CVE-2021-26813
low
CVSS v3
—
CVSS v2
—
VIR risk
2.5
Description
markdown2 >=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-26813
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 2.4.0-1 | |
| debian | bookworm | fixed | 2.3.10-1.1 |
| debian | bullseye | fixed | 2.3.10-1.1 |
| debian | forky | fixed | 2.3.10-1.1 |
| debian | sid | fixed | 2.3.10-1.1 |
| debian | trixie | fixed | 2.3.10-1.1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| PyPI | markdown2 | >=1.0.1.18,<2.4.0 | 2.4.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-26813
- https://github.com/trentm/python-markdown2/pull/387
- https://github.com/trentm/python-markdown2/commit/7b651260739647de5198323e0445b1618750c374
- https://github.com/advisories/GHSA-jr9p-r423-9m2r
- https://github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2021-20.yaml
- https://github.com/trentm/python-markdown2
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH/
- https://security-tracker.debian.org/tracker/CVE-2021-26813
Verify integrity in audit chain (admin only). AS-IS.