What is CVE-2026-2705?

CVE-2026-2705 is a medium-severity vulnerability in Openbabel Open Babel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 4.3/10. Published 2026-02-19.

How severe is CVE-2026-2705?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Buffer overflow in Openbabel Open Babel

CVE-2026-2705

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 patch is identified as e23a224b8fd9d7c2a7cde9ef4ec6afb4c05aa08a. A patch should be applied to remediate this issue. The project was informed of the problem early through an issue report but has not responded yet.

Vulnerability class: Buffer Overflow

Published 2026-02-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.008 (53.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001

Affected products

Openbabel Open Babel
Open Babel — versions 3.1.0, 3.1.1

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/openbabel/openbabel/issues/2848 (issue-tracking, Exploit, Issue Tracking)
github.com/openbabel/openbabel/pull/2862 (issue-tracking, patch)
github.com/oneafter/0128/blob/main/ob2/repro.mol2 (Exploit, exploit)
github.com/VedantMadane/openbabel/commit/e23a224b8fd9d7c2a7cde9ef4ec6afb4c05aa0… (patch)

Frequently asked questions

What is CVE-2026-2705?: CVE-2026-2705 is a medium-severity vulnerability in Openbabel Open Babel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 4.3/10. Published 2026-02-19.
How severe is CVE-2026-2705?: Medium severity. CVSS v3 base score is 4.3 out of 10.