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Vulnerability record · CVE-2017-12837 · published 19 September 2017

CVE-2017-12837: Perl memory buffer overflow vulnerability

Perl · Perl

Heap-based buffer overflow in the S_regatom function in regcomp.c in Perl 5 before 5.24.3-RC1 and 5.26.x before 5.26.1-RC1 allows remote attackers to cause a denial of service (out-of-bounds write) via a regular expression with a '\N{}' escape and the case-insensitive modifier.

7.5 CVSS 3.0 High EPSS 6.2% · top 6.7% CWE-119 · Memory buffer overflow
7.5CVSS 3.0 base score, v2 5.0
6.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

Description

Heap-based buffer overflow in the S_regatom function in regcomp.c in Perl 5 before 5.24.3-RC1 and 5.26.x before 5.26.1-RC1 allows remote attackers to cause a denial of service (out-of-bounds write) via a regular expression with a '\N{}' escape and the case-insensitive modifier.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

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

References

LinkTags
http://www.debian.org/security/2017/dsa-3982
http://www.securityfocus.com/bid/100860 Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1492091 Issue TrackingPatchThird Party AdvisoryVDB Entry
https://perl5.git.perl.org/perl.git/commitdiff/96c83ed78aeea1a0496dd2b2d935869a822dc8a5 PatchVendor Advisory
https://perl5.git.perl.org/perl.git/log/refs/tags/v5.24.3-RC1 Release NotesVendor Advisory
https://perl5.git.perl.org/perl.git/log/refs/tags/v5.26.1-RC1 Release NotesVendor Advisory
https://rt.perl.org/Public/Bug/Display.html?id=131582
https://security.netapp.com/advisory/ntap-20180426-0001/
https://www.oracle.com/security-alerts/cpujul2020.html
http://www.debian.org/security/2017/dsa-3982
http://www.securityfocus.com/bid/100860 Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1492091 Issue TrackingPatchThird Party AdvisoryVDB Entry
https://perl5.git.perl.org/perl.git/commitdiff/96c83ed78aeea1a0496dd2b2d935869a822dc8a5 PatchVendor Advisory
https://perl5.git.perl.org/perl.git/log/refs/tags/v5.24.3-RC1 Release NotesVendor Advisory
https://perl5.git.perl.org/perl.git/log/refs/tags/v5.26.1-RC1 Release NotesVendor Advisory
https://rt.perl.org/Public/Bug/Display.html?id=131582
https://security.netapp.com/advisory/ntap-20180426-0001/
https://www.oracle.com/security-alerts/cpujul2020.html

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Related vulnerabilities

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

9.8CVE-2026-8376Perl vulnerabilityPerl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 have a heap buffer overflow when compiling regular express…EPSS 0.48%9.8CVE-2026-4176Perl vulnerabilityPerl versions from 5.9.4 before 5.40.4-RC1, from 5.41.0 before 5.42.2-RC1, from 5.43.0 before 5.43.9 contain a vulnerable version of Compress::Raw::Z…EPSS 0.81%9.8CVE-2022-48522Perl out-of-bounds write vulnerabilityIn Perl 5.34.0, function S_find_uninit_var in sv.c has a stack-based crash that can lead to remote code execution or local privilege escalation.EPSS 2.6%9.8CVE-2018-18311Perl integer overflow vulnerabilityPerl before 5.26.3 and 5.28.x before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.EPSS 12%9.8CVE-2018-18314Perl memory buffer overflow vulnerabilityPerl before 5.26.3 has a buffer overflow via a crafted regular expression that triggers invalid write operations.EPSS 6.1%9.8CVE-2018-18312Perl memory buffer overflow vulnerabilityPerl before 5.26.3 and 5.28.0 before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.EPSS 12%9.8CVE-2018-6797Debian linux out-of-bounds write vulnerabilityAn issue was discovered in Perl 5.18 through 5.26. A crafted regular expression can cause a heap-based buffer overflow, with control over the bytes w…EPSS 6.5%9.8CVE-2018-6913Debian linux out-of-bounds write vulnerabilityHeap-based buffer overflow in the pack function in Perl before 5.26.2 allows context-dependent attackers to execute arbitrary code via a large item c…EPSS 11%

Source: NIST National Vulnerability Database (record CVE-2017-12837), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.