CVE-2020-28636

A code execution vulnerability exists in the Nef polygon-parsing functionality of CGAL libcgal...

10.0 CriticalFix available

A code execution vulnerability exists in the Nef polygon-parsing functionality of CGAL libcgal CGAL-5.1.1. An oob read vulnerability exists in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sloop() slh->twin() An attacker can provide malicious input to trigger this vulnerability.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.88%Up 1.4 points since Apr 14, 2021

What each source reports

CVE List Score used 10.0

Record: CVE-2020-28636
CVSS 3.0: 10.0 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-129
Updated: 2026-11-02

EUVDEUVD-2020-21034 10.0

Record: EUVD-2020-21034
CVSS 3.0: 10.0 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-2rhg-qq9v-fjp8 9.8

A code execution vulnerability exists in the Nef polygon-parsing functionality of CGAL libcgal...

Record: GHSA-2rhg-qq9v-fjp8
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-125, CWE-129
Updated: 2026-11-02

NVD 9.8

Record: CVE-2020-28636
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.0: 10.0 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-129, CWE-125
Updated: 2026-11-02

OSV 9.8

Record: CVE-2020-28636
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2020-28636 9.8

Record: DEBIAN-CVE-2020-28636
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-28636 9.8

Record: UBUNTU-CVE-2020-28636
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.0: 10.0 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

OSVMGASA-2021-0238 No score

Updated cgal packages fix security vulnerabilities

Updated cgal packages fix security vulnerabilities:

An oob read vulnerability exists in Nef_2/PM_io_parser.h PM_io_parser::read_vertex() Face_of[] OOB read. An attacker can provide malicious input to trigger this vulnerability (CVE-2020-28601).

An oob read vulnerability exists in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sloop() slh->twin() An attacker can provide malicious input to trigger this vulnerability (CVE-2020-28636).

An oob read vulnerability exists in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sloop() slh->incident_sface. An attacker can provide malicious input to trigger this vulnerability (CVE-2020-35628).

An oob read vulnerability exists in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sface() sfh->volume(). An attacker can provide malicious input to trigger this vulnerability (CVE-2020-35636).

Record: MGASA-2021-0238
Updated: 2026-11-02

OSVMGASA-2021-0239 No score

Updated cgal packages fix security vulnerabilities

Updated cgal packages fix security vulnerabilities:

An oob read vulnerability exists in Nef_2/PM_io_parser.h PM_io_parser::read_vertex() Face_of[] OOB read. An attacker can provide malicious input to trigger this vulnerability (CVE-2020-28601).

An oob read vulnerability exists in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sloop() slh->twin() An attacker can provide malicious input to trigger this vulnerability (CVE-2020-28636).

An oob read vulnerability exists in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sloop() slh->incident_sface. An attacker can provide malicious input to trigger this vulnerability (CVE-2020-35628).

An oob read vulnerability exists in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sface() sfh->volume(). An attacker can provide malicious input to trigger this vulnerability (CVE-2020-35636).

The cgal package has been updated to version 5.2.1, fixing the issues and other bugs. The openfoam and openscad packages have been rebuilt against the updated cgal library.

Record: MGASA-2021-0239
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`cgal` Debian:12	before 5.2-3	5.2-3
`cgal` Debian:13	before 5.2-3	5.2-3
`cgal` Debian:14	before 5.2-3	5.2-3
`cgal` Debian:9 From an advisory covering 45 CVEs	before 4.9-1+deb9u1, plus listed versions 4.9-1	4.9-1+deb9u1
`cgal` Debian:10 From an advisory covering 45 CVEs	before 4.13-1+deb10u1, plus listed versions 4.13-1	4.13-1+deb10u1
`cgal` Mageia:7 From an advisory covering 4 CVEs	before 4.14-1.1.mga7	4.14-1.1.mga7
`cgal` Mageia:8 From an advisory covering 4 CVEs	before 5.2.1-1.mga8	5.2.1-1.mga8
`openfoam` Mageia:8 From an advisory covering 4 CVEs	before 7-17.1.mga8	7-17.1.mga8
`openscad` Mageia:8 From an advisory covering 4 CVEs	before 2021.01-1.1.mga8	2021.01-1.1.mga8
`cgal` Ubuntu:14.04:LTS	All versions, plus listed versions 4.2-4ubuntu14.2-4ubuntu24.2-5ubuntu1	None known
`cgal` Ubuntu:16.04:LTS	All versions, plus listed versions 4.6.1-2ubuntu64.7-34.7-4	None known
`cgal` Ubuntu:18.04:LTS	All versions, plus listed versions 4.9-1build24.11-24.11-2build1	None known
`cgal` Ubuntu:20.04:LTS	All versions, plus listed versions 4.14-55.0.2-1ubuntu15.0.2-3	None known

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-28636 is a critical vulnerability (CVSS 10.0) in Cgal Computational Geometry Algorithms Library, published March 4, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.88%, the 86th percentile. Fixed in cgal 5.2-3.

References

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