CVE-2022-34913: md2roff 1.7 has a stack-based buffer overflow via a Markdown file containing a large number of consecutive cha

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2022-34913 is a critical-severity flaw (CVSS 9.8) affecting md2roff. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

md2roff 1.7 has a stack-based buffer overflow via a Markdown file containing a large number of consecutive characters to be processed. NOTE: the vendor's position is that the product is not intended for untrusted input

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-787
Published	2022-07-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: md2roff project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-07-02 20:15 UTCPublished CVE record published
2026-06-17 04:51 UTCUpdated Record last modified

md2roff project md2roff DOWNGRADE

Affected: 1.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7

1. Check installed version

apt-cache policy md2roff || rpm -q md2roff || md2roff --version

2. No fixed release: DOWNGRADE to a release before 1.7 (Debian / Ubuntu)

apt-cache madison md2roff sudo apt install md2roff=<VERSION_BEFORE_1.7> sudo apt-mark hold md2roff

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list md2roff sudo dnf downgrade md2roff-<VERSION_BEFORE_1.7> sudo dnf versionlock add md2roff

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-34913?

md2roff: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-34913 being exploited?

CVE-2022-34913 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-34913 affect?

CVE-2022-34913 affects md2roff. Severity is critical (CVSS 9.8). md2roff 1.7 has a stack-based buffer overflow via a Markdown file containing a large number of consecutive characters to be processed. NOTE: the vendor's position is that the product is not intended for untrusted input

How urgent is CVE-2022-34913?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-41220 CRITICAL 9.8 DOWNGRADE md2roff 1.9 has a stack-based buffer overflow via a Markdown file, a different vulnerability than CVE-2022-349

References

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