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No exploitation reportedFix available

CVE-2018-5773

No exploitation reported by the sources we read.

  • Published2018-01-18
  • Fixed in2.3.6
  • WeaknessCWE-79

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

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.

Timeline

dates in UTC
  1. 2018-01-1821:29CVE publishedNVD

Versions per branch

OSV · NVD
markdown2
BranchAffectedFixed in
2.3< 2.3.62.3.6
Python-markdown2 project python-markdown2
BranchAffectedFixed in
2.3≤ 2.3.5no fix published

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

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

  • python-markdown2openSUSE:Tumbleweedall versions · fixed in 2.4.13-1.2
  • python-markdown2openSUSE:Tumbleweedall versions · fixed in 2.4.0-2.4
  • python-markdown2openSUSE:Tumbleweedall versions · fixed in 2.5.5-1.3

Full record on NVD

Fix

  1. Update markdown2 to 2.3.6

Detection

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

Sources

  • NVDCVSS 3.06.1read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • NVDweakness (CWE)CWE-79read 2026-10-23
  • FIRST EPSSEPSS score0.8 %2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2020-06-16

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
2018-01-18
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-p6h9-gw49-rqm4

Frequently asked questions

What is CVE-2018-5773?

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.

Is CVE-2018-5773 actively exploited?

Active exploitation of CVE-2018-5773 has not been confirmed. Its EPSS score was 0.8% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-5773?

CVE-2018-5773 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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