Text::CSV_XS versions before 1.65 for Perl allow quadratic CPU use by copying the unparsed remainder per record of CR-only input in getline
Text::CSV_XS versions before 1.65 for Perl allow quadratic CPU use by copying the unparsed remainder per record of CR-only input in getline. With eol unset, the default, getline reads with Perl's default line separator, so input with CR-only line endings arrives as one chunk. After each record the parser copies the whole unparsed remainder into a new buffer, which the next call parses and copies again, so the work grows with the square of the input size. A reader with default options that is sent CSV with classic Mac line endings spends seconds of CPU time on a megabyte of input.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-110755
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 19:12 UTC · Revision 1
Source evidence
Text::CSV_XS versions before 1.65 for Perl allow quadratic CPU use by copying the unparsed remainder per record of CR-only input in getline
core-osv · Original sourcePublished 16 Oct 2026, 22:07 UTC
Text::CSV_XS versions before 1.65 for Perl allow quadratic CPU use by copying the unparsed remainder per record of CR-only input in getline. With eol unset, the default, getline reads with Perl's default line separator, so input with CR-only line endings arrives as one chunk. After each record the parser copies the whole unparsed remainder into a new buffer, which the next call parses and copies again, so the work grows with the square of the input size. A reader with default options that is sent CSV with classic Mac line endings spends seconds of CPU time on a megabyte of input.
osv:CVE-2026-110755
Complete source record
{
"id": "3a44800fe4ceef687cb694983b4438bf2e8a6171ca83005a35c221249981aa2a",
"url": "https://osv.dev/vulnerability/CVE-2026-110755",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Text::CSV_XS versions before 1.65 for Perl allow quadratic CPU use by copying the unparsed remainder per record of CR-only input in getline",
"summary": "Text::CSV_XS versions before 1.65 for Perl allow quadratic CPU use by copying the unparsed remainder per record of CR-only input in getline. With eol unset, the default, getline reads with Perl's default line separator, so input with CR-only line endings arrives as one chunk. After each record the parser copies the whole unparsed remainder into a new buffer, which the next call parses and copies again, so the work grows with the square of the input size. A reader with default options that is sent CSV with classic Mac line endings spends seconds of CPU time on a megabyte of input.",
"evidence": "osv:CVE-2026-110755",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-110755",
"aliases": [
"CVE-2026-110755"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/cpan-authors/text-csv_xs",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "84085bcda35b916ff251e433cc5b7a1cf04066f5"
},
{
"fixed": "f25e00aacd6fc15857b22487cb2e5ca263f377e0"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.65"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"fixed": "f25e00aacd6fc15857b22487cb2e5ca263f377e0"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"1.64",
"1.63",
"1.62",
"1.61",
"1.60",
"1.59",
"1.58",
"1.56",
"1.55",
"1.54",
"1.53",
"1.51",
"1.50",
"1.49",
"1.48",
"1.47",
"1.46",
"1.45",
"1.44",
"1.43",
"1.42",
"1.41",
"1.40",
"1.39",
"1.38",
"1.37",
"1.36",
"1.35",
"1.34",
"1.33",
"1.32",
"1.31",
"1.30",
"1.29",
"1.28",
"1.27",
"1.26",
"1.25",
"1.24",
"1.23",
"1.22",
"1.21",
"1.20",
"1.19",
"1.18",
"1.17",
"1.16",
"1.15",
"1.14",
"1.13",
"1.12",
"1.11",
"1.10",
"1.09",
"1.08",
"1.07",
"1.06",
"1.05",
"1.04",
"1.03",
"1.02",
"1.01",
"1.00",
"0.99",
"0.98",
"0.97",
"0.96",
"0.95",
"0.94",
"0.93",
"0.92",
"0.91",
"0.90",
"0.88",
"0.87",
"0.86",
"0.85",
"0.84",
"0.83",
"0.82",
"0.81",
"0.80",
"0.79",
"0.78",
"0.77",
"0.76",
"0.75",
"0.74",
"0.73",
"0.72",
"0.71",
"0.70",
"0.69",
"0.68",
"0.67",
"0.66",
"0.65",
"0.64",
"0.63",
"0.62",
"0.61",
"0.60",
"0.59",
"0.58",
"0.57",
"0.56",
"0.55",
"0.54",
"0.53",
"0.52",
"0.51",
"0.50",
"0.46",
"0.45",
"0.44",
"0.43",
"0.42",
"0.41",
"0.40",
"0.37",
"0.36",
"0.35-Valloire",
"0.34",
"0.33"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110755.json"
}
}
],
"modified": "2026-10-28T02:30:31.485816356Z",
"provider": "osv",
"references": [
"https://cpan.org/modules",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110755.json",
"https://metacpan.org/release/HMBRAND/Text-CSV_XS-1.65/changes",
"https://nvd.nist.gov/vuln/detail/CVE-2026-110755",
"https://github.com/cpan-authors/Text-CSV_XS/commit/f25e00aacd6fc15857b22487cb2e5ca263f377e0.patch",
"https://github.com/cpan-authors/Text-CSV_XS"
],
"provider_metadata": {
"cwe_ids": [
"CWE-407"
],
"cna_assigner": "CPANSec",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110755.json"
}
},
"related_cves": [
{
"value": "CVE-2026-110755",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 498647,
"published_at": "2026-10-16T22:07:10.643+00:00"
}