How severe is CVE-2010-1330?

CVE-2010-1330 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2010-1330 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-1330?

CVE-2010-1330 primarily affects Jruby. In total, 35 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-1330?

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

When was CVE-2010-1330 published?

CVE-2010-1330 was published on 2012-11-23 and last updated on 2026-06-16.

CVE-2010-1330

CVE-2010-1330 is a medium-severity vulnerability in Jruby with a CVSS 2.0 base score of 4.3. 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-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Jruby
Published: 2012-11-23
Last modified: 2026-06-16

Description

The regular expression engine in JRuby before 1.4.1, when $KCODE is set to 'u', does not properly handle characters immediately after a UTF-8 character, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a crafted string.

Frequently asked questions

What is CVE-2010-1330?: The regular expression engine in JRuby before 1.4.1, when $KCODE is set to 'u', does not properly handle characters immediately after a UTF-8 character, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a crafted string.
How severe is CVE-2010-1330?: CVE-2010-1330 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2010-1330 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-1330?: CVE-2010-1330 primarily affects Jruby. In total, 35 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-1330?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2010-1330 published?: CVE-2010-1330 was published on 2012-11-23 and last updated on 2026-06-16.

References

Affected products (35)

cpe:2.3:a:jruby:jruby:*:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:0.9.0:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:0.9.1:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:0.9.2:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:0.9.8:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:0.9.9:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.0.0:rc3:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1:beta1:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1:rc1:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1:rc2:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1:rc3:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1.3:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1.4:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1.5:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1.6:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.1.6:rc1:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.2.0:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.2.0:rc2:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.3.0:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.3.0:rc1:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.3.0:rc2:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.3.1:*:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.4.0:rc1:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.4.0:rc2:*:*:*:*:*:*
cpe:2.3:a:jruby:jruby:1.4.0:rc3:*:*:*:*:*:*

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