How severe is CVE-2011-1156?

CVE-2011-1156 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-1156 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1156?

CVE-2011-1156 primarily affects Mark Pilgrim Feedparser. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1156?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-1156 published?

CVE-2011-1156 was published on 2011-04-11 and last updated on 2026-06-16.

CVE-2011-1156

CVE-2011-1156 is a medium-severity vulnerability in Mark Pilgrim Feedparser with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Mark Pilgrim Feedparser
Published: 2011-04-11
Last modified: 2026-06-16

Description

feedparser.py in Universal Feed Parser (aka feedparser or python-feedparser) before 5.0.1 allows remote attackers to cause a denial of service (application crash) via a malformed DOCTYPE declaration.

Frequently asked questions

What is CVE-2011-1156?: feedparser.py in Universal Feed Parser (aka feedparser or python-feedparser) before 5.0.1 allows remote attackers to cause a denial of service (application crash) via a malformed DOCTYPE declaration.
How severe is CVE-2011-1156?: CVE-2011-1156 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-1156 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1156?: CVE-2011-1156 primarily affects Mark Pilgrim Feedparser. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1156?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1156 published?: CVE-2011-1156 was published on 2011-04-11 and last updated on 2026-06-16.

References

Affected products (10)

cpe:2.3:a:mark_pilgrim:feedparser:*:*:*:*:*:*:*:*
cpe:2.3:a:mark_pilgrim:feedparser:3.0:*:*:*:*:*:*:*
cpe:2.3:a:mark_pilgrim:feedparser:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mark_pilgrim:feedparser:3.1:*:*:*:*:*:*:*
cpe:2.3:a:mark_pilgrim:feedparser:3.2:*:*:*:*:*:*:*
cpe:2.3:a:mark_pilgrim:feedparser:3.3:*:*:*:*:*:*:*
cpe:2.3:a:mark_pilgrim:feedparser:4.0:*:*:*:*:*:*:*
cpe:2.3:a:mark_pilgrim:feedparser:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mark_pilgrim:feedparser:4.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mark_pilgrim:feedparser:4.1:*:*:*:*:*:*:*

More vulnerabilities in Mark Pilgrim Feedparser

CVE-2012-2921 — Medium (CVSS 5.0): Universal Feed Parser (aka feedparser or python-feedparser) before 5.1.2 allows remote attackers to cause a denial of…
CVE-2011-1158 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in feedparser.py in Universal Feed Parser (aka feedparser or…
CVE-2011-1157 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in feedparser.py in Universal Feed Parser (aka feedparser or…
CVE-2009-5065 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in feedparser.py in Universal Feed Parser (aka feedparser or…

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Other CWE-399 (Resource Management Errors) vulnerabilities

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CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

Browse all CWE-399 (Resource Management Errors) vulnerabilities →