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Description

A vulnerability was identified in janet-lang janet up to 1.40.1. Affected by this vulnerability is the function janetc_varset of the file src/core/specials.c of the component handleattr Handler. The manipulation leads to out-of-bounds read. The attack can only be performed from a local environment. The exploit is publicly available and might be used. Upgrading to version 1.41.0 addresses this issue. The identifier of the patch is 2fabc80151a2b8834ee59cda8a70453f848b40e5. The affected component should be upgraded.

PUBLISHED Reserved 2026-02-20 | Published 2026-02-21 | Updated 2026-02-23 | Assigner VulDB




MEDIUM: 4.8CVSS: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
LOW: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
LOW: 3.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
1.7AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C

Problem types

Out-of-Bounds Read

Memory Corruption

Product status

1.40.0
affected

1.40.1
affected

1.41.0
unaffected

Timeline

2026-02-20:Advisory disclosed
2026-02-20:VulDB entry created
2026-02-20:VulDB entry last update

Credits

Oneafter (VulDB User) reporter

References

vuldb.com/?id.347106 (VDB-347106 | janet-lang janet handleattr specials.c janetc_varset out-of-bounds) vdb-entry technical-description

vuldb.com/?ctiid.347106 (VDB-347106 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.754589 (Submit #754589 | janet-lang janet 4dd08a4 Heap-based Buffer Overflow) third-party-advisory

github.com/janet-lang/janet/issues/1699 issue-tracking

github.com/oneafter/0123/blob/main/ja1/repro exploit

github.com/...ommit/2fabc80151a2b8834ee59cda8a70453f848b40e5 patch

github.com/janet-lang/janet/releases/tag/v1.41.0 patch

github.com/janet-lang/janet/ product

cve.org (CVE-2026-2869)

nvd.nist.gov (CVE-2026-2869)

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