CVE-2026-49839
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In jq prior to 1.8.2, using `--rawfile` with an attacker-controlled file can cause a heap out-of-bounds write in builds without assertions. The bug is due to the loop not stopping after a 'String too long' error, leading to operations on an invalid object.
Risk Assessment
An attacker could exploit this vulnerability to cause a crash or potentially execute arbitrary code in the context of the user running jq, posing a risk to data integrity and confidentiality.
Recommendation
Immediately update jq to version 1.8.2 or later, which contains the fix for this vulnerability.
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Original NVD description (English source)
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.