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CVE-2026-18839

Popt-devel: popt-static: size_t underflow in singleoptionhelp

2.2 LowFix available

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.13%Unchanged since Aug 6, 2026
90%50%10%1%

What each source reports

CVE List Score used 2.2

Popt-devel: popt-static: size_t underflow in singleoptionhelp

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Record
CVE-2026-18839
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Weakness
CWE-191
Updated
2026-11-06
EUVDEUVD-2026-53642 2.2

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Record
EUVD-2026-53642
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-06
GitHub AdvisoriesGHSA-8fjx-p4xg-vgp8 2.2

An integer underflow was found in the popt library when formatting help text for option tables...

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Record
GHSA-8fjx-p4xg-vgp8
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Weakness
CWE-191
Updated
2026-11-02
NVD 2.2

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Record
CVE-2026-18839
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Weakness
CWE-191
Updated
2026-11-06
OSVDEBIAN-CVE-2026-18839 2.2

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Record
DEBIAN-CVE-2026-18839
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-07
OSVOESA-2026-4392 2.2

popt security update

The popt library exists essentially for parsing command line options. Some specific advantages of popt are no global variables (allowing multiple passes in parsing argv), parsing an arbitrary array of argv-style elements (allowing parsing of command-line-strings from any source), a standard method of option aliasing, ability to exec external option filters, and automatic generation of help and usage messages.

Security Fix(es):

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.(CVE-2026-18839)

Record
OESA-2026-4392
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-02
Show 7 moreShow less
OSVOESA-2026-4393 2.2

popt security update

The popt library exists essentially for parsing command line options. Some specific advantages of popt are no global variables (allowing multiple passes in parsing argv), parsing an arbitrary array of argv-style elements (allowing parsing of command-line-strings from any source), a standard method of option aliasing, ability to exec external option filters, and automatic generation of help and usage messages.

Security Fix(es):

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.(CVE-2026-18839)

Record
OESA-2026-4393
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVOESA-2026-4394 2.2

popt security update

The popt library exists essentially for parsing command line options. Some specific advantages of popt are no global variables (allowing multiple passes in parsing argv), parsing an arbitrary array of argv-style elements (allowing parsing of command-line-strings from any source), a standard method of option aliasing, ability to exec external option filters, and automatic generation of help and usage messages.

Security Fix(es):

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.(CVE-2026-18839)

Record
OESA-2026-4394
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVOESA-2026-4395 2.2

popt security update

The popt library exists essentially for parsing command line options. Some specific advantages of popt are no global variables (allowing multiple passes in parsing argv), parsing an arbitrary array of argv-style elements (allowing parsing of command-line-strings from any source), a standard method of option aliasing, ability to exec external option filters, and automatic generation of help and usage messages.

Security Fix(es):

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.(CVE-2026-18839)

Record
OESA-2026-4395
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVRHSA-2026:77932 2.2

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:77932
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2026-18839 2.2

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Record
UBUNTU-CVE-2026-18839
CVSS 3.1
2.2 LowCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVAZL-94511 No score

CVE-2026-18839 affecting package popt 1.19-2

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Record
AZL-94511
Updated
2026-11-05
OSVAZL-94668 No score

CVE-2026-18839 affecting package rsync 3.5.1-1

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Record
AZL-94668
Updated
2026-11-05

Affected products

Affected packages

Affected packages
PackageAffectedFixed
popt
Azure Linux:3
 through 1.19-2 None known
rsync
Azure Linux:3
 through 3.5.1-1 None known
popt
Debian:12
 All versions, plus listed versions
1.19+dfsg-11.19+dfsg-2
 None known
popt
Debian:13
 All versions, plus listed versions
1.19+dfsg-2
 None known
popt
Debian:14
 All versions, plus listed versions
1.19+dfsg-2
 None known
popt
openEuler:22.03-LTS-SP4
 before 1.18-6.oe2203sp4
1.18-6.oe2203sp4
popt
openEuler:24.03-LTS-SP1
 before 1.19-7.oe2403sp1
1.19-7.oe2403sp1
popt
openEuler:24.03-LTS-SP3
 before 1.19-7.oe2403sp3
1.19-7.oe2403sp3
popt
openEuler:24.03-LTS-SP4
 before 1.19-7.oe2403sp4
1.19-7.oe2403sp4
popt
Red Hat:hummingbird:1
 before 0:1.19-11.2.hum1
0:1.19-11.2.hum1
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Affected packages
PackageAffectedFixed
popt-devel
Red Hat:hummingbird:1
 before 0:1.19-11.2.hum1
0:1.19-11.2.hum1
popt-static
Red Hat:hummingbird:1
 before 0:1.19-11.2.hum1
0:1.19-11.2.hum1
popt
Ubuntu:14.04:LTS
 All versions, plus listed versions
1.16-7ubuntu31.16-81.16-8ubuntu1
 None known
popt
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.16-10
 None known
popt
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.16-101.16-11
 None known
popt
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.16-121.16-14
 None known
popt
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.18-2build21.18-2build31.18-31.18-3build1
 None known
popt
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.19+dfsg-11.19+dfsg-1build1
 None known
popt
Ubuntu:26.10
 All versions, plus listed versions
1.19+dfsg-2build1
 None known
popt
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.19+dfsg-21.19+dfsg-2build1
 None known

History

History
RecordedChangedSources
productsCVE List, EUVD
factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-18839 is a low vulnerability (CVSS 2.2) in Rpm-software-management Popt, published August 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.13%, the 2nd percentile. Fixed in popt 1.18-6.oe2203sp4.

References

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