CVE-2009-3826

CVE-2009-3826 is a medium-severity vulnerability in Squidguard 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-119.

Key facts

Description

Multiple buffer overflows in squidGuard 1.4 allow remote attackers to bypass intended URL blocking via a long URL, related to (1) the relationship between a certain buffer size in squidGuard and a certain buffer size in Squid and (2) a redirect URL that contains information about the originally requested URL.

Frequently asked questions

What is CVE-2009-3826?
Multiple buffer overflows in squidGuard 1.4 allow remote attackers to bypass intended URL blocking via a long URL, related to (1) the relationship between a certain buffer size in squidGuard and a certain buffer size in Squid and (2) a redirect URL that contains information about the originally requested URL.
How severe is CVE-2009-3826?
CVE-2009-3826 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-3826 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3826?
CVE-2009-3826 affects Squidguard. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-3826?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-3826 published?
CVE-2009-3826 was published on 2009-10-28 and last updated on 2026-06-16.

References

Affected products (1)

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