CVE-2017-0898

Severity: critical (CVSS 9.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 9.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2017-09-15 · updated 2026-06-17
Weakness: CWE-134

Description

Ruby before 2.4.2, 2.3.5, and 2.2.8 is vulnerable to a malicious format string which contains a precious specifier (*) with a huge minus value. Such situation can lead to a buffer overrun, resulting in a heap memory corruption or an information disclosure from the heap.

Affected products

Ruby: 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5 (+9)

References

http://www.securityfocus.com/bid/100862
http://www.securitytracker.com/id/1039363
https://access.redhat.com/errata/RHSA-2017:3485
https://access.redhat.com/errata/RHSA-2018:0378
https://access.redhat.com/errata/RHSA-2018:0583
https://access.redhat.com/errata/RHSA-2018:0585
https://github.com/mruby/mruby/issues/3722
https://hackerone.com/reports/212241
https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
https://security.gentoo.org/glsa/201710-18
https://usn.ubuntu.com/3685-1/
https://www.debian.org/security/2017/dsa-4031

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