CVE-2026-91855

Source
https://cve.org/CVERecord?id=CVE-2026-91855
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91855.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-91855
Published
2026-09-15T16:45:07Z
Modified
2026-10-28T11:19:38Z
Severity
  • 5.5 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P CVSS Calculator
Summary
Open5GS PFCP Message handler.c denial of service
Details

A security flaw has been discovered in Open5GS up to 2.7.7. Affected by this vulnerability is an unknown functionality of the file lib/pfcp/handler.c of the component PFCP Message Handler. Performing a manipulation results in denial of service. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks. The patch is named 028e1dbb5e3271035ccee906ef417a97fc523f71. Applying a patch is the recommended action to fix this issue. CVE-2025-29339 describes a different assertion failure vulnerability in Open5GS UPF.

Database specific
{
    "cna_assigner":  "VulDB",
    "cwe_ids":  [
        "CWE-404"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91855.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "introduced":  "2.7.3"
                        },
                        {
                            "last_affected":  "2.7.3"
                        },
                        {
                            "introduced":  "2.7.4"
                        },
                        {
                            "last_affected":  "2.7.4"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "StandaloneSingleVersion"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/open5gs/open5gs

Affected ranges

Type
GIT
Repo
https://github.com/open5gs/open5gs
Events
Database specific
Show details
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "2.7.0"
                },
                {
                    "last_affected":  "2.7.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandaloneSingleVersion"
        },
        {
            "range":  [
                {
                    "introduced":  "2.7.1"
                },
                {
                    "last_affected":  "2.7.1"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandaloneSingleVersion"
        },
        {
            "range":  [
                {
                    "introduced":  "2.7.2"
                },
                {
                    "last_affected":  "2.7.2"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandaloneSingleVersion"
        },
        {
            "range":  [
                {
                    "introduced":  "2.7.5"
                },
                {
                    "last_affected":  "2.7.5"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandaloneSingleVersion"
        },
        {
            "range":  [
                {
                    "introduced":  "2.7.6"
                },
                {
                    "last_affected":  "2.7.6"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandaloneSingleVersion"
        },
        {
            "range":  [
                {
                    "introduced":  "2.7.7"
                },
                {
                    "last_affected":  "2.7.7"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandaloneSingleVersion"
        },
        {
            "range":  [
                {
                    "fixed":  "028e1dbb5e3271035ccee906ef417a97fc523f71"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

2.*
2.7.0
2.7.1
2.7.2
2.7.5
2.7.6
2.7.7
v2.*
v2.7.0
v2.7.1
v2.7.2
v2.7.7
v2.8.0

Database specific

source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91855.json"
vanir_signatures
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "230545453255873729189827836366960241647",
            "length":  744
        },
        "id":  "CVE-2026-91855-0e67bc66",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "lib/pfcp/context.c",
            "function":  "ogs_pfcp_setup_pdr_gtpu_node"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "254319519912905455462299230538024998175",
            "length":  4292
        },
        "id":  "CVE-2026-91855-1f25bd3a",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "src/sgwu/sxa-handler.c",
            "function":  "sgwu_sxa_handle_session_modification_request"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "126489484860550904453564432690787272139",
            "length":  4987
        },
        "id":  "CVE-2026-91855-4ca55328",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "src/upf/n4-handler.c",
            "function":  "upf_n4_handle_session_modification_request"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "210090259689515600951236313722871421002",
            "length":  4078
        },
        "id":  "CVE-2026-91855-52b6632f",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "src/upf/n4-handler.c",
            "function":  "upf_n4_handle_session_establishment_request"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "326343499815558128090961952471220455110",
                "268454131294937335444603814139258982509",
                "276091957610795965994776802693919891078",
                "307091394461657070776238610901722595079"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-91855-7b697355",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "src/sgwu/sxa-handler.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "309474640871951335070823968950859545292",
                "82602333344607486654006609607252086258",
                "164020309649031385095752972422973768260",
                "240285105475084501070949595922154754684",
                "309474640871951335070823968950859545292",
                "82602333344607486654006609607252086258",
                "164020309649031385095752972422973768260",
                "240285105475084501070949595922154754684"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-91855-9a99efa2",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "lib/pfcp/context.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "212299393228737724976784488861918411591",
            "length":  2392
        },
        "id":  "CVE-2026-91855-a5e83405",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "lib/pfcp/handler.c",
            "function":  "ogs_pfcp_handle_create_far"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "241144325863279876339122522060877818981",
            "length":  657
        },
        "id":  "CVE-2026-91855-a8bbc7de",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "lib/pfcp/context.c",
            "function":  "ogs_pfcp_setup_far_gtpu_node"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "137724495931723198850055789331741743073",
                "88783401803101748053881006623844741796",
                "108657516588713475212328728068102050809",
                "31434271374179997559153935999751768083",
                "28615813239261532732994134129636992332",
                "288067726668032505297611147897858213650",
                "62170415614142711629619224000791229578",
                "168408139644031092740684784916896283042",
                "312711795957172146392856098943283027364",
                "329615666235087495452115722048443336738",
                "143166375258817315960414397611828728374",
                "17853520726974668369536903805102068343",
                "186400941776807863431172556265364296191",
                "226451177130252279789909150631376291334",
                "325685008024968204826317052991207942051",
                "315136655843945200505381941788937890435",
                "62726077703516887068027324794521097704",
                "203525722170605199220521857480373440045",
                "203456631922506332840281207396348427070",
                "142207365057600856894623286805361623812",
                "295651741198405335237177432815584841979",
                "334980467557475235968050876426850812168",
                "78563920018197662207235029018707345622",
                "30410721011809447722916163307448523532",
                "168408139644031092740684784916896283042",
                "312711795957172146392856098943283027364",
                "329615666235087495452115722048443336738",
                "143166375258817315960414397611828728374",
                "17853520726974668369536903805102068343",
                "186400941776807863431172556265364296191",
                "226451177130252279789909150631376291334",
                "325685008024968204826317052991207942051",
                "315136655843945200505381941788937890435",
                "62726077703516887068027324794521097704",
                "203525722170605199220521857480373440045",
                "203456631922506332840281207396348427070",
                "142207365057600856894623286805361623812",
                "295651741198405335237177432815584841979"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-91855-ca3f4598",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "lib/pfcp/handler.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "270178608898049280600493865307654661348",
                "243509394819193703705020878439989244056",
                "304952245024023898305818353672803241504",
                "307091394461657070776238610901722595079",
                "270178608898049280600493865307654661348",
                "243509394819193703705020878439989244056",
                "304952245024023898305818353672803241504",
                "307091394461657070776238610901722595079"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-91855-cd2a1fea",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "src/upf/n4-handler.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "336749403839023334325156493536652064967",
            "length":  2179
        },
        "id":  "CVE-2026-91855-e7d354bc",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71",
        "target":  {
            "file":  "lib/pfcp/handler.c",
            "function":  "ogs_pfcp_handle_update_far"
        }
    }
]
vanir_signatures_modified
"2026-10-28T11:19:38Z"