CVE-2012-1109: mwlib 0.13 through 0.13.4 has a denial of service vulnerability when parsing #iferror magic functions

Q: How do I fix CVE-2012-1109?

mwlib: upgrade to newer than 0.13.4. Exact commands for each OS are on this page.

Q: Is CVE-2012-1109 being exploited?

CVE-2012-1109 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2012-1109 affect?

CVE-2012-1109 affects mwlib. Severity is high (CVSS 7.5). mwlib 0.13 through 0.13.4 has a denial of service vulnerability when parsing #iferror magic functions

Q: How urgent is CVE-2012-1109?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2012-1109 is a high-severity flaw (CVSS 7.5) affecting mwlib. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mwlib 0.13 through 0.13.4 has a denial of service vulnerability when parsing #iferror magic functions

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-755
Published	2019-11-12
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: pediapress

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-11-12 15:15 UTCPublished CVE record published
2026-06-16 23:39 UTCUpdated Record last modified

pediapress mwlib UPGRADE

Affected: <= 0.13.4

Fixed in: newer than 0.13.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.13.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mwlib

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mwlib

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2012-1109?

mwlib: upgrade to newer than 0.13.4. Exact commands for each OS are on this page.

Is CVE-2012-1109 being exploited?

CVE-2012-1109 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-2012-1109 affect?

CVE-2012-1109 affects mwlib. Severity is high (CVSS 7.5). mwlib 0.13 through 0.13.4 has a denial of service vulnerability when parsing #iferror magic functions

How urgent is CVE-2012-1109?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

References

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