CVE-2026-90556

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-12. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

September 12, 2026

Last Modified

September 18, 2026

Advisory Details (5)

Auto-updated Sep 12, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

Freeciv before 3.2.6 Heap Buffer Overflow via worklist_load | Advisories | VulnCheck

https://www.vulncheck.com/advisories/freeciv-before-3.2.6-heap-buffer-overflow-via-worklist-load
github_commit

commit 75ecde3e86dd (freeciv/freeciv)

Fix landed in freeciv/freeciv commit 75ecde3e86dd — awaiting tagged release

https://github.com/freeciv/freeciv/commit/75ecde3e86ddf2fe775768450e9a290a4f4d4387
generic

freeciv/server/savegame/savegame3.c at R3_2_5 · freeciv/freeciv · GitHub

https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c#L964
generic

freeciv/server/savegame/savegame2.c at R3_2_5 · freeciv/freeciv · GitHub

https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c#L788
generic

GitHub - freeciv/freeciv: Freeciv is a Free and Open Source empire-building strategy game inspired by the history of human civilization. Upstream repository for the standalone Freeciv client and server. Report bugs and submit patches at https://redmine.freeciv.org/projects/freeciv · GitHub

https://github.com/freeciv/freeciv

Vendor Advisories for CVE-2026-90556(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 30× in last 7d / 37× 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. 2026-09-21 08:55 UTCGHSA enrichment
  2. 2026-09-20 20:27 UTCEG score recompute
  3. 2026-09-20 20:27 UTCGHSA enrichment
  4. 2026-09-20 20:16 UTCEPSS rescore
  5. 2026-09-20 08:00 UTCGHSA enrichment
  6. 2026-09-19 19:28 UTCEG score recompute
  7. 2026-09-19 19:28 UTCGHSA enrichment
  8. 2026-09-19 07:00 UTCEG score recompute
  9. 2026-09-19 07:00 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 18:33 UTCEG score recompute
  12. 2026-09-18 18:33 UTCGHSA enrichment
  13. 2026-09-18 17:29 UTCEG score recompute
  14. 2026-09-18 17:29 UTCGHSA enrichment
  15. 2026-09-18 12:22 UTCGHSA enrichment
  16. 2026-09-17 23:52 UTCEG score recompute
  17. 2026-09-17 23:52 UTCGHSA enrichment
  18. 2026-09-17 19:32 UTCEPSS rescore
  19. 2026-09-17 10:49 UTCGHSA enrichment
  20. 2026-09-16 22:21 UTCEG score recompute
  21. 2026-09-16 22:21 UTCGHSA enrichment
  22. 2026-09-16 14:09 UTCEPSS rescore
  23. 2026-09-16 09:41 UTCEG score recompute
  24. 2026-09-16 09:41 UTCGHSA enrichment
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 12 more
  1. 2026-09-15 21:13 UTCGHSA enrichment
  2. 2026-09-15 08:46 UTCEG score recompute
  3. 2026-09-15 08:45 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-14 20:16 UTCGHSA enrichment
  6. 2026-09-14 07:49 UTCGHSA enrichment
  7. 2026-09-13 19:22 UTCGHSA enrichment
  8. 2026-09-13 06:54 UTCEG score recompute
  9. 2026-09-13 06:54 UTCGHSA enrichment
  10. 2026-09-12 18:27 UTCEG score recompute
  11. 2026-09-12 18:12 UTCEG score recompute
  12. 2026-09-12 18:12 UTCMITRE cvelistV5first tracked

Related CVEs

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Frequently asked(5)

What is CVE-2026-90556?
CVE-2026-90556 is a high vulnerability published on September 12, 2026. Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated…
When was CVE-2026-90556 disclosed?
CVE-2026-90556 was first published in the National Vulnerability Database on September 12, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90556 actively exploited?
CVE-2026-90556 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 96.4% of all scored CVEs.
What is the CVSS score of CVE-2026-90556?
CVE-2026-90556 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-90556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90556, 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

Explore the affected products and dependency analysis for CVE-2026-90556

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