Bug 2431998 (CVE-2026-1225)

Summary: CVE-2026-1225 ch.qos.logback/logback-core: Malicious logback.xml configuration file allows instantiation of arbitrary classes
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: abrianik, anthomas, aschwart, asoldano, ataylor, bbaranow, bmaxwell, boliveir, brian.stansberry, ccranfor, chfoley, csutherl, darran.lofthouse, dbruscin, dhanak, dosoudil, drosa, dsimansk, dsoumis, ehelms, fmariani, ggainey, ggrzybek, gmalinko, gtanzill, ibek, istudens, ivassile, iweiss, janstey, jbuscemi, jcantril, jclere, jpechane, jrokos, jscholz, juwatts, kaycoth, kingland, kvanderr, kverlaen, matzew, mhulan, mnovotny, mosmerov, mposolda, msvehla, nmoumoul, nwallace, osousa, parichar, pberan, pbizzarr, pcreech, pdelbell, pesilva, pjindal, plodge, pmackay, rchan, rmartinc, rmaucher, rojacob, rstancel, rstepani, sausingh, sdawley, smaestri, smallamp, ssilvert, sthorger, swoodman, szappis, tasato, tcunning, tmalecek, tom.jenkinson, vmuzikar, yfang
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
ACE vulnerability in configuration file processing by QOS.CH logback-core up to and including version 1.5.24 in Java applications, allows an attacker to instantiate classes already present on the class path by compromising an existing logback configuration file. The instantiation of a potentially malicious Java class requires that said class is present on the user's class-path. In addition, the attacker must have write access to a configuration file.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2433454, 2433455, 2433456, 2433457, 2433458, 2433459, 2433460    
Bug Blocks:    

Description OSIDB Bzimport 2026-01-22 10:01:36 UTC 
ACE vulnerability in configuration file processing  by QOS.CH logback-core up to and including version 1.5.24 in Java applications, allows an attacker to instantiate classes already present on the class path by compromising an existing logback configuration file.




The instantiation of a potentially malicious Java class requires that said class is present on the user's class-path. In addition, the attacker must  have write access to a 
configuration file. However, after successful instantiation, the instance is very likely to be discarded with no further ado.