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Vulnerability record · CVE-2019-20633 · published 25 March 2020

CVE-2019-20633: Gnu patch double free vulnerability

Gnu · Patch

GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function another_hunk in pch.c that can cause a denial of service via a crafted patch file. NOTE: this issue exists because of an incomplete fix for CVE-2018-6952.

5.5 CVSS 3.1 Medium EPSS 1.0% · top 37.9% CWE-415 · Double free
5.5CVSS 3.1 base score, v2 4.3
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function another_hunk in pch.c that can cause a denial of service via a crafted patch file. NOTE: this issue exists because of an incomplete fix for CVE-2018-6952.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

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

References

LinkTags
https://savannah.gnu.org/bugs/index.php?56683 ExploitVendor Advisory
https://savannah.gnu.org/bugs/index.php?56683 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2018-20969Gnu patch os command injection vulnerabilitydo_ed_script in pch.c in GNU patch through 2.7.6 does not block strings beginning with a ! character. NOTE: this is the same commit as for CVE-2019-1…EPSS 2.7%7.8CVE-2019-13638Gnu patch os command injection vulnerabilityGNU patch through 2.7.6 is vulnerable to OS shell command injection that can be exploited by opening a crafted patch file that contains an ed style d…EPSS 4.5%7.8CVE-2018-1000156Gnu patch improper input validation vulnerabilityGNU Patch version 2.7.6 contains an input validation vulnerability when processing patch files, specifically the EDITOR_PROGRAM invocation (using ed)…EPSS 5.3%7.5CVE-2015-1396Gnu patch path traversal vulnerabilityA Directory Traversal vulnerability exists in the GNU patch before 2.7.4. A remote attacker can write to arbitrary files via a symlink attack in a pa…EPSS 3.3%7.5CVE-2018-6951Gnu patch null pointer dereference vulnerabilityAn issue was discovered in GNU patch through 2.7.6. There is a segmentation fault, associated with a NULL pointer dereference, leading to a denial of…EPSS 8.4%7.5CVE-2018-6952Gnu patch double free vulnerabilityA double free exists in the another_hunk function in pch.c in GNU patch through 2.7.6.EPSS 8.2%7.5CVE-2015-1395Fedoraproject fedora path traversal vulnerabilityDirectory traversal vulnerability in GNU patch versions which support Git-style patching before 2.7.3 allows remote attackers to write to arbitrary f…EPSS 11%5.9CVE-2019-13636Gnu patch link following vulnerabilityIn GNU patch through 2.7.6, the following of symlinks is mishandled in certain cases other than input files. This affects inp.c and util.c.EPSS 3.9%

Source: NIST National Vulnerability Database (record CVE-2019-20633), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.