CVE-2026-18743

LOWPre-NVD 2.52.5—
EchelonGraph scoreHIGH confidence

Score 2.5 from GitHub Security Advisory (severity: LOW) published 2026-09-01. a secondary CVSS source baseline 2.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
2.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 2.5Exploit: None knownExposed: 0

A fix is available — apply it.

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 v3
2.5
EG Score
2.5(high)
EG Risk
11(Track)
EG Risk 11/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity25% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 8, 2026

References (3)

Vendor Advisories for CVE-2026-18743(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatpopt-main-1.19-11.1.hum12026-08-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
popt1.19+dfsg-1, 1.19+dfsg-2——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
popt1.19+dfsg-2——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
popt1.19+dfsg-2——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-17 11:27 UTCEG score recompute
  3. 2026-09-17 11:27 UTCVendor advisory
  4. 2026-09-17 11:27 UTCGHSA enrichment
  5. 2026-09-16 14:07 UTCEPSS rescore
  6. 2026-09-16 05:14 UTCEPSS rescore
  7. 2026-09-14 15:23 UTCEG score recompute
  8. 2026-09-14 15:23 UTCVendor advisory
  9. 2026-09-14 15:23 UTCGHSA enrichment
  10. 2026-09-13 16:46 UTCEPSS rescore
  11. 2026-09-12 15:00 UTCEPSS rescore
  12. 2026-09-11 19:21 UTCEG score recompute
  13. 2026-09-11 19:21 UTCVendor advisory
  14. 2026-09-11 19:21 UTCGHSA enrichment
  15. 2026-09-11 09:36 UTCEPSS rescore
  16. 2026-09-10 09:34 UTCEPSS rescore
  17. 2026-09-08 23:20 UTCEG score recompute
  18. 2026-09-08 23:20 UTCVendor advisory
  19. 2026-09-08 23:20 UTCGHSA enrichment
  20. 2026-09-08 23:03 UTCEG score recompute
  21. 2026-09-08 23:03 UTCVendor advisory
  22. 2026-09-08 23:03 UTCGHSA enrichment
  23. 2026-09-08 22:00 UTCEPSS rescore
  24. 2026-09-07 16:01 UTCEPSS rescore
  25. 2026-09-07 14:56 UTCEG score recompute
Show 23 more
  1. 2026-09-07 14:56 UTCVendor advisory
  2. 2026-09-07 14:56 UTCGHSA enrichment
  3. 2026-09-06 13:47 UTCEPSS rescore
  4. 2026-09-04 17:09 UTCEG score recompute
  5. 2026-09-04 17:09 UTCGHSA enrichment
  6. 2026-09-04 05:06 UTCEPSS rescore
  7. 2026-09-01 21:09 UTCGHSA enrichment
  8. 2026-09-01 15:40 UTCEG score recompute
  9. 2026-09-01 15:40 UTCGHSA enrichment
  10. 2026-09-01 14:34 UTCEG score recompute
  11. 2026-09-01 14:34 UTCGHSA enrichment
  12. 2026-09-01 13:53 UTCEPSS rescore
  13. 2026-09-01 13:30 UTCEG score recompute
  14. 2026-09-01 13:30 UTCGHSA enrichment
  15. 2026-09-01 13:17 UTCEG score recompute
  16. 2026-09-01 13:17 UTCGHSA enrichment
  17. 2026-09-01 09:34 UTCEG score recompute
  18. 2026-09-01 09:34 UTCGHSA enrichment
  19. 2026-09-01 09:00 UTCEG score recompute
  20. 2026-09-01 09:00 UTCGHSA enrichment
  21. 2026-09-01 02:22 UTCEG score recompute
  22. 2026-09-01 01:25 UTCEG score recompute
  23. 2026-09-01 01:24 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18743?
CVE-2026-18743 is a low vulnerability published on September 1, 2026. 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.…
When was CVE-2026-18743 disclosed?
CVE-2026-18743 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18743 actively exploited?
CVE-2026-18743 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.2% of all scored CVEs.
What is the CVSS score of CVE-2026-18743?
CVE-2026-18743 has a CVSS v3 base score of 2.5 (NVD).
How do I remediate CVE-2026-18743?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18743, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-18743

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