2.5

CVE-2026-18743: rpm-software-management popt Incorrect Calculation of Buffer Size

CVSS: 2.5v3.1LowAwaiting analysis
AliasesUBUNTU-CVE-2026-18743DEBIAN-CVE-2026-18743
Published 01-09-2026Last modified 08-09-2026
Open JSON

Vulnerability summary

CVE-2026-18743 is a low (CVSS 2.5) Incorrect Calculation of Buffer Size vulnerability in rpm-software-management popt. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.1% 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 · 0.00 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. 01-09-2026
    PublishedVulnerability first disclosed.
  2. 08-09-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in popt. This vulnerability allows an attacker to provide specially crafted configuration content to a host, which, when loaded, can lead to a small memory corruption issue. This occurs because of an error in how the `poptConfigFileToString` function reallocates memory for buffers. Successful exploitation could result in heap metadata corruption, potentially causing the affected process to become unavailable (denial of service).

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

0.00 pp

From 0.14% on 21-09-2026

21-09-202621-10-2026
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≥ 1.11 (No fix recorded)
Ubuntu1 product
  • poptAll versions (No fix recorded)

3 vendors · 3 products

References

6 links