Bug 2510719 (CVE-2026-69153)

Summary:	CVE-2026-69153 postcss: PostCSS: Information disclosure via crafted sourceMappingURL
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aazores, abarbaro, abrianik, akostadi, alizardo, amasferr, anpicker, anthomas, anujha, aruklets, aschwart, asoldano, aszczucz, ataylor, bbaranow, bbrownin, bmaxwell, boliveir, brasmith, bstansbe, cdrage, chfoley, cmah, cmyers, cochase, dbruscin, dkeler, dlofthou, dmayorov, dnakabaa, doconnor, dranck, drichtar, dschmidt, dymurray, eaguilar, ebaron, eborisov, ehelms, ehugonne, ewittman, fmariani, ggainey, ggrzybek, gmalinko, gotiwari, gparvin, hasun, ibolton, istudens, ivassile, iweiss, janstey, jchui, jfula, jhe, jhorak, jlanda, jlledo, jmatsuok, jmatthew, jmontleo, jowilson, jpasqual, jraez, jtolenti, juwatts, jwong, jwon, kaycoth, kshier, ktsao, kvanderr, lball, lchilton, lcouzens, mcarlett, mdellweg, mhulan, mosmerov, mposolda, msvehla, mvyas, nboldt, ngough, nipatil, nmoumoul, nwallace, nyancey, oaljalju, omaciel, ometelka, osousa, pantinor, parichar, pberan, pcreech, pesilva, pgaikwad, pjindal, pmackay, prwatson, psrna, ptisnovs, rchan, rgodfrey, rhaigner, rhel-process-autobot, rjohnson, rkubis, rmartinc, rstancel, rstepani, rushinde, sdawley, sfeifer, simaishi, slucidi, smallamp, sseago, ssilvert, stcannon, sthorger, suppawar, swoodman, syedriko, tasato, tcunning, teagle, thason, thjenkin, tmalecek, tsedmik, ttakamiy, vdosoudi, veshanka, vmuzikar, watson-tool-maintainers, xdharmai, yfang, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in PostCSS. A remote attacker can exploit this vulnerability by providing a specially crafted sourceMappingURL when a specific configuration (the 'from' parameter) is not set. This can cause the application to read and expose unintended source-map files, potentially revealing sensitive information about the application's source code.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-03 18:01:24 UTC

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map’s sources and sourcesContent may then be exposed to the application. This issue is fixed in version 8.5.19.

Comment 2 errata-xmlrpc 2026-08-20 16:07:44 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:57590 https://access.redhat.com/errata/RHSA-2026:57590