CVE-2018-1061 json
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 m…
published 2018-06-19 8 y ago modified 2026-10-15 24 d ago also EUVD-2018-11714
- cvss
- 6.5
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.7%
- EPSS 4.7% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- python python 2.7.15, 3.4.9
- python2.7 Debian 11 2.7.14-7
debian advisories DEBIAN-CVE-2018-1061
- python2.7 Ubuntu 14.04 LTS 2.7.6-8ubuntu0.5
- python2.7 Ubuntu 16.04 LTS 2.7.12-1ubuntu0~16.04.4
- python3.4 Ubuntu 14.04 LTS 3.4.3-1ubuntu1~14.04.7
- python3.5 Ubuntu 16.04 LTS 3.5.2-2ubuntu0~16.04.5
- python3.5 Ubuntu Pro 14.04 LTS 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1
ubuntu advisories UBUNTU-CVE-2018-1061
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- rh-python36-python RHEL 3 SOFTWARE_COLLECTIONS 3.6.9-2.el6
- rh-python36-python RHEL 3 SOFTWARE_COLLECTIONS 3.6.9-2.el7
- rh-python36-python-libs RHEL 3 SOFTWARE_COLLECTIONS 3.6.9-2.el6
- rh-python36-python-libs RHEL 3 SOFTWARE_COLLECTIONS 3.6.9-2.el7
- rh-python36-python-test RHEL 3 SOFTWARE_COLLECTIONS 3.6.9-2.el6
- rh-python36-python-test RHEL 3 SOFTWARE_COLLECTIONS 3.6.9-2.el7
- rh-python36-python-tools RHEL 3 SOFTWARE_COLLECTIONS 3.6.9-2.el6
- rh-python36-python-tools RHEL 3 SOFTWARE_COLLECTIONS 3.6.9-2.el7
red hat advisories RHSA-2020:1346RHSA-2019:3725RHSA-2020:1268RHSA-2019:1260RHSA-2018:3041
- python SLE Module for Python 2 15 SP1, SLE Module for Desktop Applications 15 SP1, SLE Module for Desktop Applications 15 +2 more 2.7.17-7.32.2
- python-base SLE Module for Python 2 15 SP1, SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 2.7.17-7.32.1
- python3 SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 3.6.10-3.42.2
- python3-base SLE Module for Development Tools 15 SP1, SLE Module for Development Tools 15, SLE Module for Basesystem 15 SP1 +1 more 3.6.10-3.42.2
- python-base SLES 12 SP4, SLES 12 SP3, SLED 12 SP4 +7 more 2.7.13-28.16.1
- python SLES 12 SP4, SLES 12 SP3, SLED 12 SP4 +4 more 2.7.13-28.16.1
- python3 SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +1 more 3.4.6-25.16.1
- python3-base SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +2 more 3.4.6-25.16.1
suse advisories SUSE-SU-2020:0234-1SUSE-SU-2020:0114-1SUSE-SU-2018:3554-2SUSE-SU-2018:3554-1SUSE-SU-2018:2696-1SUSE-SU-2018:2408-1
- python openSUSE Tumbleweed 2.7.18-8.1
- python36 openSUSE Tumbleweed 3.6.15-1.1
- python3 openSUSE Leap 15.1 3.6.10-lp151.6.7.1
- python3-base openSUSE Leap 15.1 3.6.10-lp151.6.7.1
opensuse advisories openSUSE-SU-2024:11202-1openSUSE-SU-2024:11284-1openSUSE-SU-2020:0086-1
- python2 Alpine 3.15, Alpine 3.14, Alpine 3.13 +7 more 2.7.15-r0
- python3 Alpine 3.5 3.5.6-r0
- python3 Alpine 3.7, Alpine 3.6 3.6.5-r0
- python3 Alpine 3.8 3.6.6-r0
- python2-tkinter Alpine 3.11, Alpine 3.10, Alpine 3.9 2.7.15-r0
alpine advisories ALPINE-CVE-2018-1061
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2018-1061 updated cvss 6.5
python: DOS via regular expression backtracking in difflib.IS_LINE_JUNK method in difflib
-
Red Hat Enterprise Linux 5 python Red Hat Enterprise Linux 6 python, tkinter, python-libs, python-test, python-tools Red Hat Software Collections rh-python34-python, rh-python35-python, rh-python34-python-libs, rh-python34-python-test, rh-python35-python-libs, rh-python35-python-test, +4 moreaffected: no fix planned “Will not fix”
-
Red Hat Enterprise Linux Client (v. 7) python 2.7.5-76.el7, python-libs 2.7.5-76.el7 Red Hat Enterprise Linux Client Optional (v. 7) tkinter 2.7.5-76.el7, python-test 2.7.5-76.el7, python-tools 2.7.5-76.el7 Red Hat Enterprise Linux ComputeNode (v. 7) python 2.7.5-76.el7, python-libs 2.7.5-76.el7fixed: vendor fix RHSA-2018:3041
-
Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) python 2.7.5-74.el7_5, python-libs 2.7.5-74.el7_5fixed: vendor fix RHSA-2020:1268
-
Red Hat Enterprise Linux ComputeNode Optional (v. 7) tkinter 2.7.5-76.el7, python-test 2.7.5-76.el7, python-tools 2.7.5-76.el7fixed: vendor fix RHSA-2018:3041
-
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) tkinter 2.7.5-74.el7_5, python-test 2.7.5-74.el7_5, python-tools 2.7.5-74.el7_5fixed: vendor fix RHSA-2020:1268
-
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) python 2.7.5-76.el7, python-libs 2.7.5-76.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) tkinter 2.7.5-76.el7, python-test 2.7.5-76.el7, python-tools 2.7.5-76.el7 Red Hat Enterprise Linux Server (v. 7) python 2.7.5-76.el7, python-libs 2.7.5-76.el7fixed: vendor fix RHSA-2018:3041
-
Red Hat Enterprise Linux Server AUS (v. 7.4) python 2.7.5-63.el7_4, python-libs 2.7.5-63.el7_4 Red Hat Enterprise Linux Server E4S (v. 7.4) python 2.7.5-63.el7_4, python-libs 2.7.5-63.el7_4fixed: vendor fix RHSA-2020:1346
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Red Hat Enterprise Linux Server EUS (v. 7.5) python 2.7.5-74.el7_5, python-libs 2.7.5-74.el7_5fixed: vendor fix RHSA-2020:1268
show 8 moreshow fewer
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Red Hat Enterprise Linux Server Optional (v. 7) tkinter 2.7.5-76.el7, python-test 2.7.5-76.el7, python-tools 2.7.5-76.el7fixed: vendor fix RHSA-2018:3041
-
Red Hat Enterprise Linux Server Optional AUS (v. 7.4) tkinter 2.7.5-63.el7_4, python-test 2.7.5-63.el7_4, python-tools 2.7.5-63.el7_4 Red Hat Enterprise Linux Server Optional E4S (v. 7.4) tkinter 2.7.5-63.el7_4, python-test 2.7.5-63.el7_4, python-tools 2.7.5-63.el7_4fixed: vendor fix RHSA-2020:1346
-
Red Hat Enterprise Linux Server Optional EUS (v. 7.5) tkinter 2.7.5-74.el7_5, python-test 2.7.5-74.el7_5, python-tools 2.7.5-74.el7_5fixed: vendor fix RHSA-2020:1268
-
Red Hat Enterprise Linux Server Optional TUS (v. 7.4) tkinter 2.7.5-63.el7_4, python-test 2.7.5-63.el7_4, python-tools 2.7.5-63.el7_4 Red Hat Enterprise Linux Server TUS (v. 7.4) python 2.7.5-63.el7_4, python-libs 2.7.5-63.el7_4fixed: vendor fix RHSA-2020:1346
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Red Hat Enterprise Linux Workstation (v. 7) python 2.7.5-76.el7, python-libs 2.7.5-76.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) tkinter 2.7.5-76.el7, python-test 2.7.5-76.el7, python-tools 2.7.5-76.el7fixed: vendor fix RHSA-2018:3041
-
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) python27-python 2.7.16-4.el6, python27-tkinter 2.7.16-4.el6, rh-python36-python 3.6.9-2.el6, python27-python-jinja2 2.6-12.el6, python27-python-libs 2.7.16-4.el6, python27-python-test 2.7.16-4.el6, +5 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) python27-python 2.7.16-4.el7, python27-tkinter 2.7.16-4.el7, rh-python36-python 3.6.9-2.el7, python27-python-jinja2 2.6-15.el7, python27-python-libs 2.7.16-4.el7, python27-python-test 2.7.16-4.el7, +5 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) python27-python 2.7.16-4.el7, python27-tkinter 2.7.16-4.el7, python27-python-jinja2 2.6-15.el7, python27-python-libs 2.7.16-4.el7, python27-python-test 2.7.16-4.el7, python27-python-tools 2.7.16-4.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) python27-python 2.7.16-4.el7, python27-tkinter 2.7.16-4.el7, rh-python36-python 3.6.9-2.el7, python27-python-jinja2 2.6-15.el7, python27-python-libs 2.7.16-4.el7, python27-python-test 2.7.16-4.el7, +5 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) python27-python 2.7.16-4.el7, python27-tkinter 2.7.16-4.el7, rh-python36-python 3.6.9-2.el7, python27-python-jinja2 2.6-15.el7, python27-python-libs 2.7.16-4.el7, python27-python-test 2.7.16-4.el7, +5 morefixed: vendor fix RHSA-2019:1260
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Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-python36-python 3.6.9-2.el7, rh-python36-python-libs 3.6.9-2.el7, rh-python36-python-test 3.6.9-2.el7, rh-python36-python-tools 3.6.9-2.el7, rh-python36-python-tkinter 3.6.9-2.el7fixed: vendor fix RHSA-2019:3725
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Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) python27-python 2.7.16-4.el6, python27-tkinter 2.7.16-4.el6, rh-python36-python 3.6.9-2.el6, python27-python-jinja2 2.6-12.el6, python27-python-libs 2.7.16-4.el6, python27-python-test 2.7.16-4.el6, +5 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) python27-python 2.7.16-4.el7, python27-tkinter 2.7.16-4.el7, rh-python36-python 3.6.9-2.el7, python27-python-jinja2 2.6-15.el7, python27-python-libs 2.7.16-4.el7, python27-python-test 2.7.16-4.el7, +5 morefixed: vendor fix RHSA-2019:1260
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 24 d ago
Exploit prediction
4.74% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 6.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| NVD | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Affected products
- [UNKNOWN] python
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
debian.org
/security/2018/dsa-4306
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/3817-2/
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2018:3505
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2018:3041
vendor-advisory, third-party-advisory
-
debian.org
/security/2018/dsa-4307
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/3817-1/
vendor-advisory, third-party-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/JSKPGPZQNTAULHW4UH63KGOOUIDE4RRB/
vendor-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/AEZ5IQT7OF7Q2NCGIVABOWYGKO7YU3NJ/
vendor-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/46PVWY5LFP4BRPG3BVQ5QEEFYBVEXHCK/
vendor-advisory
-
access.redhat.com
/errata/RHBA-2019:0327
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2019:1260
vendor-advisory
-
access.redhat.com
/errata/RHSA-2019:3725
vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-01/msg00040.html
vendor-advisory
-
bugs.python.org
/issue32981
vendor-advisory
-
docs.python.org
/3.6/whatsnew/changelog.html#python-3-6-5-release-candidate-1
vendor-advisory
-
docs.python.org
/3.5/whatsnew/changelog.html#python-3-5-6-release-candidate-1
vendor-advisory
-
bugzilla.redhat.com
/show_bug.cgi?id=CVE-2018-1061
issue-tracking
-
securitytracker.com
/id/1042001
vdb-entry, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2018/09/msg00031.html
mailing-list, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2018/09/msg00030.html
mailing-list, third-party-advisory
- support.hpe.com /hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03951en_us
Sources
- CVE List CVE-2018-1061
- NVD CVE-2018-1061
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.