Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2019-20838

CVE-2019-20838HIGH

n/a n/a — 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 quantifie…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0277   86.1     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Jun 15  Reserved by mitre
  Jun 15  Published (CNA: mitre)
  Oct 8   ENRICHED — CVE-2019-20838. Received CVSS 7.5 and CPE data from NVD.

CWE-125 · CNA: mitre · CVSS v3.1 · 7 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 15, 2020	Reserved	Reserved by mitre
June 15, 2020	Published	Published (CNA: mitre)
October 8, 2026	ENRICHED	ENRICHED — CVE-2019-20838. Received CVSS 7.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-125

References (7)

http://seclists.org/fulldisclosure/2020/Dec/32 [Mailing List, Third Party Advisory]
http://seclists.org/fulldisclosure/2021/Feb/14 [Mailing List, Third Party Advisory]
https://bugs.gentoo.org/717920 [Issue Tracking, Patch, Third Party Advisory, VDB Entry]
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E [Mailing List, Third 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 Notes, Vendor Advisory]

Authoritative record: CVE-2019-20838 at cve.org

Weaknesses: CWE-125

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2019-20838 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.