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CVE-2019-20454

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

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 3.1 · 7.5 High EPSS 1.6% KEV · Not listed
Vendors
Fedoraproject Pcre Redhat and 1 more
Products
Fedora Pcre2 Enterprise Linux and 1 more
CVE-2019-20838

pcre: Buffer over-read in JIT when UTF is disabled and \X or \R has fixed quantifier greater than 1

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 · 7.5 High EPSS 2.8% KEV · Not listed
Vendors
Apple Pcre Redhat and 1 more
Products
Macos Pcre Enterprise Linux and 2 more
CVE-2026-103111

pcre2: pcre2: Out-of-bounds write via crafted regular expression

PCRE2 before 10.49, when there is an attacker-controlled regular expression and certain JIT API usage, allows an out-of-bounds write with arbitrary data.

CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Pcre
Products
Pcre2
CVE-2026-89157

pcre2: PCRE2: Out-of-bounds write via large pattern input

PCRE2 before 10.48, on 32-bit platforms, has a pcre2_pattern_convert out-of-bounds write when an attacker can provide a large pattern.

CVSS 3.1 · 5.7 Medium EPSS < 1% KEV · Not listed
Vendors
Pcre
Products
Pcre2
CVE-2026-89156

PCRE2: PCRE2: Out-of-bounds read via invalid UTF data during JIT fallback

PCRE2 before 10.48 has a pcre2_match out-of-bounds read after a JIT fallback when an attacker can provide invalid UTF data.

CVSS 3.1 · 2.9 Low EPSS < 1% KEV · Not listed
Vendors
Pcre
Products
Pcre2
CVE-2026-89158

PCRE2: PCRE2: Out-of-bounds write via integer overflow on 32-bit platforms

PCRE2 before 10.48, on 32-bit platforms, has a pcre2_compile_32 integer overflow and resultant out-of-bounds write.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Pcre
Products
Pcre2
CVE-2026-89160

pcre2: PCRE2: Denial of Service via out-of-bounds read during invalid UTF matching

PCRE2 before 10.48 has a pcre2_match out-of-bounds read during the PCRE2_MATCH_INVALID_UTF matching of an invalid UTF subject.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Pcre
Products
Pcre2
CVE-2026-89161

pcre2: PCRE2: Memory corruption vulnerability in pcre2_jit_match

In PCRE2 before 10.48, pcre2_jit_match mishandles a previously copied subject being passed in as a context. An incorrect free operation can occur.

CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
Vendors
Pcre
Products
Pcre2
CVE-2026-89162

pcre2: PCRE2: Information disclosure via pcre2_serialize_encode

In PCRE2 before 10.48, pcre2_serialize_encode might disclose two bytes to an adversary, typically in a situation where the access available to the adversary is already unsafe.

CVSS 3.1 · 2.9 Low EPSS < 1% KEV · Not listed
Vendors
Pcre
Products
Pcre2
CVE-2026-86145

pcre2: PCRE2: Out-of-bounds write allows arbitrary code execution via crafted regular expressions

PCRE2 before 10.48 allows a pcre2_dfa_match out-of-bounds write because reuse of a cached workspace block, in a recursive DFA matching workspace, lacks a size check (even though a newly allocated block, for the same purpose, does have a size check). This outcome requires an attacker-controlled regular expression, or a recursive pattern in conjunction with a small heap limit (this can be set through the API).

CVSS 3.1 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Pcre
Products
Pcre2
CVE-2008-2371

pcre: heap overflow caused by incorrect option handling

Heap-based buffer overflow in pcre_compile.c in the Perl-Compatible Regular Expression (PCRE) library 7.7 allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code via a regular expression that begins with an option and contains multiple branches.

CVSS 2.0 · 7.5 High EPSS 6.7% KEV · Not listed
Vendors
Canonical Debian Fedoraproject and 3 more
Products
Ubuntu Linux Debian Linux Fedora and 3 more
CVE-2006-7227

pcre integer overflow

Integer overflow in Perl-Compatible Regular Expression (PCRE) library before 6.7 allows context-dependent attackers to execute arbitrary code via a regular expression containing a large number of named subpatterns (name_count) or long subpattern names (max_name_size), which triggers a buffer overflow. NOTE: this issue was originally subsumed by CVE-2006-7224, but that CVE has been REJECTED and split.

CVSS 2.0 · 6.8 Medium EPSS 3.5% KEV · Not listed
Vendors
Pcre Redhat
Products
Pcre Enterprise Linux
CVE-2007-1660

pcre regular expression flaws

Perl-Compatible Regular Expression (PCRE) library before 7.0 does not properly calculate sizes for unspecified "multiple forms of character class", which triggers a buffer overflow that allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code.

CVSS 2.0 · 6.8 Medium EPSS 4.1% KEV · Not listed
Vendors
Pcre Redhat
Products
Pcre Enterprise Linux
CVE-2008-0674

pcre: buffer overflow via large UTF-8 character class

Buffer overflow in PCRE before 7.6 allows remote attackers to execute arbitrary code via a regular expression containing a character class with a large number of characters with Unicode code points greater than 255.

CVSS 2.0 · 7.5 High EPSS 5.9% KEV · Not listed
Vendors
Pcre
Products
Pcre
CVE-2007-4768

: pcre before 7.3 incorrect unicode in char class optimization

Heap-based buffer overflow in Perl-Compatible Regular Expression (PCRE) library before 7.3 allows context-dependent attackers to execute arbitrary code via a singleton Unicode sequence in a character class in a regex pattern, which is incorrectly optimized.

CVSS 2.0 · 6.8 Medium EPSS 4.1% KEV · Not listed
Vendors
Pcre Redhat
Products
Pcre Rhel Extras
CVE-2007-1659

pcre regular expression flaws

Perl-Compatible Regular Expression (PCRE) library before 7.3 allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via regex patterns containing unmatched "\Q\E" sequences with orphan "\E" codes.

CVSS 2.0 · 6.8 Medium EPSS 3.5% KEV · Not listed
Vendors
Pcre Redhat
Products
Pcre Enterprise Linux
CVE-2007-4767

: pcre < 7.3 \p, \P, \P{x] length calculation issue

Perl-Compatible Regular Expression (PCRE) library before 7.3 does not properly compute the length of (1) a \p sequence, (2) a \P sequence, or (3) a \P{x} sequence, which allows context-dependent attackers to cause a denial of service (infinite loop or crash) or execute arbitrary code.

CVSS 2.0 · 5.0 Medium EPSS 5.1% KEV · Not listed
Vendors
Pcre
Products
Pcre
CVE-2007-4766

: pcre < 7.3 integer overflows

Multiple integer overflows in Perl-Compatible Regular Expression (PCRE) library before 7.3 allow context-dependent attackers to cause a denial of service (crash) or execute arbitrary code via unspecified escape (backslash) sequences.

CVSS 2.0 · 7.5 High EPSS 4.2% KEV · Not listed
Vendors
Pcre
Products
Pcre
CVE-2006-7230

pcre miscalculation of memory requirements if options are changed during pattern compilation

Perl-Compatible Regular Expression (PCRE) library before 7.0 does not properly calculate the amount of memory needed for a compiled regular expression pattern when the (1) -x or (2) -i UTF-8 options change within the pattern, which allows context-dependent attackers to cause a denial of service (PCRE or glibc crash) via crafted regular expressions.

CVSS 2.0 · 4.3 Medium EPSS 1.7% KEV · Not listed
Vendors
Pcre Redhat
Products
Pcre Enterprise Linux