CVE-2026-33250

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Source
https://cve.org/CVERecord?id=CVE-2026-33250
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33250.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33250
Aliases
  • GHSA-f76g-6w3f-f6r3
Downstream
Related
Published
2026-03-23T23:38:02.070Z
Modified
2026-07-15T17:36:08.285750Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Crash when receiving specially-crafted packets
Details

Freeciv21 is a free open source, turn-based, empire-building strategy game. Versions prior to 3.1.1 crash with a stack overflow when receiving specially-crafted packets. A remote attacker can use this to take down any public server. A malicious server can use this to crash the game on the player's machine. Authentication is not needed and, by default, logs do not contain any useful information. All users should upgrade to Freeciv21 version 3.1.1. Running the server behind a firewall can help mitigate the issue for non-public servers. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33250.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-121",
        "CWE-20"
    ]
}
References

Affected packages

Git / github.com/longturn/freeciv21

Affected ranges

Type
GIT
Repo
https://github.com/longturn/freeciv21
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
ad8e18ca22595529599782b2984bf44df8d69ed6
Fixed
9a8796f06beef1d58d206ecc6d2dc2ddb333498e
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.1.1"
        }
    ]
}

Affected versions

v3.*
v3.0-alpha.1
v3.0-alpha.10
v3.0-alpha.2
v3.0-alpha.3
v3.0-alpha.4
v3.0-alpha.5
v3.0-alpha.6
v3.0-alpha.7
v3.0-alpha.8
v3.0-alpha.9
v3.0-beta.1
v3.0-beta.2
v3.0-beta.3
v3.0-beta.4
v3.0-beta.5
v3.0-beta.6
v3.0-beta.7
v3.0-rc.1
v3.1-alpha.1
v3.1-alpha.2
v3.1-alpha.3
v3.1-alpha.4
v3.1-alpha.5
v3.1-beta.1
v3.1-beta.2
v3.1-rc.1
v3.1-rc.2
v3.1-rc.3
v3.1-rc.4
v3.1.0
v3.2-dev.1
v3.2-dev.2

Database specific

vanir_signatures 
[
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "176950745718952962578513946566915388887",
                "163533050068665591142666189019279091535",
                "59078141566895626810274043893642680900",
                "26780643050044632950079218961420445438"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/longturn/freeciv21/commit/9a8796f06beef1d58d206ecc6d2dc2ddb333498e",
        "signature_type": "Line",
        "target": {
            "file": "common/networking/packets.h"
        },
        "id": "CVE-2026-33250-2965d049",
        "deprecated": false
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "33293578290326016501507054572433959677",
                "269816716995662171530982480818722424371",
                "140300060392246076799904857442219449983",
                "152308080587707297035468140787653013071",
                "261747669792107267696119433796043380070",
                "297306324485937089796873314828518528839",
                "338788184095469985415832242102532832453",
                "275002003299902787946256767626930596729",
                "63692657311105796734738026476490173923",
                "74437584371346105623909104247447902955",
                "34186098369825343221400744363201753626",
                "288884641656658678637055046597899690746",
                "191509910056740453361654743260799018586",
                "334652294686718209946750484121514567832",
                "321675907509677726908154235444821795877",
                "3947567446502817790356074011328439573",
                "278133839031964716615888639484590850917",
                "17545195357911787417656321187655498562",
                "293417870149835479400399022975848648541",
                "217307997682414814580707686745231885143",
                "327505519771907982733263574987162410232",
                "253283751927868058486128238673521769632",
                "154407413755024018471202259197574308839",
                "279802111576035345940021649941073025966",
                "208177667470433948775912174358245371161",
                "114691444696691270238836857412715639739",
                "266777678982205413264031755754580057429",
                "154423821899662474191500203270710538795",
                "79201410450202488383277650527240988666",
                "44701929295545007825787796538903761107",
                "190046190637949102978542286876596140168",
                "308477187641534915225048070550615674741",
                "76622696084446023207582860791586734060",
                "218212363570418333619682298213867978397",
                "132105220212020086130962205379950096507",
                "263654061684555951951738811314913299409",
                "317709043993099430405156836836933185087",
                "147060492992525396662210855245680562575",
                "260739624738921245335689132648205079809",
                "18709077614994128056093389106729373837",
                "297359725127762203976743244587061695901",
                "328789093106225214607995392446904764442",
                "240159284144289523151737912371692113627",
                "51318335321809266102273166132438999666",
                "55139830485937858510191280546924479021",
                "286526929749343632674524243682907028178",
                "257356540000177450268134095667857454452",
                "183611452861541289972516676618784508115",
                "20399384234155921867861515734624565328",
                "214343692490029045875478837420513468220",
                "313918413087978720302672491800709604477",
                "20985175967256117730725162142580039087",
                "173796533480495507698280214772759683640",
                "194651047194327242172088146412191248708",
                "249415462868908430076162507685768507731",
                "110669815662316197099908950085618905527",
                "321420851591928895459157343979111227196",
                "261436128914404213857387373282176014702",
                "249867940396724153454597852072169958626",
                "324781268532262996181320953184470058737",
                "244748436927257514812749434071681409716",
                "115565276308274320796634846157046012839",
                "277429046163138895013805766023123516193",
                "47942193096033405030943446647090081588",
                "158847599061459994063088568149693586040",
                "323037217210925194022272309989422182215",
                "16946988585049661882055629941418870189",
                "150990654511116577363555115834435483845",
                "6817237721473703158598869633692581157",
                "318335780701730945685454834460440062769",
                "44401594414225608480175904844866040444",
                "299556638479543123488572921908061998493",
                "286968091435378018789203122605598837533",
                "141918692859445886409820161731180987168",
                "307783587709890800495514488775793623564",
                "219235947479731836201875954615361612251",
                "213005913997251383882062412797007962382",
                "274089065832127979420042298478910503154",
                "278187435443313788897188662674097717426",
                "103074909417849045391449842668126377840",
                "149567889939496362890574562254065066659",
                "70671224901813128139949956254752673352",
                "129254633597386821342159576932071049510",
                "36160595464714312187608100456008959423",
                "91276346055989318924672579982967771508",
                "252971426614971735945352434238328763147",
                "195705407739971355240914717960781042769",
                "158321348250699361095872504158022087613",
                "300169191386231897655359897412289897434",
                "77608702290722836428120940763821046406",
                "204038547819676700496644676883073937054",
                "243069725404234646480396014041838048481",
                "234141132183205389248313413924414348860",
                "245603913903272113992155023141633786742"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/longturn/freeciv21/commit/ad8e18ca22595529599782b2984bf44df8d69ed6",
        "signature_type": "Line",
        "target": {
            "file": "common/networking/packets.cpp"
        },
        "id": "CVE-2026-33250-907c1194",
        "deprecated": false
    },
    {
        "digest": {
            "length": 4659.0,
            "function_hash": "191354267178639079908234560734691745219"
        },
        "signature_version": "v1",
        "source": "https://github.com/longturn/freeciv21/commit/9a8796f06beef1d58d206ecc6d2dc2ddb333498e",
        "signature_type": "Function",
        "target": {
            "function": "get_packet_from_connection_raw",
            "file": "common/networking/packets.cpp"
        },
        "id": "CVE-2026-33250-9145c54c",
        "deprecated": false
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "269816716995662171530982480818722424371",
                "140300060392246076799904857442219449983",
                "152308080587707297035468140787653013071",
                "261747669792107267696119433796043380070",
                "7831356056681178836703177247969493207",
                "114691444696691270238836857412715639739",
                "266777678982205413264031755754580057429",
                "315094267057618649290315002510695398053",
                "77608702290722836428120940763821046406",
                "204038547819676700496644676883073937054",
                "243069725404234646480396014041838048481",
                "234141132183205389248313413924414348860"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/longturn/freeciv21/commit/9a8796f06beef1d58d206ecc6d2dc2ddb333498e",
        "signature_type": "Line",
        "target": {
            "file": "common/networking/packets.cpp"
        },
        "id": "CVE-2026-33250-ac225619",
        "deprecated": false
    },
    {
        "digest": {
            "length": 4642.0,
            "function_hash": "325326621537006826921682855208040310723"
        },
        "signature_version": "v1",
        "source": "https://github.com/longturn/freeciv21/commit/ad8e18ca22595529599782b2984bf44df8d69ed6",
        "signature_type": "Function",
        "target": {
            "function": "get_packet_from_connection_raw",
            "file": "common/networking/packets.cpp"
        },
        "id": "CVE-2026-33250-cce3e3be",
        "deprecated": false
    }
]
vanir_signatures_modified 
"2026-07-15T17:36:08Z"
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33250.json"