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Vulnerability record · CVE-2016-6354 · published 21 September 2016

CVE-2016-6354: Debian linux memory buffer overflow vulnerability

Debian · Debian Linux

Heap-based buffer overflow in the yy_get_next_buffer function in Flex before 2.6.1 might allow context-dependent attackers to cause a denial of service or possibly execute arbitrary code via vectors involving num_to_read.

9.8 CVSS 3.0 Critical EPSS 8.8% · top 5.0% CWE-119 · Memory buffer overflow
9.8CVSS 3.0 base score, v2 7.5
8.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

Heap-based buffer overflow in the yy_get_next_buffer function in Flex before 2.6.1 might allow context-dependent attackers to cause a denial of service or possibly execute arbitrary code via vectors involving num_to_read.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.debian.org/security/2016/dsa-3653 Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/07/18/8 Release NotesThird Party Advisory
http://www.openwall.com/lists/oss-security/2016/07/26/12 Release NotesThird Party Advisory
https://github.com/westes/flex/commit/a5cbe929ac3255d371e698f62dc256afe7006466 Patch
https://security.gentoo.org/glsa/201701-31
http://www.debian.org/security/2016/dsa-3653 Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/07/18/8 Release NotesThird Party Advisory
http://www.openwall.com/lists/oss-security/2016/07/26/12 Release NotesThird Party Advisory
https://github.com/westes/flex/commit/a5cbe929ac3255d371e698f62dc256afe7006466 Patch
https://security.gentoo.org/glsa/201701-31

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Source: NIST National Vulnerability Database (record CVE-2016-6354), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.