Vulnerability Details CVE-2026-49839
jq is a command-line JSON processor. Prior to 1.8.2,` jq --rawfile` can turn a handled oversized-string error into invalid-state reuse and a real heap out-of-bounds write in assertion-disabled builds. When jv_load_file(raw=1) reads an attacker-controlled file, it repeatedly appends file chunks to the same jv string accumulator. Once jv_string_append_buf() returns jv_invalid_with_msg("String too long"), the raw-file loop does not stop. If the file contains at least one more byte, the next loop iteration appends a new chunk to an object that is already invalid. With assertions enabled this aborts in jvp_string_ptr(). With assertions disabled, the invalid object is interpreted as a string object and ASan reports heap-buffer-overflow. This vulnerability is fixed in 1.8.2.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 4.6%
CVSS Severity
CVSS v3 Score 7.1
References
Products affected by CVE-2026-49839
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cpe:2.3:a:jqlang:jq:1.0
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cpe:2.3:a:jqlang:jq:1.1
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cpe:2.3:a:jqlang:jq:1.2
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cpe:2.3:a:jqlang:jq:1.3
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cpe:2.3:a:jqlang:jq:1.4
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cpe:2.3:a:jqlang:jq:1.5
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cpe:2.3:a:jqlang:jq:1.6
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cpe:2.3:a:jqlang:jq:1.7
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cpe:2.3:a:jqlang:jq:1.7-37-g88f01a7
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cpe:2.3:a:jqlang:jq:1.7.1
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cpe:2.3:a:jqlang:jq:1.8.0
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cpe:2.3:a:jqlang:jq:1.8.1