CVE-2026-10268
CVE-2026-10268 is a low-severity vulnerability with a CVSS 3.x base score of 3.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-189.
Key facts
- Severity: Low (CVSS 3.x base score 3.3)
- CVSS v2: 1.7
- CVSS v4: 1.9
- EPSS exploit prediction: 0% (2nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-33681
- Weakness: CWE-189
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2026-10268?
- CVE-2026-10268 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
- Is CVE-2026-10268 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-10268?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-10268 have an EU (EUVD) identifier?
- Yes. CVE-2026-10268 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33681.
- When was CVE-2026-10268 published?
- CVE-2026-10268 was published on 2026-06-01 and last updated on 2026-06-17.
References
- https://github.com/biniamf/pocs/tree/main/janet-marsh-unmarshal-intovf
- https://github.com/janet-lang/janet/
- https://github.com/janet-lang/janet/commit/d9b1d711ea1fde52ac73a82088b512a3e17bad0d
- https://github.com/janet-lang/janet/issues/1744
- https://vuldb.com/cve/CVE-2026-10268
- https://vuldb.com/submit/825075
- https://vuldb.com/vuln/367547
- https://vuldb.com/vuln/367547/cti
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