How severe is CVE-2009-4134?

CVE-2009-4134 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-4134 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4134?

CVE-2009-4134 affects Python. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-4134?

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

When was CVE-2009-4134 published?

CVE-2009-4134 was published on 2010-05-27 and last updated on 2026-06-16.

CVE-2009-4134

CVE-2009-4134 is a medium-severity vulnerability in Python 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-787.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Python
Published: 2010-05-27
Last modified: 2026-06-16

Description

Buffer underflow in the rgbimg module in Python 2.5 allows remote attackers to cause a denial of service (application crash) via a large ZSIZE value in a black-and-white (aka B/W) RGB image that triggers an invalid pointer dereference.

Frequently asked questions

What is CVE-2009-4134?: Buffer underflow in the rgbimg module in Python 2.5 allows remote attackers to cause a denial of service (application crash) via a large ZSIZE value in a black-and-white (aka B/W) RGB image that triggers an invalid pointer dereference.
How severe is CVE-2009-4134?: CVE-2009-4134 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-4134 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4134?: CVE-2009-4134 affects Python. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-4134?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4134 published?: CVE-2009-4134 was published on 2010-05-27 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:python:python:2.5.0:*:*:*:*:*:*:*

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