Vulnerability database
Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.
6 results
Oct 28, 2026python-markdown2 through 2.5.5 contains a denial of service vulnerability that allows remote users to exhaust CPU by submitting Markdown with unclosed inline liCVE-2026-118694 · Other software · trentm · reported by VulnCheckHigh 8.7
python-markdown2 through 2.5.5 contains a denial of service vulnerability that allows remote users to exhaust CPU by submitting Markdown with unclosed inline link destinations. Attackers can submit repeated '[a](' or ' in the Markdown2.CVE-2026-88753 · Other software · reported by MITREHigh 7.5
A Regular-Expression Denial of Service (ReDoS) in the Markdown2. extract_metadata() function (lib/markdown2.py) of trentm markdown2 through v2.5.5 allows attackers to cause a Denial of Service (DoS) via a crafted Markdown document.
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgist.github.comgist.github.com
Mar 3, 2021markdown2 >=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability.CVE-2021-26813 · Other software · Markdown2 Project · reported by MITREHigh 7.5
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.
- Product
- Markdown2
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comlists.fedoraproject.org
Apr 20, 2020python-markdown2 through 2.3.8 allows XSS because element names are mishandled unless a \w+ match succeeds.CVE-2020-11888 · Other software · Python-markdown2 Project · reported by MITREMedium 6.1
python-markdown2 through 2.3.8 allows XSS because element names are mishandled unless a \w+ match succeeds. For example, an attack might use elementname@ or elementname- with an onclick attribute.
- Product
- Python-markdown2
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordlists.opensuse.orglists.opensuse.org
Jan 15, 2020python-markdown2 before 1.0.1.14 has multiple cross-site scripting (XSS) issues.CVE-2009-3724 · Other software · python-markdown2 · reported by Red HatMedium 6.1
python-markdown2 before 1.0.1.14 has multiple cross-site scripting (XSS) issues.
- Product
- python-markdown2
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jan 18, 2018An issue was discovered in markdown2 (aka python-markdown2) through 2.3.5.CVE-2018-5773 · Other software · Python-markdown2 Project · reported by MITREMedium 6.1
An issue was discovered in markdown2 (aka python-markdown2) through 2.3.5. The safe_mode feature, which is supposed to sanitize user input against XSS, is flawed and does not escape the input properly. With a crafted payload, XSS can be triggered, as demonstrated by omitting the final '>' character from an IMG tag.
- Product
- Python-markdown2
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.
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