2.5

CVE-2026-18739: rpm-software-management popt Out-of-bounds Write

CVSS: 2.5v3.1LowAwaiting analysis
AliasesUBUNTU-CVE-2026-18739DEBIAN-CVE-2026-18739
Published 04-08-2026Last modified 31-08-2026
Open JSON

Vulnerability summary

CVE-2026-18739 is a low (CVSS 2.5) Out-of-bounds Write vulnerability in rpm-software-management popt. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3% of scored vulnerabilities.

Overall risk
10/100
0100
Low · default modelHow is this calculated?
CVSS score
2.5/10
010
Low · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2026:56984

Timeline

  1. 04-08-2026
    PublishedVulnerability first disclosed.
  2. 31-08-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in popt, a command-line option parsing library. An off-by-one error in the poptStuffArgs function, when repeatedly called by a host application or through deep alias nesting, can lead to corruption of internal program data. This corruption could potentially enable a local attacker to execute arbitrary code if the host application then unsafely processes the altered data.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

+0.03 pp

From 0.11% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.14%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • poptAll versions (No fix recorded)
Rpm-software-management1 product
  • popt≥ 1.1.1 (No fix recorded)
Ubuntu1 product
  • poptAll versions (No fix recorded)

3 vendors · 3 products

References

6 links