{"id":"CVE-2026-39979","state":"PUBLISHED","title":"jq: Out-of-Bounds Read in jv_parse_sized() Error Formatting for Non-NUL-Terminated Counted Buffers","description":"jq is a command-line JSON processor. In commits before 2f09060afab23fe9390cce7cb860b10416e1bf5f, the jv_parse_sized() API in libjq accepts a counted buffer with an explicit length parameter, but its error-handling path formats the input buffer using %s in jv_string_fmt(), which reads until a NUL terminator is found rather than respecting the caller-supplied length. This means that when malformed JSON is passed in a non-NUL-terminated buffer, the error construction logic performs an out-of-bounds read past the end of the buffer. The vulnerability is reachable by any libjq consumer calling jv_parse_sized() with untrusted input, and depending on memory layout, can result in memory disclosure or process termination. 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AppStream E4S (v.9.0)"},{"lang":"en","value":"RHSA-2026:18044: Red Hat Enterprise Linux AppStream E4S (v.9.2)"},{"lang":"en","value":"RHSA-2026:18040: Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)"},{"lang":"en","value":"RHSA-2026:16692: Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)"},{"lang":"en","value":"RHSA-2026:19151: Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)"},{"lang":"en","value":"RHSA-2026:18043: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux BaseOS EUS (v.9.4)"},{"lang":"en","value":"RHSA-2026:18042: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6)"},{"lang":"en","value":"RHSA-2026:16693: Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)"},{"lang":"en","value":"RHSA-2026:19365: Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)"},{"lang":"en","value":"RHSA-2026:25096: Red Hat AI Inference Server 3.2"},{"lang":"en","value":"RHSA-2026:30078: Red Hat AI Inference Server 3.3"},{"lang":"en","value":"RHSA-2026:30089: Red Hat AI Inference Server 3.3"},{"lang":"en","value":"RHSA-2026:30088: Red Hat AI Inference Server 3.3"},{"lang":"en","value":"RHSA-2026:30087: Red Hat AI Inference Server 3.3"},{"lang":"en","value":"RHSA-2026:8579: Red Hat Hardened Images"}],"timeline":[{"lang":"en","time":"2026-04-13T23:01:01.219Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-04-13T22:18:56.252Z","value":"Made public."}],"workarounds":[{"lang":"en","value":"To mitigate this issue, manually ensure that every buffer is NUL-terminated before passing it to the 'jv_parse_sized' function."}],"x_adpType":"supplier","x_generator":{"engine":"sadp-cli 1.0.0"}}]}}}