CVE catalog

CVE-2021-40978

python-mkdocs: CVE-2021-40978

Severity: Low
Published: Oct 7, 2021, 2:15:08 PM UTC
Source: [NVD] · [CVE record]
EPSS: 15.10% · Oct 25, 2026

The mkdocs 1.2.2 built-in dev-server allows directory traversal using the port 8000, enabling remote exploitation to obtain :sensitive information. NOTE: the vendor has disputed this as described in https://github.com/mkdocs/mkdocs/issues/2601.] and https://github.com/nisdn/CVE-2021-40978/issues/1

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	python-mkdocs	sid	`1.6.1+dfsg1-5`	vulnerable
Debian	python-mkdocs	forky	`1.6.1+dfsg1-5`	vulnerable
Debian	python-mkdocs	trixie	`1.6.1+dfsg1-2`	vulnerable
Debian	python-mkdocs	bookworm	`1.4.2+dfsg-2`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	python-mkdocs	source	sid	`(unfixed)`	unimportant	Not reported	Not reported
Debian	python-mkdocs	source	forky	`(unfixed)`	unimportant	Not reported	Not reported
Debian	python-mkdocs	source	trixie	`(unfixed)`	unimportant	Not reported	Not reported
Debian	python-mkdocs	source	bookworm	`(unfixed)`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[mkdocs]Affected
Source package: [python-mkdocs]
Details (2)
- 1.4.2+dfsg-2 · all · bookworm
  Affected
  dsa · python-mkdocs · debian · bookworm; dsa · python-mkdocs · debian · 12
- 1.4.2+dfsg-2 · all · bookworm
  Affected
  dsa · python-mkdocs · debian · bookworm; dsa · python-mkdocs · debian · 12
[mkdocs-doc]Affected
Source package: [python-mkdocs]
Details (2)
- 1.4.2+dfsg-2 · all · bookworm
  Affected
  dsa · python-mkdocs · debian · bookworm; dsa · python-mkdocs · debian · 12
- 1.4.2+dfsg-2 · all · bookworm
  Affected
  dsa · python-mkdocs · debian · bookworm; dsa · python-mkdocs · debian · 12

[Debian 13 (Trixie)]

[mkdocs]Affected
Source package: [python-mkdocs]
Details (2)
- 1.6.1+dfsg1-2 · all · trixie
  Affected
  dsa · python-mkdocs · debian · 13
- 1.6.1+dfsg1-2 · all · trixie
  Affected
  dsa · python-mkdocs · debian · 13
[mkdocs-doc]Affected
Source package: [python-mkdocs]
Details (2)
- 1.6.1+dfsg1-2 · all · trixie
  Affected
  dsa · python-mkdocs · debian · 13
- 1.6.1+dfsg1-2 · all · trixie
  Affected
  dsa · python-mkdocs · debian · 13

Observed: Oct 23, 2026, 6:02:35 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]