CVE-2026-2240
janet-lang janet compile.c janetc_pop_funcdef out-of-bounds
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.
INFO
Published Date :
Feb. 9, 2026, 4:16 p.m.
Last Modified :
Feb. 25, 2026, 2:43 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Apply the patch `4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5` to janet-lang source.
- Recompile janet-lang after applying the patch.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-2240.
| URL | Resource |
|---|---|
| https://github.com/janet-lang/janet/ | Product |
| https://github.com/janet-lang/janet/commit/4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5 | Patch |
| https://github.com/janet-lang/janet/issues/1702 | ExploitIssue Tracking |
| https://github.com/janet-lang/janet/issues/1702#issuecomment-3790473369 | ExploitIssue Tracking |
| https://github.com/oneafter/0123/blob/main/ja4/repro | Exploit |
| https://vuldb.com/?ctiid.344979 | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.344979 | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.753155 | Third Party AdvisoryVDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-2240 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-2240
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-2240 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-2240 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 25, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:a:janet-lang:janet:*:*:*:*:*:*:*:* versions up to (including) 1.40.1 Added Reference Type VulDB: https://github.com/janet-lang/janet/ Types: Product Added Reference Type VulDB: https://github.com/janet-lang/janet/commit/4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5 Types: Patch Added Reference Type VulDB: https://github.com/janet-lang/janet/issues/1702 Types: Exploit, Issue Tracking Added Reference Type VulDB: https://github.com/janet-lang/janet/issues/1702#issuecomment-3790473369 Types: Exploit, Issue Tracking Added Reference Type VulDB: https://github.com/oneafter/0123/blob/main/ja4/repro Types: Exploit Added Reference Type VulDB: https://vuldb.com/?ctiid.344979 Types: Permissions Required, VDB Entry Added Reference Type VulDB: https://vuldb.com/?id.344979 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/?submit.753155 Types: Third Party Advisory, VDB Entry -
New CVE Received by [email protected]
Feb. 09, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Added CVSS V2 (AV:L/AC:L/Au:S/C:N/I:N/A:P) Added CWE CWE-119 Added CWE CWE-125 Added Reference https://github.com/janet-lang/janet/ Added Reference https://github.com/janet-lang/janet/commit/4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5 Added Reference https://github.com/janet-lang/janet/issues/1702 Added Reference https://github.com/janet-lang/janet/issues/1702#issuecomment-3790473369 Added Reference https://github.com/oneafter/0123/blob/main/ja4/repro Added Reference https://vuldb.com/?ctiid.344979 Added Reference https://vuldb.com/?id.344979 Added Reference https://vuldb.com/?submit.753155