Integer overflow in Janet-Lang Janet
CVE-2026-10268
A weakness has been identified in janet-lang janet up to 1.41.0. This vulnerability affects the function unmarshal_one_fiber of the file src/core/marsh.c. Executing a manipulation can lead to integer overflow. It is possible to launch the attack on the local host. The exploit has been made available to the public and could be used for attacks. This patch is called d9b1d711ea1fde52ac73a82088b512a3e17bad0d. A patch should be applied to remediate this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.001 (1.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000
Affected products
- Janet-Lang Janet — versions 1.0, 1.1, 1.2
Weakness classification (CWE)
References
- vuldb.com/vuln/367547 (technical-description, vdb-entry)
- vuldb.com/vuln/367547/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-10268 (third-party-advisory)
- vuldb.com/submit/825075 (third-party-advisory)
- github.com/janet-lang/janet/issues/1744 (issue-tracking)
- github.com/biniamf/pocs/tree/main/janet-marsh-unmarshal-intovf (exploit)
- github.com/janet-lang/janet/commit/d9b1d711ea1fde52ac73a82088b512a3e17bad0d (patch)
- github.com/janet-lang/janet/ (product)
Frequently asked questions
- What is CVE-2026-10268?
- CVE-2026-10268 is a low-severity vulnerability in Janet-Lang Janet, classified under CWE-189. CVSS score: 3.3/10. Published 2026-06-01.
- How severe is CVE-2026-10268?
- Low severity. CVSS v3 base score is 3.3 out of 10.