CVE-2026-90557

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-09-12. A secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.1Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Freeciv versions 3.1.0 through 3.2.5 contain an out-of-bounds read vulnerability in sg_load_player_unit() when processing savegame files with invalid unit activity indices. An attacker can craft a malicious savegame file with an out-of-range activity index that bypasses bounds checking and causes a crash or limited heap memory exposure when loaded.

CVSS v3
6.1
EG Score
6.1MEDIUMhigh confidence
EG Risk
28
EG Risk 28/100CISA SSVC

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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 12, 2026

Last Modified

September 23, 2026

Advisory Details (5)

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

Freeciv 3.1.0 through 3.2.5 Out-of-Bounds Read via Savegame | Advisories | VulnCheck

https://www.vulncheck.com/advisories/freeciv-3.1.0-through-3.2.5-out-of-bounds-read-via-savegame
github_commit

commit ef0c76c2765f (freeciv/freeciv)

Fix landed in freeciv/freeciv commit ef0c76c2765f — awaiting tagged release

https://github.com/freeciv/freeciv/commit/ef0c76c2765fe383140eb1a70dbea1228844152e
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#L6108
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#L4282
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-2026-90557(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
freeciv3.0.6-1 ... 3.2.6+ds-1 (18 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
freeciv3.1.4+ds-2 ... 3.2.6+ds-1 (9 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freeciv3.1.4+ds-2 ... 3.2.5+ds-1 (7 versions)
  • every version up to 3.2.6+ds-1: fixed in 3.2.6+ds-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 63× 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. 2026-10-05 09:21 UTCEG score recompute
  2. 2026-10-05 09:21 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 08:08 UTCEG score recompute
  5. 2026-10-04 08:08 UTCGHSA enrichment
  6. 2026-10-03 06:56 UTCEG score recompute
  7. 2026-10-03 06:56 UTCGHSA enrichment
  8. 2026-10-02 05:44 UTCEG score recompute
  9. 2026-10-02 05:44 UTCGHSA enrichment
  10. 2026-10-01 19:51 UTCEPSS rescore
  11. 2026-10-01 03:00 UTCEG score recompute
  12. 2026-10-01 03:00 UTCGHSA enrichment
  13. 2026-09-30 15:04 UTCEPSS rescore
  14. 2026-09-30 01:46 UTCEG score recompute
  15. 2026-09-30 01:46 UTCGHSA enrichment
  16. 2026-09-29 00:34 UTCEG score recompute
  17. 2026-09-29 00:34 UTCGHSA enrichment
  18. 2026-09-28 13:52 UTCEPSS rescore
  19. 2026-09-28 13:52 UTCEPSS rescore
  20. 2026-09-27 23:23 UTCEG score recompute
  21. 2026-09-27 23:23 UTCGHSA enrichment
  22. 2026-09-27 13:49 UTCEPSS rescore
  23. 2026-09-26 22:11 UTCEG score recompute
  24. 2026-09-26 22:11 UTCGHSA enrichment
  25. 2026-09-26 15:59 UTCEPSS rescore
Show 38 more
  1. 2026-09-25 21:00 UTCGHSA enrichment
  2. 2026-09-24 18:34 UTCEG score recompute
  3. 2026-09-24 18:34 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-23 17:22 UTCGHSA enrichment
  7. 2026-09-23 03:09 UTCEG score recompute
  8. 2026-09-23 03:09 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 01:57 UTCEG score recompute
  11. 2026-09-22 01:57 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 00:46 UTCEG score recompute
  14. 2026-09-21 00:46 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-19 23:34 UTCEG score recompute
  17. 2026-09-19 23:34 UTCGHSA enrichment
  18. 2026-09-18 22:22 UTCEG score recompute
  19. 2026-09-18 22:22 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-17 21:11 UTCEG score recompute
  22. 2026-09-17 21:11 UTCGHSA enrichment
  23. 2026-09-17 19:32 UTCEPSS rescore
  24. 2026-09-16 19:59 UTCEG score recompute
  25. 2026-09-16 19:59 UTCGHSA enrichment
  26. 2026-09-16 14:09 UTCEPSS rescore
  27. 2026-09-16 05:15 UTCEPSS rescore
  28. 2026-09-15 18:35 UTCEG score recompute
  29. 2026-09-15 18:35 UTCGHSA enrichment
  30. 2026-09-15 17:24 UTCEG score recompute
  31. 2026-09-15 17:24 UTCGHSA enrichment
  32. 2026-09-15 03:12 UTCEPSS rescore
  33. 2026-09-14 20:51 UTCGHSA enrichment
  34. 2026-09-13 19:39 UTCEG score recompute
  35. 2026-09-13 19:39 UTCGHSA enrichment
  36. 2026-09-12 18:27 UTCEG score recompute
  37. 2026-09-12 18:12 UTCEG score recompute
  38. 2026-09-12 18:12 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-90557?
CVE-2026-90557 is a medium vulnerability published on September 12, 2026. Freeciv versions 3.1.0 through 3.2.5 contain an out-of-bounds read vulnerability in sgloadplayer_unit() when processing savegame files with invalid unit activity indices. An attacker can craft a malicious savegame file with an out-of-range activity index that bypasses bounds checking and causes a…
When was CVE-2026-90557 disclosed?
CVE-2026-90557 was first published on September 12, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90557 actively exploited?
CVE-2026-90557 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-90557?
CVE-2026-90557 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-90557?
An upstream fix for CVE-2026-90557 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-90557 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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