ubuntu-cve-2026-90557
Vulnerability from osv_ubuntu
Published
2026-09-14 00:00
Modified
2026-09-14 00:00
Summary
Details
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.
Severity
6.1 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "freeciv",
"binary_version": "2.5.3-1"
},
{
"binary_name": "freeciv-client-extras",
"binary_version": "2.5.3-1"
},
{
"binary_name": "freeciv-client-gtk",
"binary_version": "2.5.3-1"
},
{
"binary_name": "freeciv-client-qt",
"binary_version": "2.5.3-1"
},
{
"binary_name": "freeciv-client-sdl",
"binary_version": "2.5.3-1"
},
{
"binary_name": "freeciv-data",
"binary_version": "2.5.3-1"
},
{
"binary_name": "freeciv-server",
"binary_version": "2.5.3-1"
},
{
"binary_name": "freeciv-sound-standard",
"binary_version": "2.5.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "freeciv",
"purl": "pkg:deb/ubuntu/freeciv@2.5.3-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.5.1-1",
"2.5.2-1",
"2.5.3-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "freeciv",
"binary_version": "2.5.10-1"
},
{
"binary_name": "freeciv-client-extras",
"binary_version": "2.5.10-1"
},
{
"binary_name": "freeciv-client-gtk",
"binary_version": "2.5.10-1"
},
{
"binary_name": "freeciv-client-gtk3",
"binary_version": "2.5.10-1"
},
{
"binary_name": "freeciv-client-qt",
"binary_version": "2.5.10-1"
},
{
"binary_name": "freeciv-client-sdl",
"binary_version": "2.5.10-1"
},
{
"binary_name": "freeciv-data",
"binary_version": "2.5.10-1"
},
{
"binary_name": "freeciv-server",
"binary_version": "2.5.10-1"
},
{
"binary_name": "freeciv-sound-standard",
"binary_version": "2.5.10-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "freeciv",
"purl": "pkg:deb/ubuntu/freeciv@2.5.10-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.5.9-1",
"2.5.10-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "freeciv",
"binary_version": "2.6.2-1"
},
{
"binary_name": "freeciv-client-extras",
"binary_version": "2.6.2-1"
},
{
"binary_name": "freeciv-client-gtk",
"binary_version": "2.6.2-1"
},
{
"binary_name": "freeciv-client-gtk3",
"binary_version": "2.6.2-1"
},
{
"binary_name": "freeciv-client-qt",
"binary_version": "2.6.2-1"
},
{
"binary_name": "freeciv-client-sdl",
"binary_version": "2.6.2-1"
},
{
"binary_name": "freeciv-data",
"binary_version": "2.6.2-1"
},
{
"binary_name": "freeciv-server",
"binary_version": "2.6.2-1"
},
{
"binary_name": "freeciv-sound-standard",
"binary_version": "2.6.2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "freeciv",
"purl": "pkg:deb/ubuntu/freeciv@2.6.2-1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.6.0-3",
"2.6.0-4",
"2.6.1-1",
"2.6.2-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "freeciv",
"binary_version": "2.6.6-1"
},
{
"binary_name": "freeciv-client-extras",
"binary_version": "2.6.6-1"
},
{
"binary_name": "freeciv-client-gtk",
"binary_version": "2.6.6-1"
},
{
"binary_name": "freeciv-client-gtk3",
"binary_version": "2.6.6-1"
},
{
"binary_name": "freeciv-client-qt",
"binary_version": "2.6.6-1"
},
{
"binary_name": "freeciv-client-sdl",
"binary_version": "2.6.6-1"
},
{
"binary_name": "freeciv-data",
"binary_version": "2.6.6-1"
},
{
"binary_name": "freeciv-server",
"binary_version": "2.6.6-1"
},
{
"binary_name": "freeciv-sound-standard",
"binary_version": "2.6.6-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "freeciv",
"purl": "pkg:deb/ubuntu/freeciv@2.6.6-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.6.3-1",
"2.6.5-1",
"2.6.6-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "freeciv",
"binary_version": "3.1.0+ds-1build5"
},
{
"binary_name": "freeciv-client-extras",
"binary_version": "3.1.0+ds-1build5"
},
{
"binary_name": "freeciv-client-gtk3",
"binary_version": "3.1.0+ds-1build5"
},
{
"binary_name": "freeciv-client-qt",
"binary_version": "3.1.0+ds-1build5"
},
{
"binary_name": "freeciv-client-sdl",
"binary_version": "3.1.0+ds-1build5"
},
{
"binary_name": "freeciv-data",
"binary_version": "3.1.0+ds-1build5"
},
{
"binary_name": "freeciv-ruleset-tools",
"binary_version": "3.1.0+ds-1build5"
},
{
"binary_name": "freeciv-server",
"binary_version": "3.1.0+ds-1build5"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "freeciv",
"purl": "pkg:deb/ubuntu/freeciv@3.1.0+ds-1build5?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.8-1",
"3.0.8-2",
"3.0.8-2build1",
"3.1.0+ds-1build3",
"3.1.0+ds-1build4",
"3.1.0+ds-1build5"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "freeciv",
"binary_version": "3.2.4+ds-1"
},
{
"binary_name": "freeciv-client-extras",
"binary_version": "3.2.4+ds-1"
},
{
"binary_name": "freeciv-client-gtk3",
"binary_version": "3.2.4+ds-1"
},
{
"binary_name": "freeciv-client-gtk4",
"binary_version": "3.2.4+ds-1"
},
{
"binary_name": "freeciv-client-qt",
"binary_version": "3.2.4+ds-1"
},
{
"binary_name": "freeciv-client-sdl",
"binary_version": "3.2.4+ds-1"
},
{
"binary_name": "freeciv-data",
"binary_version": "3.2.4+ds-1"
},
{
"binary_name": "freeciv-ruleset-tools",
"binary_version": "3.2.4+ds-1"
},
{
"binary_name": "freeciv-server",
"binary_version": "3.2.4+ds-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "freeciv",
"purl": "pkg:deb/ubuntu/freeciv@3.2.4+ds-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.2.0+ds-1",
"3.2.1+ds-1",
"3.2.1+ds-1build1",
"3.2.2+ds-1",
"3.2.4+ds-1"
]
}
],
"aliases": [],
"details": "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.",
"id": "UBUNTU-CVE-2026-90557",
"modified": "2026-09-14T00:00:00Z",
"published": "2026-09-14T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-90557"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-90557"
},
{
"type": "REPORT",
"url": "https://redmine.freeciv.org/issues/2162"
},
{
"type": "REPORT",
"url": "https://github.com/freeciv/freeciv"
},
{
"type": "REPORT",
"url": "https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c#L4282"
},
{
"type": "REPORT",
"url": "https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c#L6108"
},
{
"type": "REPORT",
"url": "https://github.com/freeciv/freeciv/commit/ef0c76c2765fe383140eb1a70dbea1228844152e"
},
{
"type": "REPORT",
"url": "https://github.com/freeciv/freeciv/releases/tag/R3_2_6"
},
{
"type": "REPORT",
"url": "https://www.vulncheck.com/advisories/freeciv-3.1.0-through-3.2.5-out-of-bounds-read-via-savegame"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-90557"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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