Buffer overflow in Janet-Lang Janet
CVE-2026-2241
A vulnerability was found in janet-lang janet up to 1.40.1. This affects the function os_strftime of the file src/core/os.c. Performing a manipulation results in out-of-bounds read. The attack must be initiated from a local position. The exploit has been made public and could be used. The patch is named 0f285855f0e34f9183956be5f16e045f54626bff. To fix this issue, it is recommended to deploy a patch.
Vulnerability class: Buffer Overflow
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: 0.002 (6.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Janet-Lang Janet — versions 1.40.0, 1.40.1
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/janet-lang/janet/issues/1701 (issue-tracking, Exploit, Issue Tracking)
- github.com/janet-lang/janet/issues/1701 (issue-tracking, Exploit, Issue Tracking)
- github.com/oneafter/0123/blob/main/ja3/repro (Exploit, exploit)
- github.com/janet-lang/janet/commit/0f285855f0e34f9183956be5f16e045f54626bff (Patch, patch)
- github.com/janet-lang/janet/ (Product, product)
Frequently asked questions
- What is CVE-2026-2241?
- CVE-2026-2241 is a low-severity vulnerability in Janet-Lang Janet, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 3.3/10. Published 2026-02-09.
- How severe is CVE-2026-2241?
- Low severity. CVSS v3 base score is 3.3 out of 10.