CVE-2026-2705Public exploitNetwork attack vector

Process crash via malformed MOL2 atom ID

Published Feb 19, 2026 · Updated Feb 19, 2026

NULL pointer dereference in Open Babel 3.1.1 and earlier allows attackers to crash a parsing process with a crafted MOL2 file. The MOL2 parser accepts an invalid atom ID, lets GetAtom return NULL, and calls OBAtom::SetFormalCharge on that pointer without checking it. The target must open the file through obabel, the OBConversion API, or a language binding; successful triggering terminates the parsing process without reported data disclosure or modification.

CVSS severity8.1
High
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Open Babel 3.1.1 and earlier allows attackers to crash a parsing process with a crafted MOL2 file. The MOL2 parser accepts an invalid atom ID, lets GetAtom return NULL, and calls OBAtom::SetFormalCharge on that pointer without checking it. The target must open the file through obabel, the OBConversion API, or a language binding; successful triggering terminates the parsing process without reported data disclosure or modification.

The record

CVE
CVE-2026-2705
Published
Feb 19, 2026
Updated
Feb 19, 2026
Vendor
Open Babel
Product
Open Babel
Classifications
CWE-125, CWE-119, CWE-476, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.1.0
  2. Affected versionversion=3.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open Babel · Open Babelversion=3.1.0; version=3.1.1

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
5.0VulDB CNAAV:N/AC:L/Au:N/C:N/I:N/A:P
2.1VulDB CNACVSS: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
4.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-476NULL Pointer Dereference
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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