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Fencer Vulns
medium 5.1

CVE-2019-20454 json

An out-of-bounds read was discovered in PCRE before 10.34 when the pattern \X is JIT compiled and used to match specially crafted subjects…

published 2020-02-14 6 y ago modified 2026-11-02 6 d ago also EUVD-2019-11000

cvss
5.1
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

An out-of-bounds read was discovered in PCRE before 10.34 when the pattern \X is JIT compiled and used to match specially crafted subjects in non-UTF mode. Applications that use PCRE to parse untrusted input may be vulnerable to this flaw, which would allow an attacker to crash the application. The flaw occurs in do_extuni_no_utf in pcre2_jit_compile.c.

Patch / fix

  • pcre pcre2 10.34
  • splunk universal_forwarder 8.2.12, 9.0.6
  • pcre2 Debian 14, Debian 13, Debian 12 10.34-1

debian advisories DEBIAN-CVE-2019-20454

  • php RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
  • libzip RHEL 8 1.5.2-1.module+el8.1.0+3189+a1bff096
  • php-gd RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
  • php-cli RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
  • php-dba RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
  • php-dbg RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
  • php-fpm RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
  • php-gmp RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef

red hat advisories RHSA-2020:3662RHSA-2020:4539

  • pcre2 SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +20 more 10.31-150000.3.12.1

suse advisories SUSE-SU-2022:2649-1

  • pcre2 openSUSE Leap Micro 5.2 10.31-150000.3.12.1

opensuse advisories openSUSE-SU-2022:2649-1

  • pcre2 AlmaLinux 8 10.32-2.el8
  • pcre2-tools AlmaLinux 8 10.32-2.el8
  • pcre2-utf16 AlmaLinux 8 10.32-2.el8
  • pcre2-utf32 AlmaLinux 8 10.32-2.el8
  • php AlmaLinux 8 7.3.20-1.module_el8.4.0+2229+b272fdef
  • php AlmaLinux 8 7.3.20-1.module_el8.5.0+152+112d3b8c
  • php AlmaLinux 8 7.3.20-1.module_el8.3.0+2009+b272fdef
  • libzip AlmaLinux 8 1.5.2-1.module_el8.5.0+152+112d3b8c

almalinux advisories ALSA-2020:4539ALSA-2020:3662

  • pcre2 Rocky Linux 8 10.32-2.el8
  • php Rocky Linux 8 7.3.20-1.module+el8.4.0+414+2e7afcdd
  • libzip Rocky Linux 8 1.5.2-1.module+el8.4.0+414+2e7afcdd
  • php-pear Rocky Linux 8 1:1.10.9-1.module+el8.4.0+414+2e7afcdd
  • php-pecl-rrd Rocky Linux 8 2.0.1-1.module+el8.4.0+414+2e7afcdd
  • php-pecl-zip Rocky Linux 8 1.15.4-1.module+el8.4.0+414+2e7afcdd
  • php-pecl-apcu Rocky Linux 8 5.1.17-1.module+el8.4.0+414+2e7afcdd
  • php-pecl-xdebug Rocky Linux 8 2.8.0-1.module+el8.4.0+414+2e7afcdd

rocky linux advisories RLSA-2020:4539RLSA-2020:3662

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-20454 updated cvss 7.5

pcre: Out of bounds read in JIT mode when \X is used in non-UTF mode

  • Red Hat Enterprise Linux 5 pcre Red Hat Enterprise Linux 6 pcre, glib2, firefox, thunderbird, chromium-browser Red Hat JBoss Enterprise Web Server 1 httpd Red Hat JBoss Enterprise Web Server 2 jbcs-httpd24, jbcs-httpd24-runtime Red Hat JBoss Web Server 3 pcre, httpd24 httpd24
    affected: no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) pcre2-tools 10.32-2.el8
    fixed: vendor fix RHSA-2020:4539
  • Red Hat Enterprise Linux AppStream (v. 8) php 7.3.20-1.module+el8.2.0+7373+b272fdef, libzip 1.5.2-1.module+el8.1.0+3189+a1bff096, php-gd 7.3.20-1.module+el8.2.0+7373+b272fdef, php-cli 7.3.20-1.module+el8.2.0+7373+b272fdef, php-dba 7.3.20-1.module+el8.2.0+7373+b272fdef, php-dbg 7.3.20-1.module+el8.2.0+7373+b272fdef, +28 more
    fixed: vendor fix RHSA-2020:3662
  • Red Hat Enterprise Linux BaseOS (v. 8) pcre2 10.32-2.el8, pcre2-utf16 10.32-2.el8, pcre2-utf32 10.32-2.el8
    fixed: vendor fix RHSA-2020:4539
  • Red Hat Enterprise Linux 7 pcre, glib2, pcre2, glib2-fam, pcre-tools, glib2-tests, +5 more Red Hat Enterprise Linux 8 php, pcre, libzip, php-gd, php-cli, php-dba, +34 more Red Hat JBoss Core Services jbcs-httpd24-httpd Red Hat Software Collections rh-php72-php, rh-php73-php, rh-php72-php-gd, rh-php73-php-gd, rh-php72-php-cli, rh-php72-php-dba, +87 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 d ago

Exploit prediction

1.56% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.php.net https://bugs.php.net/bug.php?id=78338 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 5.1 CVSS:3.0/AC:H/AV:L/A:H/C:N/I:N/PR:N/S:U/UI:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.0 5.1 CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.