CVE-2026-43894— jq: Wild stack write via signed-integer overflow in decNumber D2U() macro
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I. Basic Information for CVE-2026-43894
Vulnerability Information
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Vulnerability Title
jq: Wild stack write via signed-integer overflow in decNumber D2U() macro
Source: NVD (National Vulnerability Database)
Vulnerability Description
jq is a command-line JSON processor. In 1.8.1 and earlier, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a 30-byte stack buffer, and then writes ≈715 million 16-bit units (≈1.4 GiB) at an offset 1.43 GiB below the stack frame. The written content is fully attacker-controlled (the parsed decimal digits, packed 3-per-unit).
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数溢出或超界折返
Source: NVD (National Vulnerability Database)
Vulnerability Title
jq 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
jq是jqlang开源的一个轻量级且灵活的命令行 JSON 处理器。 jq 1.8.1及之前版本存在输入验证错误漏洞，该漏洞源于当decNumberFromString接收INT_MAX-1位数字文字时，D2U()宏在带符号整数算术期间溢出，包装的负值绕过堆分配大小检查，导致函数使用30字节栈缓冲区并写入约7.15亿个16位单元。
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
II. Public POCs for CVE-2026-43894
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- https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4gx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-43894
Same Patch Batch · jqlang · 2026-05-11 · 7 CVEs total
| CVE-2026-43896 | 6.2 MEDIUM | jq: Stack Overflow in Recursive Object Merge |
| CVE-2026-41256 | 5.5 MEDIUM | jq: Embedded NUL truncates top-level jq programs loaded with -f |
| CVE-2026-43895 | 4.4 MEDIUM | jq: Embedded NUL in jq import paths causes local redaction-policy bypass and preserves sen |
| CVE-2026-41257 | jq: Signed-int overflow in `stack_reallocate` (jq VM stack) | |
| CVE-2026-40612 | jq: Stack overflow via unbounded recursion in jv_contains | |
| CVE-2026-44777 | jq: stack overflow in module loading on mutual `include` |
IV. Related Vulnerabilities
Same product: jq
- CVE-2026-43896
jq: Stack Overflow in Recursive Object Merge - CVE-2026-43895
jq: Embedded NUL in jq import paths causes local redaction-p - CVE-2026-44777
jq: stack overflow in module loading on mutual `include` - CVE-2026-41256
jq: Embedded NUL truncates top-level jq programs loaded with - CVE-2026-40612
jq: Stack overflow via unbounded recursion in jv_contains
Same vendor: jqlang
- CVE-2026-43896
jq: Stack Overflow in Recursive Object Merge - CVE-2026-43895
jq: Embedded NUL in jq import paths causes local redaction-p - CVE-2026-44777
jq: stack overflow in module loading on mutual `include` - CVE-2026-41256
jq: Embedded NUL truncates top-level jq programs loaded with - CVE-2026-40612
jq: Stack overflow via unbounded recursion in jv_contains
Same weakness: CWE-190
- CVE-2026-32849
NetBSD Signed Integer Overflow in cryptodev_op via cryptodev - CVE-2021-26380
Trusted OS驱动内存越界致完整性丢失 - CVE-2026-44673
libyang: lyb_read_string() integer overflow → heap buffer ov - CVE-2026-44637
libsixel: integer overflow in parser - CVE-2026-43905
OpenImageIO: JPEG2000 (OpenJPH) signed integer overflow in b
V. Comments for CVE-2026-43894
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