What’s Vulnerable › Vulnerabilities

CVE-2018-1000052

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-02-09 · updated 2026-06-17
• Weakness: CWE-134

Description

fmtlib version prior to version 4.1.0 (before commit 0555cea5fc0bf890afe0071a558e44625a34ba85) contains a Memory corruption (SIGSEGV), CWE-134 vulnerability in fmt::print() library function that can result in Denial of Service. This attack appear to be exploitable via Specifying an invalid format specifier in the fmt::print() function results in a SIGSEGV (memory corruption, invalid write). This vulnerability appears to have been fixed in after commit 8cf30aa2be256eba07bb1cefb998c52326e846e7.

Affected products

• Fmt: before 4.1.0 — fixed in 4.1.0

How to fix

Upgrade to a fixed version: Fmt 4.1.0. Check the vendor advisory for mitigations.

References

• https://github.com/fmtlib/fmt/commit/8cf30aa2be256eba07bb1cefb998c52326e846e7
• https://github.com/fmtlib/fmt/issues/642
• https://github.com/fmtlib/fmt/commit/8cf30aa2be256eba07bb1cefb998c52326e846e7
• https://github.com/fmtlib/fmt/issues/642

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