janet-lang janet compile.c janetc_pop_funcdef out-of-bounds
Published Feb 9, 2026
4.8
MEDIUMCVSS 4.0
EPSS 0.17%
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.
Affected products
-
- Version 1.40.0StatusaffectedConstraints-
- Version 1.40.1StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Janet-Lang | Janet | n/a |
|
- ≤ 1.40.1
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
1 other source (NVD) ▾
CVSS:4.0/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
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
1 other source (CVE.org) ▾
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C
1 other source (NVD) ▾
AV:L/AC:L/Au:S/C:N/I:N/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Feb 9, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Feb–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.17% (0.00167) | 5.41th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.16% (0.00157) | 5.25th | v5 (v2026.06.15) |
| Feb 10, 2026 | 0.01% (0.00013) | 1.70th | v4 (v2025.03.14) |
References (8)
- https://github.com/janet-lang/janet/ product
- https://github.com/janet-lang/janet/commit/4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5 patch
- https://github.com/janet-lang/janet/issues/1702 issue-trackingExploitIssue Tracking
- https://github.com/janet-lang/janet/issues/1702#issuecomment-3790473369 issue-trackingExploitIssue Tracking
- https://github.com/oneafter/0123/blob/main/ja4/repro exploit
- https://vuldb.com/?ctiid.344979 signaturepermissions-requiredPermissions RequiredVDB Entry
- https://vuldb.com/?id.344979 vdb-entrytechnical-descriptionThird Party AdvisoryVDB Entry
- https://vuldb.com/?submit.753155 third-party-advisoryThird Party AdvisoryVDB Entry
| Link | Providers | Tags |
|---|---|---|
| https://github.com/janet-lang/janet/ | product | |
| https://github.com/janet-lang/janet/commit/4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5 | patch | |
| https://github.com/janet-lang/janet/issues/1702 | issue-trackingExploitIssue Tracking | |
| https://github.com/janet-lang/janet/issues/1702#issuecomment-3790473369 | issue-trackingExploitIssue Tracking | |
| https://github.com/oneafter/0123/blob/main/ja4/repro | exploit | |
| https://vuldb.com/?ctiid.344979 | signaturepermissions-requiredPermissions RequiredVDB Entry | |
| https://vuldb.com/?id.344979 | vdb-entrytechnical-descriptionThird Party AdvisoryVDB Entry | |
| https://vuldb.com/?submit.753155 | third-party-advisoryThird Party AdvisoryVDB Entry |
Change history (0)
No recorded changes yet.