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Vulnerability record · CVE-2019-20838 · published 15 June 2020

CVE-2019-20838: Pcre out-of-bounds read vulnerability

Pcre · Pcre

libpcre in PCRE before 8.43 allows a subject buffer over-read in JIT when UTF is disabled, and \X or \R has more than one fixed quantifier, a related issue to CVE-2019-20454.

7.5 CVSS 3.1 High EPSS 2.8% · top 14.3% CWE-125 · Out-of-bounds read
7.5CVSS 3.1 base score, v2 4.3
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

libpcre in PCRE before 8.43 allows a subject buffer over-read in JIT when UTF is disabled, and \X or \R has more than one fixed quantifier, a related issue to CVE-2019-20454.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://seclists.org/fulldisclosure/2020/Dec/32 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2021/Feb/14 Mailing ListThird Party Advisory
https://bugs.gentoo.org/717920 Issue TrackingPatchThird Party AdvisoryVDB Entry
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org% Mailing ListThird Party Advisory
https://support.apple.com/kb/HT211931 Vendor Advisory
https://support.apple.com/kb/HT212147 Vendor Advisory
https://www.pcre.org/original/changelog.txt Release NotesVendor Advisory
http://seclists.org/fulldisclosure/2020/Dec/32 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2021/Feb/14 Mailing ListThird Party Advisory
https://bugs.gentoo.org/717920 Issue TrackingPatchThird Party AdvisoryVDB Entry
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org% Mailing ListThird Party Advisory
https://support.apple.com/kb/HT211931 Vendor Advisory
https://support.apple.com/kb/HT212147 Vendor Advisory
https://www.pcre.org/original/changelog.txt Release NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-20838), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.