Bug 2533688 (CVE-2026-86818)

Summary: CVE-2026-86818 fast-uri: fast-uri: Mailto header injection via percent-encoded field-name desynchronization
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aadhikar, abarbaro, abrianik, akhatavk, alizardo, anpicker, anthomas, aos-team-art-private, aruklets, asdas, ataylor, bbrownin, bparees, brasmith, bsmejkal, cdrage, cmyers, cochase, csuconic, dbruscin, dhanak, dnakabaa, doconnor, dpaolell, dranck, drosa, dschmidt, dsimansk, dymurray, ehelms, ehugonne, ewittman, ggainey, ggrzybek, gparvin, gtully, hasun, ibolton, jachapma, janstey, jbalunas, jchui, jdelft, jfula, jhe, jlanda, jmatthew, jmontleo, jowilson, jpasqual, jraez, jsherman, jupierce, juwatts, jwong, kaycoth, kingland, kshier, ktsao, kvanderr, lchilton, lcouzens, lgarciaa, lryznaro, mbiarnes, mdellweg, mhulan, mnovotny, mreynolds, msauton, mstipich, nboldt, nipatil, nmoumoul, nyancey, oaljalju, omaciel, ometelka, osousa, pantinor, parichar, pcreech, pgaikwad, pjindal, ppalepu, ppostler, prdhamdh, progier, psrna, ptisnovs, rchan, rexwhite, rgemmell, rgodfrey, rhaigner, rhel-process-autobot, rjohnson, rkubis, rushinde, sausingh, sdawley, sfeifer, sghai, sidsharm, simaishi, slucidi, smallamp, snegrini, spichugi, sseago, stcannon, sthirugn, suppawar, syedriko, tasato, tbish, tbordaz, teagle, tlavocat, tmalecek, tsze, ttakamiy, vashirov, vlaad, watson-tool-maintainers, xdharmai, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in fast-uri, a Node.js URI parser. In versions 4.1.3 and 4.1.4, the mailto parser incorrectly handles percent-encoded query field names. This desynchronization between parsing and serialization allows an attacker to inject arbitrary recipients, subjects, or body content into mailto URIs. An application that re-serializes a validated mailto URI could unknowingly send emails to unintended recipients or with manipulated content.
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Description OSIDB Bzimport 2026-09-15 10:54:50 UTC 
fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv, that added a mailto scheme parser in version 4.1.3. In versions 4.1.3 and 4.1.4, the mailto parser compares each query field name to the reserved names to, subject, and body while the name is still percent-encoded, and decodes it only when storing it as a generic header, so a percent-encoded spelling of a reserved field name is not recognized as that field at parse time but is re-emitted as the literal field name when the parsed URI is serialized. An application that validates, logs, or displays the recipient list from the first parse and then serializes the URI and sends it can silently gain an attacker-chosen recipient, and the subject and body fields can be smuggled across the same roundtrip. The issue is fixed in fast-uri 4.1.5, and users should upgrade to 4.1.5 or later. As a workaround, do not act on a mailto URI that fast-uri has re-serialized without first decoding and re-validating its recipient, subject, and body fields.