GHSA-wrxv-2j5q-m38w

Suggest an improvement
Source
https://github.com/advisories/GHSA-wrxv-2j5q-m38w
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/07/GHSA-wrxv-2j5q-m38w/GHSA-wrxv-2j5q-m38w.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-wrxv-2j5q-m38w
Aliases
Published
2022-07-06T00:00:30Z
Modified
2024-09-30T20:25:53.619764Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
lxml NULL Pointer Dereference allows attackers to cause a denial of service
Details

NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.

Database specific 
{
    "nvd_published_at": "2022-07-05T10:15:00Z",
    "cwe_ids": [
        "CWE-476"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2022-07-06T19:14:23Z"
}
References

Affected packages

PyPI / lxml

Package

Name
lxml
View open source insights on deps.dev
Purl
pkg:pypi/lxml

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.9.1

Affected versions

1.*

1.3.2
1.3.3
1.3.4
1.3.5
1.3.6

2.*

2.0
2.0.4
2.0.5
2.0.6
2.0.7
2.0.8
2.0.9
2.0.10
2.0.11
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.2.8
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6

3.*

3.0
3.0.2
3.1.0
3.1.1
3.1.2
3.2.0
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.3.0
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.4.0
3.4.1
3.4.2
3.4.3
3.4.4
3.5.0
3.6.0
3.6.1
3.6.2
3.6.3
3.6.4
3.7.0
3.7.1
3.7.2
3.7.3
3.8.0

4.*

4.0.0
4.1.0
4.1.1
4.2.0
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.3.0
4.3.2
4.3.3
4.3.4
4.3.5
4.4.0
4.4.1
4.4.2
4.4.3
4.5.0
4.5.1
4.5.2
4.6.0
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.1
4.8.0
4.9.0