Bug 2469175 (CVE-2026-43894)

Summary: CVE-2026-43894 jq: jq: Arbitrary Code Execution or Denial of Service via Signed Integer Overflow
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, smcdonal, 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 tool used for processing JSON data from the command line. A remote attacker can exploit a vulnerability by providing a specially crafted large number as input. This can cause an internal calculation error, leading to a memory overflow where the attacker can write their own data into the system's memory, potentially resulting in the application crashing (Denial of Service).
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Description OSIDB Bzimport 2026-05-11 18:01:57 UTC 
jq is a command-line JSON processor. In 1.8.1 and earlier, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a 30-byte stack buffer, and then writes ≈715 million 16-bit units (≈1.4 GiB) at an offset 1.43 GiB below the stack frame. The written content is fully attacker-controlled (the parsed decimal digits, packed 3-per-unit).