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.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-787"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49839.json"
}

References

Affected packages

Git / github.com/jqlang/jq

Affected ranges

Type

GIT

Repo

https://github.com/jqlang/jq

Events

Introduced

Fixed

34f7186b86743a083a589741b6cea95293524108

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.8.2"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "cpe":  "cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.8.2"
                }
            ],
            "source":  "CPE_RANGE"
        }
    ]
}

Affected versions

1.*

1.6rc2

jq-1.*

jq-1.0

jq-1.1

jq-1.2

jq-1.3

jq-1.4

jq-1.5rc1

jq-1.5rc2

jq-1.6

jq-1.6rc1

jq-1.7

jq-1.7.1

jq-1.7rc1

jq-1.7rc2

jq-1.8.0

jq-1.8.1

jq-1.8.2rc1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49839.json"