Bug 2381728 (CVE-2025-7339)

Summary:	CVE-2025-7339 on-headers: on-headers vulnerable to http response header manipulation
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	aazores, abarbaro, abrianik, adkhan, adudiak, anjoseph, anpicker, bdettelb, bparees, brasmith, caswilli, cmah, cochase, crizzo, dbosanac, dhanak, doconnor, dranck, drosa, dsimansk, dymurray, eaguilar, ebaron, eric.wittmann, ggrzybek, gmalinko, gryan, gzaronik, haoli, hasun, hkataria, ibek, ibolton, jajackso, janstey, jcammara, jchui, jfula, jhe, jhuff, jkoehler, jmatthew, jmitchel, jmontleo, jneedle, jolong, jowilson, jprabhak, jreimann, jrokos, jwendell, jwong, kaycoth, kegrant, kingland, koliveir, kshier, ktsao, kverlaen, lphiri, mabashia, manissin, matzew, mdessi, mnovotny, mrizzi, mwringe, nboldt, nipatil, nyancey, omaciel, ometelka, pantinor, parichar, pbizzarr, pbraun, pcattana, pdelbell, pgaikwad, pjindal, psrna, ptisnovs, rcernich, rjohnson, rkubis, rstepani, sausingh, shvarugh, simaishi, slucidi, smcdonal, sseago, stcannon, syedriko, tasato, teagle, tfister, thavo, ttakamiy, wtam, xdharmai, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A header modification flaw has been discovered in the on-headers npm library. In specific cases, response headers may be inadvertently modified when an array is passed to `response.writeHead()`.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2381749, 2381750, 2381751, 2381757, 2381758, 2381759, 2381760, 2381761, 2381762, 2381752, 2381753, 2381754, 2381755, 2381756
Bug Blocks:

Description OSIDB Bzimport 2025-07-17 16:01:30 UTC

on-headers is a node.js middleware for listening to when a response writes headers. A bug in on-headers versions `<1.1.0` may result in response headers being inadvertently modified when an array is passed to `response.writeHead()`. Users should upgrade to version 1.1.0 to receive a patch. Uses are strongly encouraged to upgrade to `1.1.0`, but this issue can be worked around by passing an object to `response.writeHead()` rather than an array.