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Description

A vulnerability was detected in Open Babel up to 3.1.1. The impacted element is the function OBAtom::SetFormalCharge in the library include/openbabel/atom.h of the component MOL2 File Handler. The manipulation results in out-of-bounds read. It is possible to launch the attack remotely. The exploit is now public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

PUBLISHED Reserved 2026-02-18 | Published 2026-02-19 | Updated 2026-02-23 | Assigner VulDB




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
MEDIUM: 4.3CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
5.0AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:ND/RC:UR

Problem types

Out-of-Bounds Read

Memory Corruption

Timeline

2026-02-18:Advisory disclosed
2026-02-18:VulDB entry created
2026-02-21:VulDB entry last update

Credits

Oneafter (VulDB User) reporter

References

vuldb.com/?id.346651 (VDB-346651 | Open Babel MOL2 File atom.h SetFormalCharge out-of-bounds) vdb-entry technical-description

vuldb.com/?ctiid.346651 (VDB-346651 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.754379 (Submit #754379 | openbabel master-branch NULL Pointer Dereference) third-party-advisory

github.com/openbabel/openbabel/issues/2848 issue-tracking

github.com/oneafter/0128/blob/main/ob2/repro.mol2 exploit

cve.org (CVE-2026-2705)

nvd.nist.gov (CVE-2026-2705)

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