CVE-2026-76875

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Source

https://cve.org/CVERecord?id=CVE-2026-76875

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-76875.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-76875

Downstream

Published

2026-09-29T12:45:19Z

Modified

2026-10-21T03:00:55Z

Severity

6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

PyPy pyexpat ExternalEntityParserCreate Use-After-Free

Details

PyPy before versions 3.11.16 and 3.12.14 contains a use-after-free vulnerability in the pyexpat module's ExternalEntityParserCreate function that allows attackers to corrupt memory by supplying a crafted XML document to applications that create external-entity sub-parsers without retaining a reference to the parent parser. The child parser retains a raw C back-pointer to the parent parser struct while PyPy's tracing garbage collector can free the parent's C struct, causing bundled libexpat to dereference the freed pointer on every parsed token, producing memory corruption.

Database specific

{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-416"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76875.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "3.11.16"
                        },
                        {
                            "introduced":  "3.12.0"
                        },
                        {
                            "fixed":  "3.12.14"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "StandardRange"
                }
            ]
        },
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "3.11.16"
                        }
                    ],
                    "source":  "DESCRIPTION"
                }
            ]
        }
    ]
}

References

Affected packages

Git / github.com/pypy/pypy

Affected ranges

Type

GIT

Repo

https://github.com/pypy/pypy

Events

Introduced

Fixed

e778e9989a677fe281a9e2ae3447e213afcc875c

Fixed

78565394c9b55004add6156e0cc6d32eaf63dcc8

Database specific

Show details

{
    "extracted_events":  [
        {
            "original_tag":  "release-pypy3.12-v8.0.0",
            "range":  [
                {
                    "fixed":  "e778e9989a677fe281a9e2ae3447e213afcc875c"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "release-pypy3.11-v8.0.0",
            "range":  [
                {
                    "fixed":  "78565394c9b55004add6156e0cc6d32eaf63dcc8"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

release-1.*

release-1.5

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-76875.json"