CVE-2021-26813

low

Published 2021-06-02 · Modified 2023-11-08

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

—

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4 NEW

—

not yet in upstream

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

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`2.4.0-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`2.3.10-1.1`
sid	Fixed	`2.3.10-1.1`
forky	Fixed	`2.3.10-1.1`
bullseye	Fixed	`2.3.10-1.1`
bookworm	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

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.