CVE-2018-1061

mediumpriority · track · 32EPSS 0.047 · 92 %ileDEEUFRRUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

4.74% (92nd) EPSS

CVSS 5 · medium

Is it mine?

58 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.06.5mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.06.5mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hsecondary · secalert@redhat.com USexploitability 2.8 · impact 3.6

v3.06.9mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USCWE-20US

affected products (58)

Products and version ranges known to be affected.

Avaya Aura Communication Managerall versionscert_bundDEcpe:/a:avaya:communication_manager:-
Avaya Aura Session Managerall versionscert_bundDEcpe:/a:avaya:session_manager:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Hitachi Command Suiteall versionscert_bundDEcpe:/a:hitachi:command_suite:-
Open Source Python 3.6.5all versionscert_bundDEcpe:/a:python:python:3.6.5
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
[UNKNOWN] Python≤ python 3.4.9enisa_euvdEU
[UNKNOWN] Python≤ python 3.5.6enisa_euvdEU
[UNKNOWN] Python≤ python 2.7.15enisa_euvdEU
[UNKNOWN] Python≤ python 3.7.0enisa_euvdEU
Canonical Ltd. Ubuntu≤ 12.04 ESMfstec_bduRU
Canonical Ltd. Ubuntu≤ 18.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 16.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 14.04 LTSfstec_bduRU
Fedora Project Fedora≤ 29fstec_bduRU
Fedora Project Fedora≤ 28fstec_bduRU
Fedora Project Fedora≤ 30fstec_bduRU
Python Software Foundation Python≤ 3.7.0 Alpha1fstec_bduRU

showing 20 of 58

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-1602Python: Mehrere Schwachstellen ermöglichten Denial of ServiceDeutsch2018-08-07csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Python ausnutzen, um einen Denial of Service Angriff durchzuführen.
CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
PSF-2018-4difflib and poplib catastrophic backtracking2018-06-19vendor · osvUS
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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund certfr osv NVD CVE.org MITRE

published 2018-06-19modified 2026-10-15

references (78)

External citations — patches, advisories, analysis.

scry

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