CVE-2018-1061

At a glance

Severity: MEDIUM 6.5
EPSS: EPSS 4.74 % · percentile 92 (2026-10-27)
State: PUBLISHED
Published: 2018-06-19
Updated: 2026-10-15
Assigner: redhat
NVD status: Modified

Description

python before versions 2.7.15, 3.4.9, 3.5.6rc1, 3.6.5rc1 and 3.7.0 is vulnerable to catastrophic backtracking in the difflib.IS_LINE_JUNK method. An attacker could use this flaw to cause denial of service.

Scores

Version	Score	Vector	Scored by
CVSS 3.0	MEDIUM 6.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	redhat
CVSS 3.0	MEDIUM 6.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	NVD · secalert@redhat.com (Secondary)
CVSS 3.0	HIGH 7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	MEDIUM 5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-20

European references

ENISA EUVD · EUVD-2018-11714
GCVE · GCVE-0-2018-1061

CERT-FR advisories

CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2022-AVI-267 — Multiples vulnérabilités dans Juniper Networks Junos Space · cert.ssi.gouv.fr
CERTFR-2019-AVI-325 — Multiples vulnérabilités dans les produits Juniper · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:python:python:*:*:*:*:*:*:*:* < 2.7.15
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* ≥ 3.0 < 3.4.9
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* ≥ 3.5.0 ≤ 3.5.5
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* ≥ 3.6 ≤ 3.6.4
cpe:2.3:a:python:python:3.7.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:alpha4:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:beta1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:beta2:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:beta3:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:beta4:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:beta5:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:ansible_tower:3.3:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*

Affected products

Product	Versions
[UNKNOWN] · python	affected python 2.7.15 ; affected python 3.4.9 ; affected python 3.5.6 ; affected python 3.7.0

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD