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Public proof of conceptFix available

CVE-2020-35636

A public proof of concept exists; no exploitation attested.

  • Published2021-03-04
  • WeaknessCWE-125 · CWE-129 · CWE-843

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A code execution vulnerability exists in the Nef polygon-parsing functionality of CGAL libcgal CGAL-5.1.1 in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sface() sfh->volume() OOB read. A specially crafted malformed file can lead to an out-of-bounds read and type confusion, which could lead to code execution. An attacker can provide malicious input to trigger this vulnerability.

Timeline

dates in UTC
  1. 2021-03-0420:15CVE publishedNVD

Versions per branch

NVD
Cgal computational geometry algorithms library
BranchAffectedFixed in
5.1= 5.1.1no fix published
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As talos, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • CGAL Project
    Affected
    • = CGAL Project libcgal CGAL-5.1.1no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-05-30

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • cgalUbuntu:20.04:LTSall versions · no fixed version listed
  • cgalUbuntu:18.04:LTSall versions · no fixed version listed
  • cgalUbuntu:16.04:LTSall versions · no fixed version listed
  • cgalUbuntu:14.04:LTSall versions · no fixed version listed
  • cgalMageia:8all versions · fixed in 5.2.1-1.mga8
  • cgalMageia:7all versions · fixed in 4.14-1.1.mga7
  • cgalDebian:14all versions · fixed in 5.2-3
  • cgalDebian:13all versions · fixed in 5.2-3

5 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-35636 Red Hat Product Security

    CGAL: code execution vulnerability may lead to oob read

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2025-04-23
  • NVDCVSS 3.19.8read 2026-10-23
  • CNACVSS 3.010known since 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-129known since 2026-10-23
  • NVDweakness (CWE)CWE-125, CWE-843read 2026-10-23
  • FIRST EPSSEPSS score3.3 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-03-04
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-7jvh-xr76-gqq7

Frequently asked questions

What is CVE-2020-35636?

A code execution vulnerability exists in the Nef polygon-parsing functionality of CGAL libcgal CGAL-5.1.1 in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sface() sfh->volume() OOB read. A specially crafted malformed file can lead to an out-of-bounds read and type confusion, which could lead to code execution. An attacker can provide malicious input to trigger this vulnerability.

Is CVE-2020-35636 actively exploited?

A proof-of-concept exploit exists for CVE-2020-35636, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2020-35636?

CVE-2020-35636 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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