CVE-2018-6797

9.8 CRITICAL 6% exploit odds Fix listed Memory safety Library

What it is

An issue was discovered in Perl 5.18 through 5.26. A crafted regular expression can cause a heap-based buffer overflow, with control over the bytes written.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 6.5% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2018-04-17 20:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 02:02 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 6.5% in the next 30 days (EPSS).
Severity: 9.8 CRITICAL (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2018-04-17 20:29 UTC
Last modified: 2026-06-17 02:02 UTC
Exploit probability: 6.5% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Modified

Affected

Debian Linux 8.0
Debian Linux 9.0
Perl ≤ 5.26
Canonical Ubuntu Linux 16.04
Canonical Ubuntu Linux 17.10
Redhat Enterprise Linux Server 7.0
Redhat Enterprise Linux Server 7.3
Redhat Enterprise Linux Server 7.4

Attack profile CVSS 3.0 · 9.8

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2018-6797.md and follow it. Check whether this project is affected by CVE-2018-6797. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record