CVE-2018-1061

Name: CVE-2018-1061
Creator: NVD / NIST
Published: 2018-06-19T12:29:00.22+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.98%

Last modified Jun 17, 2026

CVE-2018-1061 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 4.98% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

4.98%

91.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions	Update
Python	Python	< 2.7.15	—
Python	Python	>= 3.0, < 3.4.9	—
Python	Python	>= 3.5.0, <= 3.5.5	—
Python	Python	>= 3.6, <= 3.6.4	—
Python	Python	3.7.0	Alpha1
Debian	Debian Linux	8.0	—
Debian	Debian Linux	9.0	—
Redhat	Ansible Tower	3.3	—
Redhat	Enterprise Linux Desktop	7.0	—
Redhat	Enterprise Linux Server	7.0	—
Redhat	Enterprise Linux Workstation	7.0	—
Canonical	Ubuntu Linux	12.04	—
Canonical	Ubuntu Linux	14.04	—
Canonical	Ubuntu Linux	16.04	—
Canonical	Ubuntu Linux	18.04	—
Fedoraproject	Fedora	28	—
Fedoraproject	Fedora	29	—
Fedoraproject	Fedora	30	—

References

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
http://www.securitytracker.com/id/1042001Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHBA-2019:0327Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3041Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3505Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1260
https://access.redhat.com/errata/RHSA-2019:3725
https://bugs.python.org/issue32981Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1061Issue Tracking
https://docs.python.org/3.5/whatsnew/changelog.html#python-3-5-6-release-candidate-1Vendor Advisory
https://docs.python.org/3.6/whatsnew/changelog.html#python-3-6-5-release-candidate-1Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00030.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00031.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/46PVWY5LFP4BRPG3BVQ5QEEFYBVEXHCK/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AEZ5IQT7OF7Q2NCGIVABOWYGKO7YU3NJ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JSKPGPZQNTAULHW4UH63KGOOUIDE4RRB/
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03951en_us
https://usn.ubuntu.com/3817-1/Third Party Advisory
https://usn.ubuntu.com/3817-2/Third Party Advisory
https://www.debian.org/security/2018/dsa-4306Third Party Advisory
https://www.debian.org/security/2018/dsa-4307Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
http://www.securitytracker.com/id/1042001Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHBA-2019:0327Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3041Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3505Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1260
https://access.redhat.com/errata/RHSA-2019:3725
https://bugs.python.org/issue32981Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1061Issue Tracking
https://docs.python.org/3.5/whatsnew/changelog.html#python-3-5-6-release-candidate-1Vendor Advisory
https://docs.python.org/3.6/whatsnew/changelog.html#python-3-6-5-release-candidate-1Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00030.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00031.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/46PVWY5LFP4BRPG3BVQ5QEEFYBVEXHCK/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AEZ5IQT7OF7Q2NCGIVABOWYGKO7YU3NJ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JSKPGPZQNTAULHW4UH63KGOOUIDE4RRB/
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03951en_us
https://usn.ubuntu.com/3817-1/Third Party Advisory
https://usn.ubuntu.com/3817-2/Third Party Advisory
https://www.debian.org/security/2018/dsa-4306Third Party Advisory
https://www.debian.org/security/2018/dsa-4307Third Party Advisory

Timeline

Published: Jun 19, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-1061?

How severe is CVE-2018-1061?

Severity scoring for CVE-2018-1061 is pending analysis. The EPSS model estimates a 4.98% probability of exploitation in the next 30 days.

How do I fix CVE-2018-1061?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-1061?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST