. This vulnerability allows for cross-user information disclosure when malformed Cache-Control private directives cause private response bodies and headers, such as Set-Cookie data, to be stored in a shared cache and subsequently exposed to other users. Additionally, a specially crafted Cache-Control header can trigger an unhandled error in the cache parser, leading to a process termination and a Denial of Service (DoS). Both issues affect applications using the cache interceptor in shared mode.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-07-29 17:01:54 UTC 
undici's cache interceptor mishandles malformed Cache-Control private directives. In undici 7.0.0 up to before 7.29.0 and 8.0.0 up to before 8.9.0, a response carrying a degenerate qualified private directive, such as private set to an empty value, can be stored in the default shared cache and later served to a different caller with the same cache key, disclosing private response bodies and headers including Set-Cookie. Separately, a Cache-Control header that combines an unqualified private directive with a qualified one triggers an uncaught TypeError in the cache-control parser, which rejects the request and, depending on the consumer's error handling, can terminate the process. Both issues affect applications using the cache interceptor in shared mode, including the default configuration. The issues are fixed in undici 7.29.0 and 8.9.0.