CVE-2026-10268: janet-lang janet

janet-lang janet marsh.c unmarshal_one_fiber integer overflow

CVSS 4.8 MediumEPSS 0.0012 · 1st percentile

Published by the CVE Program (CNA: VulDB) at 1 Jun 2026, 15:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
janet-lang	janet	affected 1.0 affected 1.1 affected 1.2 affected 1.3 affected 1.4 affected 1.5 affected 1.6 affected 1.7 affected 1.8 affected 1.9 affected 1.10 affected 1.11 and 30 more

Identifiers

CVE-2026-10268

CNA

VulDB

Weakness (CWE)

CWE-189 · CWE-190

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.8	Medium	4.0	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	CNA (VulDB)Used for this record
3.3	Low	3.1	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	CNA (VulDB)
3.3	Low	3.0	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	CNA (VulDB)
1.7	Low	2.0	AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C	CNA (VulDB)

CISA KEV Not listed.
EPSS 0.0012, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 1 Jun 2026. New records show when each source confirmed them.

Sources

References from the CNA

vuldb.com/vuln/367547 vdb-entrytechnical-description
vuldb.com/vuln/367547/cti signaturepermissions-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/janet-lang/janet/commit/d9b1d711ea1fde52ac73a82088b512a3e17bad0d patch
github.com/janet-lang/janet/ product
github.com/biniamf/pocs/tree/main/janet-marsh-unmarshal-intovf exploit

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.