CVE-2019-20454
highAn 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.
Vendor / product: Pcre — pcre2
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.
CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2020-02-14 14:15
Modified: 2026-11-02 18:18
NVD status: Modified
Last synced 1 day ago
Verified against the source API 2026-11-03 07:33 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
pcre / pcre2 ≥10.31 <10.34
fedoraproject / fedora 31
splunk / universal_forwarder ≥8.2.0 <8.2.12, ≥9.0.0 <9.0.6, 9.1.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=1735494
Patch / mitigation: https://vcs.pcre.org/pcre2?view=revision&revision=1092
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=1735494
Patch / mitigation: https://vcs.pcre.org/pcre2?view=revision&revision=1092
References
- https://bugs.exim.org/show_bug.cgi?id=2421 cve@mitre.org
- https://bugs.php.net/bug.php?id=78338 cve@mitre.org
- https://bugzilla.redhat.com/show_bug.cgi?id=1735494 cve@mitre.org
- https://lists.debian.org/debian-lts-announce/2023/03/msg00014.html cve@mitre.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... cve@mitre.org
- https://security.gentoo.org/glsa/202006-16 cve@mitre.org
- https://vcs.pcre.org/pcre2?view=revision&revision=1092 cve@mitre.org
- https://bugs.exim.org/show_bug.cgi?id=2421 af854a3a-2127-422b-91ae-364da2661108
- https://bugs.php.net/bug.php?id=78338 af854a3a-2127-422b-91ae-364da2661108
- https://bugzilla.redhat.com/show_bug.cgi?id=1735494 af854a3a-2127-422b-91ae-364da2661108
- https://lists.debian.org/debian-lts-announce/2023/03/msg00014.html af854a3a-2127-422b-91ae-364da2661108
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... af854a3a-2127-422b-91ae-364da2661108
- https://security.gentoo.org/glsa/202006-16 af854a3a-2127-422b-91ae-364da2661108
- https://vcs.pcre.org/pcre2?view=revision&revision=1092 af854a3a-2127-422b-91ae-364da2661108
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:33 UTC · record ↗