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Janet Language CVE-2026-10267

| EUVD-2026-33654 LOW
Buffer Overflow (CWE-119)
2026-06-01 cna@vuldb.com GHSA-mmcx-pc5f-m5m4
Buffer Overflow
1.9
CVSS 4.0 · NVD

Severity by source

NVD PRIMARY
1.9 LOW
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/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
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Jun 01, 2026 - 15:35 vuln.today
Analysis Generated
Jun 01, 2026 - 15:35 vuln.today

DescriptionCVE.org

A security flaw has been discovered in janet-lang janet up to 1.41.0. This affects the function doframe of the file src/core/debug.c. Performing a manipulation results in out-of-bounds read. Attacking locally is a requirement. The exploit has been released to the public and may be used for attacks. The patch is named ed17dd2c5913a23fb1107251e44a9410a3c30cf5.

AnalysisAI

Out-of-bounds read in janet-lang/janet up to version 1.41.0 allows a local low-privileged attacker to read memory beyond allocated bounds via the doframe debug introspection function in src/core/debug.c. The root cause is missing bounds validation when using symbolmap entries (specifically jsm.death_pc and jsm.slot_index) as array indices into function environments and stack data. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Gain local low-privilege shell access
Delivery
Craft Janet function with malformed symbolmap (death_pc or slot_index out of bounds)
Exploit
Invoke Janet debug introspection (doframe) on crafted function
Execution
Out-of-bounds read of heap or fiber stack memory
Impact
Exfiltrate leaked Janet program data
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Vulnerability AssessmentAI

Exploitation Local access with at least low-privilege execution rights on the target system is required (CVSS AV:L/PR:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The aggregate risk picture is low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A local user with low-privilege shell access on a system running Janet crafts or supplies a Janet function with a malformed symbolmap entry - setting death_pc or slot_index to an out-of-range value - then triggers Janet's debug introspection via doframe(), causing the interpreter to read memory beyond the intended environment or stack array. A proof-of-concept is publicly available at https://github.com/biniamf/pocs/tree/main/janet-debug-janet-doframe-env-data-oobread, demonstrating the read primitive. …
Remediation Apply the upstream fix by updating to a Janet release that incorporates commit ed17dd2c5913a23fb1107251e44a9410a3c30cf5. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-10267 vulnerability details – vuln.today
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