Bug 2493034 (CVE-2026-47770)

Summary: CVE-2026-47770 jq: jq: Denial of Service via deeply nested array comparison
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, amctagga, aoconnor, aos-team-art-private, asdas, bniver, dpaolell, dschmidt, erezende, flucifre, gmeno, groman, jdelft, jlanda, jmitchel, jupierce, kshier, lgarciaa, mbenjamin, mbiarnes, mhackett, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, simaishi, sostapov, stcannon, suppawar, teagle, vereddy, vlaad, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in jq, a command-line JSON processor. This vulnerability allows a local user or an attacker providing malicious input to cause a denial of service (DoS) by comparing two sufficiently deeply nested arrays using the '==' operator. This action exhausts the C stack due to uncontrolled recursion, leading to a crash of the jq process.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2493257    
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Description OSIDB Bzimport 2026-06-25 18:02:53 UTC 
jq is a command-line JSON processor. Prior to 1.8.2, comparing two sufficiently deeply nested arrays with the == operator exhausts the C stack on jq's ordinary command-line surface, resulting in denial of service via stack exhaustion (uncontrolled recursion). The crash occurs in jq's recursive structural comparison code, with the recursion repeating through jvp_array_equal() and jv_equal() in src/jv.c when comparing deeply nested arrays; a nearby sort comparator path through jv_cmp() in src/jv_aux.c overflows the stack at a larger nesting depth from  the same missing recursion guard. Anyone running jq comparisons on attacker-controlled deeply nested JSON values, or embedding jq in a context  where untrusted data can reach the == comparison path, is affected. This vulnerability is fixed in 1.8.2.