CVE-2026-49839 – jq –rawfile invalid-state reuse after String too long causes heap-buffer-overflow

CVE ID :CVE-2026-49839

Published : June 25, 2026, 5:17 p.m. | 27 minutes ago

Description :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.

Severity: 0.0 | NA

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