CVE-2026-49839 (GCVE-0-2026-49839)

Vulnerability from cvelistv5 – Published: 2026-06-25 17:17 – Updated: 2026-06-25 17:55
VLAI
Title
jq --rawfile invalid-state reuse after String too long causes heap-buffer-overflow
Summary
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
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-25 17:55 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
jqlang jq Affected: < 1.8.2
guessed Create a notification for this product.
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