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

CVSS 7.1 · High EPSS 0.15% · P5

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProductVersion RangeStatus
jqlangjq< 1.8.2affected
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I. Basic Information for CVE-2026-49839

Vulnerability Information
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Vulnerability Title
jq --rawfile invalid-state reuse after String too long causes heap-buffer-overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
jqlang jq 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
jqlang jq是jqlang团队开源的一个轻量级且灵活的命令行 JSON 处理器。 jqlang jq 1.8.2之前版本存在缓冲区错误漏洞，该漏洞源于处理超大字符串错误时，可能导致无效状态重用和基于堆的越界写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
jqlangjq < 1.8.2 -

II. Public POCs for CVE-2026-49839

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 7187 chars
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III. Intelligence Information for CVE-2026-49839

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Vendor Advisories for CVE-2026-49839 (1)

Same Patch Batch · jqlang · 2026-06-25 · 3 CVEs total

CVE-2026-47770jq: stack overflow in deep structural equality
CVE-2026-54679jq: potential integer overflow in jvp_string_append

IV. Related Vulnerabilities

Same product: jq
Same vendor: jqlang
Same weakness: CWE-787

V. Comments for CVE-2026-49839

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