CVE-2026-1998

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Elevated
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw has been found in micropython up to 1.27.0. This vulnerability affects the function mp_import_all of the file py/runtime.c. This manipulation causes memory corruption. The attack needs to be launched locally. The exploit has been published and may be used. Patch name: 570744d06c5ba9dba59b4c3f432ca4f0abd396b6. It is suggested to install a patch to address this issue.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity55% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

February 6, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Aug 9, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
github_pr

py/runtime: Make import-all support non-modules via __dict__/__all__.

Fix merged in micropython/micropython PR #18671 on 2026-02-04 — awaiting tagged release

https://github.com/micropython/micropython/pull/18671
generic🟡 PoC Available

Segmentation Fault in mp_map_lookup triggered by mp_import_all · Issue #18639 · micropython/micropython · GitHub

https://github.com/micropython/micropython/issues/18639#issue-3780651410
generic🟡 PoC Available

Segmentation Fault in mp_map_lookup triggered by mp_import_all · Issue #18639 · micropython/micropython · GitHub

https://github.com/micropython/micropython/issues/18639
generic

GitHub - micropython/micropython: MicroPython - a lean and efficient Python implementation for microcontrollers and constrained systems · GitHub

https://github.com/micropython/micropython/
github_commit

commit 570744d06c5b (dpgeorge/micropython)

Fix landed in dpgeorge/micropython commit 570744d06c5b — awaiting tagged release

https://github.com/dpgeorge/micropython/commit/570744d06c5ba9dba59b4c3f432ca4f0abd396b6

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
micropython1.25.0+ds-1, 1.26.1+ds-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
micropython1.25.0+ds-1, 1.26.1+ds-1——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 24× 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.

Showing the most recent 100 of 175 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
  2. 2026-09-18 23:12 UTCOSV refresh
  3. 2026-09-18 19:27 UTCEPSS rescore
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  9. 2026-08-14 11:02 UTCEG score recompute
  10. 2026-08-14 11:02 UTCGHSA enrichment
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  18. 2026-08-09 15:42 UTCGHSA enrichment
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  22. 2026-08-07 22:40 UTCGHSA enrichment
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  25. 2026-08-06 04:17 UTCGHSA enrichment
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  30. 2026-08-02 21:19 UTCEG score recompute▲ 2.20
  31. 2026-08-02 21:19 UTCGHSA enrichment
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-1998?
CVE-2026-1998 is a medium vulnerability published on February 6, 2026. A flaw has been found in micropython up to 1.27.0. This vulnerability affects the function mpimportall of the file py/runtime.c. This manipulation causes memory corruption. The attack needs to be launched locally. The exploit has been published and may be used. Patch name:…
When was CVE-2026-1998 disclosed?
CVE-2026-1998 was first published in the National Vulnerability Database on February 6, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-1998 actively exploited?
CVE-2026-1998 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 88.4% of all scored CVEs.
What is the CVSS score of CVE-2026-1998?
CVE-2026-1998 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-1998?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-1998, 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.

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