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Vulnerability record · CVE-2017-8786 · published 5 May 2017

CVE-2017-8786: Pcre2 memory buffer overflow vulnerability

Pcre · Pcre2

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.

9.8 CVSS 3.0 Critical EPSS 4.1% · top 9.7% CWE-119 · Memory buffer overflow
9.8CVSS 3.0 base score, v2 7.5
4.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

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/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blogs.gentoo.org/ago/2017/04/29/libpcre-heap-based-buffer-overflow-write-in-pcre2test-c/ ExploitPatchThird Party AdvisoryVDB Entry
https://bugs.exim.org/show_bug.cgi?id=2079 ExploitIssue TrackingThird Party AdvisoryVDB Entry
https://security.gentoo.org/glsa/201710-09
https://vcs.pcre.org/pcre2?view=revision&revision=696 PatchVendor Advisory
https://vcs.pcre.org/pcre2?view=revision&revision=697 PatchVendor Advisory
https://blogs.gentoo.org/ago/2017/04/29/libpcre-heap-based-buffer-overflow-write-in-pcre2test-c/ ExploitPatchThird Party AdvisoryVDB Entry
https://bugs.exim.org/show_bug.cgi?id=2079 ExploitIssue TrackingThird Party AdvisoryVDB Entry
https://security.gentoo.org/glsa/201710-09
https://vcs.pcre.org/pcre2?view=revision&revision=696 PatchVendor Advisory
https://vcs.pcre.org/pcre2?view=revision&revision=697 PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2017-8399Pcre2 memory buffer overflow vulnerabilityPCRE2 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…EPSS 3.1%9.8CVE-2015-3210Pcre2 out-of-bounds write vulnerabilityHeap-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 expressi…EPSS 9.2%9.8CVE-2016-3191Pcre memory buffer overflow vulnerabilityThe 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 (*A…EPSS 8.4%9.1CVE-2022-1586Pcre2 out-of-bounds read vulnerabilityAn out-of-bounds read vulnerability was discovered in the PCRE2 library in the compile_xclass_matchingpath() function of the pcre2_jit_compile.c file…EPSS 3.4%9.1CVE-2022-1587Pcre2 out-of-bounds read vulnerabilityAn 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. Th…EPSS 2.8%7.8CVE-2026-89161Pcre2 vulnerabilityIn PCRE2 before 10.48, pcre2_jit_match mishandles a previously copied subject being passed in as a context. An incorrect free operation can occur.EPSS 0.13%7.5CVE-2022-41409Pcre2 integer overflow vulnerabilityInteger overflow vulnerability in pcre2test before 10.41 allows attackers to cause a denial of service or other unspecified impacts via negative inpu…EPSS 1.1%7.5CVE-2019-20454Pcre2 out-of-bounds read vulnerabilityAn 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…EPSS 1.6%

Source: NIST National Vulnerability Database (record CVE-2017-8786), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.