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-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-2025-58050

PCRE2: heap-buffer-overflow read in match_ref due to missing boundary restoration in SCS

The PCRE2 library is a set of C functions that implement regular expression pattern matching. In version 10.45, a heap-buffer-overflow read vulnerability exists in the PCRE2 regular expression matching engine, specifically within the handling of the (*scs:...) (Scan SubString) verb when combined with (*ACCEPT) in src/pcre2_match.c. This vulnerability may potentially lead to information disclosure if the out-of-bounds data read during the memcmp affects the final match result in a way observable by the attacker. This issue has been resolved in version 10.46.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Pcre

Products

Pcre2

CVE-2017-7186

pcre: Invalid Unicode property lookup (8.41/7, 10.24/2)

libpcre1 in PCRE 8.40 and libpcre2 in PCRE2 10.23 allow remote attackers to cause a denial of service (segmentation violation for read access, and application crash) by triggering an invalid Unicode property lookup.

CVSS 3.0 · 7.5 High EPSS 5.0% KEV · Not listed

Vendors

Pcre Redhat

Products

Pcre Pcre2 Jboss Core Services

CVE-2017-8786

pcre2: Heap-based buffer overflow in pcre2test.c

pcre2test.c in PCRE2 10.23 allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact via a crafted regular expression.

CVSS 3.0 · 9.8 Critical EPSS 4.1% KEV · Not listed

Vendors

Pcre

Products

Pcre2

CVE-2017-8399

pcre2: Stack-based buffer overflow in pcre2_match.c

PCRE2 before 10.30 has an out-of-bounds write caused by a stack-based buffer overflow in pcre2_match.c, related to a "pattern with very many captures."

CVSS 3.0 · 9.8 Critical EPSS 3.1% KEV · Not listed

Vendors

Pcre

Products

Pcre2

CVE-2015-3210

pcre: buffer overflow caused by recursive back reference by name within certain group (8.38/4)

Heap-based buffer overflow in PCRE 8.34 through 8.37 and PCRE2 10.10 allows remote attackers to execute arbitrary code via a crafted regular expression, as demonstrated by /^(?P=B)((?P=B)(?J:(?P<B>c)(?P<B>a(?P=B)))>WGXCREDITS)/, a different vulnerability than CVE-2015-8384.

CVSS 3.1 · 9.8 Critical EPSS 9.2% KEV · Not listed

Vendors

Pcre Redhat

Products

Pcre Pcre2 Rhel Software Collections

CVE-2015-3217

pcre: stack overflow caused by mishandled group empty match (8.38/11)

PCRE 7.8 and 8.32 through 8.37, and PCRE2 10.10 mishandle group empty matches, which might allow remote attackers to cause a denial of service (stack-based buffer overflow) via a crafted regular expression, as demonstrated by /^(?:(?(1)\\.|([^\\\\W_])?)+)+$/.

CVSS 3.0 · 7.5 High EPSS 6.2% KEV · Not listed

Vendors

Ibm Pcre Redhat

Products

Powerkvm Pcre Pcre2 and 2 more

CVE-2016-3191

pcre: workspace overflow for (*ACCEPT) with deeply nested parentheses (8.39/13, 10.22/12)

The compile_branch function in pcre_compile.c in PCRE 8.x before 8.39 and pcre2_compile.c in PCRE2 before 10.22 mishandles patterns containing an (*ACCEPT) substring in conjunction with nested parentheses, which allows remote attackers to execute arbitrary code or cause a denial of service (stack-based buffer overflow) via a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror, aka ZDI-CAN-3542.

CVSS 3.0 · 9.8 Critical EPSS 8.4% KEV · Not listed

Vendors

Pcre Redhat

Products

Pcre Pcre2 Enterprise Linux and 1 more

CVE-2022-1586

pcre2: Out-of-bounds read in compile_xclass_matchingpath in pcre2_jit_compile.c

An out-of-bounds read vulnerability was discovered in the PCRE2 library in the compile_xclass_matchingpath() function of the pcre2_jit_compile.c file. This involves a unicode property matching issue in JIT-compiled regular expressions. The issue occurs because the character was not fully read in case-less matching within JIT.

CVSS 3.1 · 9.1 Critical EPSS 3.4% KEV · Not listed

Vendors

Debian Fedoraproject Netapp and 2 more

Products

Debian Linux Fedora Active Iq Unified Manager and 15 more

CVE-2022-41409

pcre2: negative repeat value in a pcre2test subject line leads to inifinite loop

Integer overflow vulnerability in pcre2test before 10.41 allows attackers to cause a denial of service or other unspecified impacts via negative input.

CVSS 3.1 · 7.5 High EPSS 1.1% KEV · Not listed

Vendors

Pcre

Products

Pcre2

CVE-2022-1587

pcre2: Out-of-bounds read in get_recurse_data_length in pcre2_jit_compile.c

An out-of-bounds read vulnerability was discovered in the PCRE2 library in the get_recurse_data_length() function of the pcre2_jit_compile.c file. This issue affects recursions in JIT-compiled regular expressions caused by duplicate data transfers.

CVSS 3.1 · 9.1 Critical EPSS 2.8% KEV · Not listed

Vendors

Fedoraproject Netapp Pcre and 1 more

Products

Fedora Active Iq Unified Manager H300s and 14 more