Bug 2418677 (CVE-2025-61727)

Summary: CVE-2025-61727 golang: crypto/x509: excluded subdomain constraint does not restrict wildcard SANs
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aazores, abarbaro, adistefa, akostadi, akoudelk, alcohan, alizardo, amasferr, amctagga, anjoseph, anpicker, ansmith, anthomas, aoconnor, asatyam, bbrownin, bdettelb, bniver, bparees, carogers, chfoley, ckandaga, cmah, crizzo, dhanak, diagrawa, dmayorov, doconnor, drosa, dsimansk, dymurray, eaguilar, ebaron, eglynn, ehelms, erezende, fdeutsch, flucifre, ggainey, gmeno, gparvin, groman, haoli, hasun, hkataria, ibolton, jaharrin, jajackso, jbalunas, jburrell, jcammara, jcantril, jchui, jeder, jfula, jhe, jjoyce, jkoehler, jlledo, jmatthew, jmitchel, jmontleo, jneedle, jolong, jowilson, jprabhak, jschluet, juwatts, kegrant, kingland, koliveir, kshier, ktsao, kverlaen, lball, lbragsta, lchilton, lgamliel, lhh, lphiri, lsvaty, mabashia, manissin, matzew, mbenjamin, mbocek, mburns, mgarciac, mhackett, mhulan, mnovotny, mrunge, mwringe, nboldt, ngough, nmoumoul, nyancey, ometelka, oramraz, osousa, owatkins, pahickey, pantinor, pbraun, pcreech, peholase, pgaikwad, pgrist, pjindal, psrna, ptisnovs, pvasanth, rchan, rfreiman, rhaigner, rjohnson, rojacob, sabiswas, sakbas, sausingh, sdawley, sfeifer, shvarugh, simaishi, slucidi, smallamp, smcdonal, smullick, sostapov, sseago, stcannon, stirabos, swoodman, syedriko, teagle, tfister, thason, thavo, tmalecek, tsedmik, vereddy, veshanka, vimartin, wenshen, whayutin, wtam, xdharmai, xiyuan, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the crypto/x509 package in the Go standard library. This vulnerability allows a certificate validation bypass via an excluded subdomain constraint in a certificated chain as it does not restrict the usage of wildcard SANs in the leaf certificate.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-12-03 20:01:45 UTC
An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com.