Out-of-bounds Read in Freeciv
CVE-2026-90557
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/freeciv/freeciv (product)
- github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c (technical-description)
- github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c (technical-description)
- github.com/freeciv/freeciv/commit/ef0c76c2765fe383140eb1a70dbea1228844152e (patch)
- github.com/freeciv/freeciv/releases/tag/R3_2_6 (release-notes)
- redmine.freeciv.org/issues/2162 (issue-tracking)
- www.vulncheck.com/advisories/freeciv-3.1.0-through-3.2.5-out-of-bounds-read-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-90557?
- CVE-2026-90557 is a medium-severity vulnerability in Freeciv, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-09-12.
- How severe is CVE-2026-90557?
- Medium severity. CVSS v3 base score is 6.1 out of 10.