PSF-0000-CVE-2026-82049

See a problem?
Import Source
https://github.com/psf/advisory-database/blob/main/advisories/python/PSF-0000-CVE-2026-82049.json
JSON Data
https://api.osv.dev/v1/vulns/PSF-0000-CVE-2026-82049
Aliases
Published
2026-09-14T19:14:03Z
Modified
2026-09-14T20:10:36Z
Summary
[none]
Details

In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree.

Database specific 
{
    "cwe_ids": []
}
References

Affected packages

Git / github.com/python/cpython

Affected ranges

Type
GIT
Repo
https://github.com/python/cpython
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
5a57248b22ad3b9aafcaaadae2c304a1923daeca

Affected versions

v0.*
v0.9.8
v0.9.9
v1.*
v1.0.1
v1.0.2
v1.1
v1.1.1
v1.2
v1.2b1
v1.2b2
v1.2b3
v1.2b4
v1.3
v1.3b1
v1.4
v1.4b1
v1.4b2
v1.4b3
v1.5
v1.5.1
v1.5.2
v1.5.2a1
v1.5.2a2
v1.5.2b1
v1.5.2b2
v1.5.2c1
v1.5a1
v1.5a2
v1.5a3
v1.5a4
v1.5b1
v1.5b2
v1.6a1
v1.6a2
v2.*
v2.0
v2.0b1
v2.0b2
v2.0c1
v2.1
v2.1a1
v2.1a2
v2.1b1
v2.1b2
v2.1c1
v2.1c2
v2.2a3
v2.3c1
v2.3c2
v2.4
v2.4a1
v2.4a2
v2.4a3
v2.4b1
v2.4b2
v2.4c1
v3.*
v3.0a1
v3.0a2
v3.0a3
v3.0a4
v3.0a5
v3.0b1
v3.0b2
v3.0b3
v3.0rc1
v3.0rc2
v3.0rc3
v3.1
v3.10.0a1
v3.10.0a7
v3.11.0a3
v3.11.0a4
v3.11.0a5
v3.11.0a6
v3.11.0a7
v3.11.0b1
v3.12.0a1
v3.12.0a2
v3.12.0a3
v3.12.0a4
v3.12.0a5
v3.12.0a6
v3.12.0a7
v3.12.0b1
v3.13.0a1
v3.13.0a2
v3.13.0a3
v3.13.0a4
v3.13.0a5
v3.13.0a6
v3.13.0b1
v3.14.0a1
v3.14.0a2
v3.14.0a3
v3.14.0a4
v3.14.0a5
v3.14.0a6
v3.14.0a7
v3.1a1
v3.1a2
v3.1b1
v3.1rc1
v3.1rc2
v3.2a1
v3.2a2
v3.2a3
v3.2a4
v3.2b1
v3.2b2
v3.2rc1
v3.2rc2
v3.2rc3
v3.3.0a2
v3.3.0a3
v3.3.0a4
v3.3.0b1
v3.3.0b2
v3.3.0rc1
v3.3.0rc2
v3.3.0rc3
v3.4.0a1
v3.4.0a2
v3.4.0a3
v3.4.0a4
v3.4.0b1
v3.4.0b2
v3.4.0b3
v3.5.0a1
v3.5.0a2
v3.5.0a3
v3.5.0a4
v3.5.0b1
v3.6.0a3
v3.6.0b1
v3.7.0a2
v3.9.0a2

Database specific

source 
"https://github.com/psf/advisory-database/blob/main/advisories/python/PSF-0000-CVE-2026-82049.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "267959810012917770400690325238361302404",
            "length": 1834
        },
        "id": "PSF-0000-CVE-2026-82049-0287fda3",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca",
        "target": {
            "file": "Modules/posixmodule.c",
            "function": "os_symlink_impl"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "84214301494753001192888032913794937585",
                "41820490358286174222816075072646282822",
                "273419541879179450879866280856998132849",
                "160074586628009698771565341913161200058",
                "285542558134630096667834399153434937624",
                "95809919400751122606823033150957223699",
                "205355179740128963671618134888183651889",
                "289978647606376248309152325909124168419"
            ],
            "threshold": 0.9
        },
        "id": "PSF-0000-CVE-2026-82049-03669b97",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca",
        "target": {
            "file": "Modules/clinic/posixmodule.c.h"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "155770192408540012751021593359598745768",
            "length": 1834
        },
        "id": "PSF-0000-CVE-2026-82049-05c31dff",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca",
        "target": {
            "file": "Modules/clinic/posixmodule.c.h",
            "function": "os_link"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "203424791401373496045590391218869865705",
                "313079788090789726122159250470243304044",
                "237403817052961879920167401361366969995",
                "101439833449485421617063933278822806943",
                "12490333274840592807265937885357558576",
                "264431914624868132810463621464930909438",
                "123316591950073319570860478623297113427",
                "116203552124651182052084036787769804793",
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                "280739953835892540517752098634947259736",
                "105733832417777969738272284074996172457",
                "99822774897598718637573640037692290109",
                "211134274670953056070986941618821441490",
                "67046948812929158767660561956935670267",
                "208959891089041310964022438250938767999",
                "255473495192449174325830428891450179669",
                "179298131828077067486928114420023927128",
                "262542643625373520623077720862038664032",
                "214005891481496413566509830760452257363",
                "302365271359307276180250215863862971345",
                "226076795346784479966366381806937975762",
                "62883986758050273003566039469640760223",
                "67086347400937215842840498353998932318",
                "295507655888536602034544638049242269277",
                "13828991224579563758415941228328663113",
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                "141814318202201729125254407378130361004",
                "98402834040705734929136251820299953234",
                "265378927170351459319686720672730588998",
                "43772310371581454102349126441616598847",
                "109617800509052927117376120082287039209",
                "128392366501938626702132264483095032303",
                "33786832729959356854284186128653483420",
                "259586006219542252760222339155765531779",
                "190359421230921045605483850730147563107",
                "207829324267667416446376513298159750051",
                "112101083800343848386420737755953854968",
                "145691250165199375913340985234214485812",
                "71846497447566257206836217155840432520",
                "111781562327111901435803968549474663044",
                "293011440281289237335319891999287686387",
                "76949906967122270846545604202931712666",
                "68548996976066696686926919400924937596",
                "162553950198253833581359178969179618782",
                "298463966982082737810995120983889078115",
                "211626883684831996526311642383641804594",
                "139822868071513177808439850508281300823",
                "16111072626440697363323075176238003405",
                "335321198478416727494434298753925803633",
                "178528520044192166307250074171208980140",
                "4544111393618610573014631413676193190",
                "312760904726209197309373779437519011399",
                "323717220786171848388476504517209503983",
                "143020453670807975619238195962928248769",
                "326028688853017099944501026277521891316",
                "239644462175867125428438233039224081569",
                "181143033114746841424326967779776977534",
                "271266568863838759231241171940671621635",
                "102083408656890282324489806785264895354",
                "185106787041331990927351312596553777246",
                "42814679058687648993325212295210940143",
                "52938278578312489992361417024250612247",
                "294159336367666910694871408087919496191",
                "209886228092566369685295756805883614242",
                "290495828566685465131074891424079105299",
                "217091734582334569644588361808542029166",
                "152504578666146781147681332475587982648",
                "190981149355808952923904101378361956377",
                "293185464402666286521481061449015989440",
                "195212475728559534436945791554389338302",
                "171567684014406604562465682193377382246",
                "313802588904198001754198445410328586280",
                "163337599658659815753087465674058202175",
                "57081688230146547022366944769926565344",
                "170472299840265806738760471649788138457",
                "123264652703492928731334141227959584743",
                "293185464402666286521481061449015989440",
                "99996592912685908450682918727202438946",
                "36580374731113901357836134457673797159",
                "150896569229729246430339978801704232328",
                "18898566074600344622281036429171220543",
                "75183871821927807201510208195830184460",
                "269701731251847493160270887566608944997",
                "294811852134562161863889822351365884972"
            ],
            "threshold": 0.9
        },
        "id": "PSF-0000-CVE-2026-82049-45e38458",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca",
        "target": {
            "file": "Modules/posixmodule.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "12855332029521926307782785870798858747",
            "length": 1729
        },
        "id": "PSF-0000-CVE-2026-82049-76a27062",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca",
        "target": {
            "file": "Modules/posixmodule.c",
            "function": "os_link_impl"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "253628542589482117839778400615606067596",
            "length": 1455
        },
        "id": "PSF-0000-CVE-2026-82049-f84176d6",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca",
        "target": {
            "file": "Modules/posixmodule.c",
            "function": "internal_rename"
        }
    }
]
vanir_signatures_modified 
"2026-09-14T20:09:11Z"