CVE-2026-2258

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 92% 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 aardappel lobster up to 2025.4. Affected by this vulnerability is the function WaveFunctionCollapse in the library dev/src/lobster/wfc.h. Executing a manipulation can lead to memory corruption. The attack can only be executed locally. The exploit has been published and may be used. This patch is called c2047a33e1ac2c42ab7e8704b33f7ea518a11ffd. It is advisable to implement a patch to correct 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
9%
KEV
Not listed

Published

February 10, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Aug 7, 2026
Patch available. Sources: github_commit.
generic

0204/lob1/repro.lobster at main · oneafter/0204 · GitHub

https://github.com/oneafter/0204/blob/main/lob1/repro.lobster
generic

[Bug] stack-use-after-return in `WaveFunctionCollapse` (`wfc.h:52`) · Issue #395 · aardappel/lobster · GitHub

https://github.com/aardappel/lobster/issues/395#issuecomment-3849012938
generic

[Bug] stack-use-after-return in `WaveFunctionCollapse` (`wfc.h:52`) · Issue #395 · aardappel/lobster · GitHub

https://github.com/aardappel/lobster/issues/395
github_commit Patch Available

commit c2047a33e1ac (aardappel/lobster)

Patch available: aardappel/lobster v2026.1 (contains commit c2047a33e1ac)

https://github.com/aardappel/lobster/commit/c2047a33e1ac2c42ab7e8704b33f7ea518a11ffd
generic

GitHub - aardappel/lobster: The Lobster Programming Language · GitHub

https://github.com/aardappel/lobster/

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 28× 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 187 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
  2. 2026-09-20 20:15 UTCEPSS rescore
  3. 2026-09-18 22:23 UTCOSV refresh
  4. 2026-09-18 19:28 UTCEPSS rescore
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  21. 2026-08-31 01:46 UTCOSV refresh
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  1. 2026-08-26 14:46 UTCEPSS rescore
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  14. 2026-08-14 10:43 UTCEG score recompute
  15. 2026-08-14 10:43 UTCGHSA enrichment
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  17. 2026-08-13 02:59 UTCEG score recompute
  18. 2026-08-13 02:59 UTCGHSA enrichment
  19. 2026-08-12 13:50 UTCEPSS rescore
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  22. 2026-08-09 15:24 UTCEG score recompute
  23. 2026-08-09 15:24 UTCGHSA enrichment
  24. 2026-08-09 13:46 UTCEPSS rescore
  25. 2026-08-08 16:37 UTCEPSS rescore
  26. 2026-08-07 22:23 UTCEG score recompute
  27. 2026-08-07 22:23 UTCGHSA enrichment
  28. 2026-08-06 13:46 UTCEPSS rescore
  29. 2026-08-06 04:07 UTCEG score recompute
  30. 2026-08-06 04:07 UTCGHSA enrichment
  31. 2026-08-05 19:17 UTCEPSS rescore
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  34. 2026-08-02 21:03 UTCEG score recompute▲ 2.20
  35. 2026-08-02 21:03 UTCGHSA enrichment
  36. 2026-08-02 02:26 UTCEPSS rescore
  37. 2026-07-30 16:27 UTCEPSS rescore
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  57. 2026-07-17 17:29 UTCOSV refresh
  58. 2026-07-16 17:03 UTCEPSS rescore
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  74. 2026-07-06 02:23 UTCEPSS rescore
  75. 2026-07-06 02:23 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-2258?
CVE-2026-2258 is a medium vulnerability published on February 10, 2026. A flaw has been found in aardappel lobster up to 2025.4. Affected by this vulnerability is the function WaveFunctionCollapse in the library dev/src/lobster/wfc.h. Executing a manipulation can lead to memory corruption. The attack can only be executed locally. The exploit has been published and may…
When was CVE-2026-2258 disclosed?
CVE-2026-2258 was first published in the National Vulnerability Database on February 10, 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-2026-2258 actively exploited?
CVE-2026-2258 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 90.8% of all scored CVEs.
What is the CVSS score of CVE-2026-2258?
CVE-2026-2258 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-2258?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-2258, 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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