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NVD / CVE Program· CNA mitre

CVE-2019-13636: In GNU patch through 2.7.6, the following of symlinks is mishandled in certain cases other than input files.

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3.8% (FIRST EPSS); higher than 90.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: patch (AlmaLinux:8) 2.7.6-11.el8; patch (Alpine:v3.10) 2.7.6-r5; patch (Alpine:v3.7) 2.7.5-r3.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to patch (AlmaLinux:8) 2.7.6-11.el8; patch (Alpine:v3.10) 2.7.6-r5; patch (Alpine:v3.7) 2.7.5-r3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In 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.

MediumCVSS 5.9 · v3.0—No exploit Fix available
Published
Jul 17, 2019
Updated
Jun 16, 2026
EPSS
3.8% · 90th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.8%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2019-13636

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
gnupatch

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • gnu patchup to 2.7.6 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8patchbefore 2.7.6-11.el82.7.6-11.el8
Alpine:v3.10patchbefore 2.7.6-r52.7.6-r5
Alpine:v3.7patchbefore 2.7.5-r32.7.5-r3
Alpine:v3.8patchbefore 2.7.6-r32.7.6-r3
Debian:10patchbefore 2.7.6-3+deb10u12.7.6-3+deb10u1
Debian:12patchbefore 2.7.6-52.7.6-5
Debian:8patchbefore 2.7.5-1+deb8u22.7.5-1+deb8u2
Debian:9patchbefore 2.7.5-1+deb9u22.7.5-1+deb9u2
openSUSE:Leap 15.3patchbefore 2.7.6-150000.5.3.12.7.6-150000.5.3.1
openSUSE:Tumbleweedpatchbefore 2.7.6-5.12.7.6-5.1
Red Hat:enterprise_linux:8::baseospatchbefore 0:2.7.6-11.el80:2.7.6-11.el8
Red Hat:enterprise_linux:8::baseospatch-debuginfobefore 0:2.7.6-11.el80:2.7.6-11.el8
Red Hat:enterprise_linux:8::baseospatch-debugsourcebefore 0:2.7.6-11.el80:2.7.6-11.el8
Rocky Linux:8patchbefore 0:2.7.6-11.el80:2.7.6-11.el8
SUSE:Linux Enterprise Module for Basesystem 15 SP3patchbefore 2.7.6-150000.5.3.12.7.6-150000.5.3.1
SUSE:Linux Enterprise Server 12 SP5patchbefore 2.7.5-8.8.12.7.5-8.8.1

Same product

gnu: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-1000156GNU Patch version 2.7.6 contains an input validation vulnerability when processing patch files, specifically the EDITOR_PROGRAM invocation (
    33Monitor
  • CVE-2018-6951An issue was discovered in GNU patch through 2.7.6.
    33Monitor
  • CVE-2015-1395Directory traversal vulnerability in GNU patch versions which support Git-style patching before 2.7.3 allows remote attackers to write to ar
    33Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2016-10713Feb 13, 2018 · An issue was discovered in GNU patch before 2.7.6.
    22Monitor
  • ← EarlierCVE-2018-6952Feb 13, 2018 · A double free exists in the another_hunk function in pch.c in GNU patch through 2.7.6.
    32Monitor
  • Later →CVE-2019-13638Jul 26, 2019 · GNU 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 e
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:patch2.7.6-11.el8 · AlmaLinux:8Package registry (OSV)
alpine:patch2.7.6-r5 · Alpine:v3.10Package registry (OSV)
debian:patch2.7.6-5 · Debian:12Package registry (OSV)
opensuse:patch2.7.6-150000.5.3.1 · openSUSE:Leap 15.3Package registry (OSV)
red hat:patch0:2.7.6-11.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:patch-debuginfo0:2.7.6-11.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:patch-debugsource0:2.7.6-11.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
rocky linux:patch0:2.7.6-11.el8 · Rocky Linux:8Package registry (OSV)
suse:patch2.7.6-150000.5.3.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-59 · Improper Link Resolution Before File Access ('Link Following')

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (11 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records