CVE-2026-63385

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-63385
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63385.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63385
Aliases
  • GHSA-jcwh-pvf2-73p2
Downstream
Published
2026-08-20T17:55:36Z
Modified
2026-09-11T08:36:40Z
Severity
  • 9.2 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N CVSS Calculator
Summary
Libevent: HTTP header handling bugs create risk of access control bypass.
Details

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has two HTTP parsing weaknesses in http.c. evhttp_decode_uri_internal decodes percent-encoded %00 bytes into literal NUL characters, which can cause downstream C string operations to truncate a path and bypass validation performed on a different representation. evhttp_header_is_valid_value also accepts obsolete line folding in header values containing carriage return or line feed characters, allowing a proxy and libevent to interpret headers differently and enabling header injection or access control bypass. The CRLF header acceptance is fixed in versions 2.1.13 and 2.2.2-alpha, but the reviewed patches do not clearly remediate the URI NUL-truncation condition.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-444"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63385.json"
}
References

Affected packages

Git / github.com/libevent/libevent

Affected ranges

Type
GIT
Repo
https://github.com/libevent/libevent
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
df3ecad3a040fd6d4fad4287defe113395de6fd7
Fixed
79ddfb460847999b807cba76d04e73891f29c6ee
Fixed
758be0c0f69c1934ef9a84ab39e9f9e5fde2e6d0
Fixed
9170dd35e64714613e8d13b290587cfc28e258e2
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "2.2.0-alpha"
        },
        {
            "fixed": "2.2.2-alpha"
        },
        {
            "introduced": "0"
        },
        {
            "fixed": "2.1.13"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

release-1.*
release-1.1b
release-2.*
release-2.0.1-alpha
release-2.0.10-stable
release-2.0.3-alpha
release-2.0.4-alpha
release-2.0.5-beta
release-2.0.6-rc
release-2.0.7-rc
release-2.0.8-rc
release-2.0.9-rc
release-2.1.1-alpha
release-2.1.10-stable
release-2.1.11-stable
release-2.1.12-stable
release-2.1.2-alpha
release-2.1.3-alpha
release-2.1.4-alpha
release-2.1.5-beta
release-2.1.6-beta
release-2.1.7-rc
release-2.1.8-stable
release-2.1.9-beta
release-2.2.1-alpha

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63385.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "159443554126248192493229143747497657830",
            "length": 554
        },
        "id": "CVE-2026-63385-09212634",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/df3ecad3a040fd6d4fad4287defe113395de6fd7",
        "target": {
            "file": "test/regress_http.c",
            "function": "http_check_transfer_encoding_test"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "248332385648104782046694678277210168338",
                "61183333473211860754687236167259228973",
                "105978649520773873069646351304692352328",
                "250769086247804005082677166275449811672"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-63385-113b559f",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/9170dd35e64714613e8d13b290587cfc28e258e2",
        "target": {
            "file": "test/regress_http.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "335594123686192924095430681468915382294",
            "length": 237
        },
        "id": "CVE-2026-63385-18a5f683",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/9170dd35e64714613e8d13b290587cfc28e258e2",
        "target": {
            "file": "http.c",
            "function": "evhttp_header_is_valid_value"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "335594123686192924095430681468915382294",
            "length": 237
        },
        "id": "CVE-2026-63385-3e0b8d30",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/758be0c0f69c1934ef9a84ab39e9f9e5fde2e6d0",
        "target": {
            "file": "http.c",
            "function": "evhttp_header_is_valid_value"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "156454671672876299134337389795275260119",
                "156027312396034977093912409873686874581",
                "102722108278382698140429358542757673773",
                "94331243378865506034083474685728319493",
                "141712309207802533389296252575811444198",
                "133457342464639888588708177849864410468",
                "134792771592966456779690561609829698813",
                "210207466198600775572847048660845316437"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-63385-5acea964",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/758be0c0f69c1934ef9a84ab39e9f9e5fde2e6d0",
        "target": {
            "file": "http.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "253573145327419661989798637302208732748",
            "length": 453
        },
        "id": "CVE-2026-63385-8d6343be",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/9170dd35e64714613e8d13b290587cfc28e258e2",
        "target": {
            "file": "test/regress_http.c",
            "function": "http_bad_header_test"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "270762094980121927552802584929566056086",
                "37564212311334647331345684303177453724",
                "168570413533780985513641597969239978857"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-63385-923050c6",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/df3ecad3a040fd6d4fad4287defe113395de6fd7",
        "target": {
            "file": "test/regress_http.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "270762094980121927552802584929566056086",
                "37564212311334647331345684303177453724",
                "168570413533780985513641597969239978857"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-63385-979e5bed",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/79ddfb460847999b807cba76d04e73891f29c6ee",
        "target": {
            "file": "test/regress_http.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "228949190804516355688751677182701710512",
            "length": 507
        },
        "id": "CVE-2026-63385-9d6f7bdc",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/758be0c0f69c1934ef9a84ab39e9f9e5fde2e6d0",
        "target": {
            "file": "test/regress_http.c",
            "function": "http_bad_header_test"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "248332385648104782046694678277210168338",
                "20167817516379386618153487950901174280",
                "295196270722037179760886109700183996570",
                "313871568211194703002041502874636650865",
                "11699147308460220707870682643594677201"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-63385-d4b2fa03",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/758be0c0f69c1934ef9a84ab39e9f9e5fde2e6d0",
        "target": {
            "file": "test/regress_http.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "156454671672876299134337389795275260119",
                "156027312396034977093912409873686874581",
                "102722108278382698140429358542757673773",
                "94331243378865506034083474685728319493",
                "141712309207802533389296252575811444198",
                "133457342464639888588708177849864410468",
                "134792771592966456779690561609829698813",
                "210207466198600775572847048660845316437"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-63385-e7694267",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/9170dd35e64714613e8d13b290587cfc28e258e2",
        "target": {
            "file": "http.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "159443554126248192493229143747497657830",
            "length": 554
        },
        "id": "CVE-2026-63385-ebc5ab94",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/libevent/libevent/commit/79ddfb460847999b807cba76d04e73891f29c6ee",
        "target": {
            "file": "test/regress_http.c",
            "function": "http_check_transfer_encoding_test"
        }
    }
]
vanir_signatures_modified 
"2026-09-11T08:36:40Z"