High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2017-12837
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:16 UTC · Revision 1
Source evidence
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.
osv:CVE-2017-12837
Complete source record
{
"id": "18a06985bb25e47d5b66103d2d36fc204bffbe4f64e91af2eb8a18d99bda1c17",
"url": "https://osv.dev/vulnerability/CVE-2017-12837",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2017-12837",
"summary": "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.",
"evidence": "osv:CVE-2017-12837",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2017-12837",
"aliases": [
"CVE-2017-12837"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/perl/perl5",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "eb3b805818a89c08b5564d383beddf70f69af1a3"
},
{
"introduced": "95388f2eb27e74cdbfb715c0097f16aeba4e6e4e"
},
{
"last_affected": "95388f2eb27e74cdbfb715c0097f16aeba4e6e4e"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:perl:perl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "5.24.2"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:perl:perl:5.26.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.26.0"
},
{
"last_affected": "5.26.0"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"5.26.0",
"v5.26.0",
"v5.24.2",
"v5.24.2-RC1",
"v5.24.1",
"v5.24.1-RC5",
"v5.24.1-RC4",
"v5.24.1-RC3",
"v5.24.1-RC2",
"v5.24.1-RC1",
"v5.24.0",
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"v5.24.0-RC4",
"v5.24.0-RC3",
"v5.24.0-RC2",
"v5.24.0-RC1",
"v5.23.7",
"v5.23.6",
"v5.23.4",
"v5.23.3",
"if-0.0605",
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"v5.23.1",
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"v5.22.0",
"v5.22.0-RC2",
"v5.22.0-RC1",
"v5.21.11",
"if-0.0604",
"v5.21.10",
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"v5.21.1",
"v5.21.0",
"v5.20.0",
"v5.20.0-RC1",
"v5.19.11",
"v5.19.7",
"v5.19.5",
"v5.19.3",
"v5.19.2",
"if-0.0603",
"v5.19.1",
"v5.18.0",
"v5.19.0",
"v5.18.0-RC4",
"v5.18.0-RC3",
"v5.18.0-RC2",
"v5.18.0-RC1",
"v5.17.9",
"v5.17.8",
"v5.17.7.0",
"v5.17.7",
"v5.17.6",
"v5.17.4",
"v5.17.2",
"v5.17.0",
"v5.16.0",
"v5.16.0-RC2",
"v5.16.0-RC1",
"v5.15.9",
"v5.15.5",
"v5.15.4",
"v5.15.3",
"v5.15.2",
"v5.15.1",
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"v5.14.0",
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"v5.14.0-RC2",
"v5.14.0-RC1",
"v5.13.11",
"v5.13.10",
"v5.13.9",
"v5.13.8",
"v5.13.7",
"v5.13.6",
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"v5.13.3",
"v5.13.2",
"v5.13.1",
"v5.12.0",
"v5.13.0",
"v5.12.0-RC5",
"v5.12.0-RC4",
"v5.12.0-RC3",
"v5.12.0-RC2",
"v5.12.0-RC1",
"v5.12.0-RC0",
"v5.11.5",
"v5.11.4",
"v5.11.3",
"v5.11.1",
"v5.11.0",
"GitLive-blead",
"v5.10.0",
"perl-5.9.5",
"perl-5.9.4",
"perl-5.9.3",
"perl-5.9.2",
"perl-5.9.1",
"perl-5.9.0",
"perl-5.8.0",
"perl-5.7.3",
"perl-5.7.2",
"perl-5.7.1",
"perl-5.7.0",
"perl-5.6.0",
"perl-5.005",
"perl-5.003",
"perl-5.002_01",
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"perl-5.001n",
"perl-5.001",
"perl-5.000o",
"perl-5.000",
"perl-5a9",
"perl-5a2",
"perl-4.0.36",
"perl-4.0.00",
"perl-3.044",
"perl-3.000",
"perl-2.0",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-12837.json"
}
}
],
"modified": "2026-10-24T10:30:51.004063161Z",
"provider": "osv",
"references": [
"https://rt.perl.org/Public/Bug/Display.html?id=131582",
"https://www.oracle.com/security-alerts/cpujul2020.html",
"https://perl5.git.perl.org/perl.git/log/refs/tags/v5.24.3-RC1",
"https://perl5.git.perl.org/perl.git/log/refs/tags/v5.26.1-RC1",
"https://security.netapp.com/advisory/ntap-20180426-0001/",
"https://bugzilla.redhat.com/show_bug.cgi?id=1492091",
"https://perl5.git.perl.org/perl.git/commitdiff/96c83ed78aeea1a0496dd2b2d935869a822dc8a5"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2017-12837",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 437390,
"published_at": "2017-09-19T18:29:00.167+00:00"
}