Bug 2463297 (CVE-2026-40970)

Summary: CVE-2026-40970 Spring Boot: Spring Boot: Missing hostname verification in Elasticsearch auto-configuration allows information disclosure
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, aschwart, asoldano, aszczucz, ataylor, bbaranow, bmaxwell, boliveir, bstansbe, dbruscin, dhanak, dlofthou, drichtar, drosa, fmariani, ggrzybek, gmalinko, gtanzill, ibek, istudens, ivassile, iweiss, janstey, jbuscemi, jraez, jrokos, kaycoth, kvanderr, mnovotny, mosmerov, mposolda, msvehla, nwallace, parichar, pberan, pbizzarr, pdelbell, pesilva, pjindal, pmackay, rhel-process-autobot, rmartinc, rstancel, rstepani, sausingh, sdawley, smaestri, ssilvert, sthorger, tasato, tcunning, thjenkin, vdosoudi, vmuzikar, watson-tool-maintainers, yfang
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Spring Boot. When configured to use an SSL (Secure Sockets Layer) bundle, the Elasticsearch auto-configuration component does not perform hostname verification when establishing a connection to the Elasticsearch server. An attacker on an adjacent network could exploit this by performing a man-in-the-middle attack. This could lead to the disclosure or modification of sensitive information exchanged between Spring Boot and the Elasticsearch server.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-04-27 21:01:11 UTC 
When configured to use an SSL bundle, Spring Boot's Elasticsearch auto-configuration does not perform hostname verification when connecting to the Elasticsearch server.

Affected: Spring Boot 4.0.0–4.0.5; upgrade to 4.0.6 or later per vendor advisory.