Bug 2528130 (CVE-2026-85242)

Summary:	CVE-2026-85242 PlaywrightCapture: PlaywrightCapture: Server-Side Request Forgery via favicon redirect
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability-draft	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	alinfoot, anpicker, anthomas, aprice, bbrownin, bparees, brasmith, cahl, cmyers, cochase, dfreiber, dnakabaa, dranck, drow, dschmidt, dtrifiro, ebourniv, ehelms, ggainey, gtanzill, hasun, ilpinto, jburrell, jbuscemi, jdobes, jfula, jlanda, jmitchel, jowilson, jpasqual, jsamir, juwatts, jwong, kaycoth, kshier, lbrazdil, lcouzens, ljawale, ltomasbo, mdellweg, mhulan, mminar, msilmser, nmoumoul, nyancey, oezr, omaciel, ometelka, orabin, osousa, pakotvan, pcreech, ptisnovs, rbiba, rbryant, rchan, rjohnson, sbunciak, simaishi, smallamp, sskracic, stcannon, sthirugn, syedriko, teagle, tmalecek, tpfromme, ttakamiy, vkumar, weaton, xdharmai, yguenane, ykashtan, zzhou
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in PlaywrightCapture. This vulnerability, known as Server-Side Request Forgery (SSRF), allows an attacker to bypass network restrictions. By manipulating a favicon URL to redirect to an internal network address, an attacker can trick the PlaywrightCapture host into making requests to services that should not be externally accessible. This could enable the attacker to probe internal systems or potentially gain unauthorized access to information.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-03 16:33:15 UTC

PlaywrightCapture contains a server-side request forgery (SSRF) vulnerability in its favicon retrieval functionality. When only_global_lookup is enabled, the application validates the initial favicon URL to prevent requests to localhost, loopback, or other non-public network addresses. However, redirects followed by aiohttp were not subjected to the same validation.


An attacker able to influence the content of a page processed by PlaywrightCapture could specify a publicly reachable favicon URL that responds with an HTTP redirect to a local or otherwise restricted address, such as 127.0.0.1, localhost, or an internal network service. Because aiohttp automatically followed the redirect, the resulting request could bypass the application's local-address restrictions and cause the PlaywrightCapture host to issue HTTP requests to resources that should not be externally reachable.


Depending on the services reachable from the PlaywrightCapture host and how retrieved favicon data is subsequently exposed or processed, this could be used to probe internal HTTP services or potentially obtain information from otherwise inaccessible endpoints.


The patch introduces an aiohttp request middleware that applies the existing local-URL validation to every request in the redirect chain. Requests resolving to restricted/local destinations are rejected before they are issued.