Bug 2556002 (CVE-2026-110095)

Summary: CVE-2026-110095 fast-uri: fast-uri: Path traversal via improper relative URI normalization
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, abrianik, akhatavk, alizardo, anpicker, anthomas, aos-team-art-private, asdas, bbrownin, brasmith, bsmejkal, cdrage, cmah, cmyers, cochase, csuconic, dbruscin, dhanak, dnakabaa, doconnor, dpaolell, dranck, drosa, dschmidt, dsimansk, eaguilar, ebaron, ehelms, ggainey, ggrzybek, gparvin, gtully, hasun, ikhan, jachapma, jbalunas, jchui, jdelft, jfula, jhe, jlanda, jmatsuok, jowilson, jpasqual, jraez, jsherman, jtolenti, jupierce, juwatts, jwong, kaycoth, kingland, kshier, ktsao, kvanderr, lchilton, lcouzens, lgarciaa, lryznaro, mbiarnes, mdellweg, mhulan, mnovotny, mreynolds, msauton, mstipich, nboldt, nmoumoul, nyancey, oaljalju, omaciel, ometelka, osousa, parichar, pcreech, pjindal, ppalepu, ppostler, prdhamdh, progier, psrna, ptisnovs, rbobbitt, rchan, rexwhite, rgemmell, rgodfrey, rhaigner, rhel-process-autobot, rjohnson, rushinde, sausingh, sdawley, sfeifer, sghai, sidsharm, simaishi, smallamp, snegrini, spichugi, stcannon, sthirugn, suppawar, syedriko, tasato, tbish, tbordaz, tlavocat, tmalecek, tsze, ttakamiy, vashirov, vlaad, watson-tool-maintainers, xdharmai, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in fast-uri. The library improperly applies dot-segment removal to relative Uniform Resource Identifier (URI) paths during normalization, causing leading parent-directory segments to be discarded. A remote attacker could supply a crafted relative path to an application that relies on fast-uri for resolution, caching, or authorization. This can cause the reference to escape its intended directory, potentially allowing unauthorized access to restricted resources.
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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: 2559134, 2559137, 2559138, 2559139, 2559140, 2559142, 2559143, 2559144, 2559145, 2559146, 2559147, 2559150, 2559151, 2559152, 2559131, 2559148    
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Description OSIDB Bzimport 2026-10-20 07:01:20 UTC 
fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions before 2.4.8, from 3.0.0 through 3.1.8, and from 4.0.0 through 4.2.2, the normalize() and serialize() functions apply RFC 3986 dot-segment removal to the path of a relative-path reference, even though that algorithm is defined only for the merged target path during resolution, so a leading parent-directory segment can be dropped and a document-relative reference can become root-relative. An application that normalizes an attacker-supplied or user-supplied relative reference and then resolves it, or uses it as a cache, deduplication, or authorization key, can have the reference escape its intended directory and point at a different resource. The issue is fixed in fast-uri 2.4.8, 3.1.9, and 4.2.3, and users should upgrade to one of these versions or later. As a workaround, resolve a relative reference against its absolute base first and normalize the absolute result instead of normalizing the reference beforehand.