CVE-2026-2240— janet-lang janet compile.c janetc_pop_funcdef out-of-bounds
Quick assessment
Affected
janet-lang janet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Janet是Janet Language开源的一种函数式和命令式编程语言和字节码解释器。 Janet 1.40.1及之前版本存在缓冲区错误漏洞，该漏洞源于函数janetc_pop_funcdef存在越界读取，可能导致信息泄露。
Possible ATT&CK Techniques 2 AI
T1203 · Exploitation for Client Execution T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-2240
Vulnerability Information
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Vulnerability Title
janet-lang janet compile.c janetc_pop_funcdef out-of-bounds
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been found in janet-lang janet up to 1.40.1. The impacted element is the function janetc_pop_funcdef of the file src/core/compile.c. Such manipulation leads to out-of-bounds read. The attack must be carried out locally. The exploit has been disclosed to the public and may be used. The name of the patch is 4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5. A patch should be applied to remediate this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Janet 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Janet是Janet Language开源的一种函数式和命令式编程语言和字节码解释器。 Janet 1.40.1及之前版本存在缓冲区错误漏洞，该漏洞源于函数janetc_pop_funcdef存在越界读取，可能导致信息泄露。
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| janet-lang | janet | 1.40.0 | - |
|
II. Public POCs for CVE-2026-2240
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · janet-lang · 2026-02-09 · 3 CVEs total
| CVE-2026-2241 | 3.3 LOW | janet-lang janet os.c os_strftime out-of-bounds |
| CVE-2026-2242 | 3.3 LOW | janet-lang janet specials.c janetc_if out-of-bounds |
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CVE-2026-10268
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CVE-2026-2242
janet-lang janet specials.c janetc_if out-of-bounds -
CVE-2026-2241
janet-lang janet os.c os_strftime out-of-bounds
Same vendor: janet-lang
-
CVE-2026-10268
janet-lang janet marsh.c unmarshal_one_fiber integer overflo -
CVE-2026-10267
janet-lang janet debug.c doframe out-of-bounds -
CVE-2026-2869
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CVE-2026-2242
janet-lang janet specials.c janetc_if out-of-bounds -
CVE-2026-2241
janet-lang janet os.c os_strftime out-of-bounds
Same weakness: CWE-125
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V. Comments for CVE-2026-2240
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