Vulnerability Details : CVE-2022-39209
cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior to 0.29.0.gfm.6 a polynomial time complexity issue in cmark-gfm's autolink extension may lead to unbounded resource exhaustion and subsequent denial of service. Users may verify the patch by running `python3 -c 'print("![l"* 100000 + "\n")' | ./cmark-gfm -e autolink`, which will resource exhaust on unpatched cmark-gfm but render correctly on patched cmark-gfm. This vulnerability has been patched in 0.29.0.gfm.6. Users are advised to upgrade. Users unable to upgrade should disable the use of the autolink extension.
Vulnerability category: Denial of service
Products affected by CVE-2022-39209
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
- cpe:2.3:a:github:cmark-gfm:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2022-39209
1.19%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 78 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2022-39209
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
2.8
|
3.6
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
GitHub, Inc. |
CWE ids for CVE-2022-39209
-
The product does not properly control the allocation and maintenance of a limited resource.Assigned by:
- nvd@nist.gov (Primary)
- security-advisories@github.com (Secondary)
-
An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.Assigned by: nvd@nist.gov (Primary)
References for CVE-2022-39209
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UEAAAI4OULDYQ2TA3HOXH54PC3DCBFZS/
[SECURITY] Fedora 37 Update: ghc-cmark-gfm-0.2.5-1.fc37 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://github.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7q
Unbounded resource exhaustion may lead to denial of service · Advisory · github/cmark-gfm · GitHubThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JIUCZN3PEKUCT2JQYQTYOVIJG2KSD6G7/
[SECURITY] Fedora 35 Update: ghc-cmark-gfm-0.2.5-1.fc35 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://github.com/github/cmark-gfm/commit/9d57d8a23142b316282bdfc954cb0ecda40a8655
Merge pull request from GHSA-cgh3-p57x-9q7q · github/cmark-gfm@9d57d8a · GitHubPatch;Third Party Advisory
-
https://en.wikipedia.org/wiki/Time_complexity
Time complexity - WikipediaThird Party Advisory
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JMGP65NANDVKPDMXMKYO2ZV2H2HZJY4P/
[SECURITY] Fedora 36 Update: ghc-cmark-gfm-0.2.5-1.fc36 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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