Bug 2542790 (CVE-2026-83530)

Summary: CVE-2026-83530 github.com/cel-expr/cel-go: cel-go: Denial of Service via uncontrolled memory allocation
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: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, sghai, sidsharm, suppawar, vlaad
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in cel-go. A user can trigger a Denial of Service (DoS) by submitting an expression that exceeds the configured parser expression size limit. Because memory is allocated proportional to the input length before the limit is validated, processing oversized inputs causes uncontrolled memory consumption.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-28 22:39:47 UTC
A user could provide an expression whose string length is longer than the ParserExpressionSizeLimit() configured on the CEL environment, and a memory allocation would occur proportional to the size of the input before the limit would be checked / enforced.