CVE-2026-22776

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.1, a Denial of Service (DoS) vulnerability exists in cpp-httplib due to the unsafe handling of compressed HTTP request bodies (Content-Encoding: gzip, br, etc.). The library validates the payload_max_length against the compressed data size received from the network, but does not limit the size of the decompressed data stored in memory.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-409"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22776.json"
}

References

Affected packages

Git / github.com/yhirose/cpp-httplib

Affected ranges

Type

GIT

Repo

https://github.com/yhirose/cpp-httplib

Events

Introduced

Fixed

bd95e67c234930cd6d6bb11309588c5462c63cec

Fixed

2e2e47bab1ae6a853476eecbc4bf279dd1fef792

Database specific

Show details

{
    "cpe": "cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.30.1"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v0.*

v0.10.0

v0.10.1

v0.10.2

v0.10.3

v0.10.4

v0.10.5

v0.10.6

v0.10.7

v0.10.8

v0.10.9

v0.11.0

v0.11.1

v0.11.2

v0.11.3

v0.11.4

v0.12.0

v0.12.1

v0.12.2

v0.12.3

v0.12.4

v0.12.5

v0.12.6

v0.13.0

v0.13.1

v0.13.2

v0.13.3

v0.14.0

v0.14.1

v0.14.2

v0.14.3

v0.15.0

v0.15.1

v0.15.2

v0.15.3

v0.16.0

v0.16.1

v0.16.2

v0.16.3

v0.17.0

v0.17.1

v0.17.2

v0.17.3

v0.18.0

v0.18.1

v0.18.2

v0.18.3

v0.18.4

v0.18.5

v0.18.6

v0.18.7

v0.19.0

v0.2.0

v0.2.1

v0.2.2

v0.2.3

v0.2.4

v0.2.5

v0.2.6

v0.20.0

v0.20.1

v0.21.0

v0.22.0

v0.23.0

v0.23.1

v0.24.0

v0.25.0

v0.26.0

v0.27.0

v0.28.0

v0.29.0

v0.3.0

v0.3.1

v0.3.2

v0.3.3

v0.30.0

v0.4.0

v0.4.1

v0.4.2

v0.5.0

v0.5.1

v0.5.10

v0.5.11

v0.5.12

v0.5.13

v0.5.2

v0.5.3

v0.5.4

v0.5.5

v0.5.6

v0.5.7

v0.5.8

v0.5.9

v0.6.0

v0.6.1

v0.6.2

v0.6.3

v0.6.4

v0.6.5

v0.6.6

v0.6.7

v0.7.0

v0.7.1

v0.7.10

v0.7.11

v0.7.12

v0.7.13

v0.7.14

v0.7.15

v0.7.16

v0.7.17

v0.7.18

v0.7.2

v0.7.3

v0.7.4

v0.7.5

v0.7.6

v0.7.7

v0.7.8

v0.7.9

v0.8.0

v0.8.1

v0.8.2

v0.8.3

v0.8.4

v0.8.5

v0.8.6

v0.8.7

v0.8.8

v0.8.9

v0.9.0

v0.9.1

v0.9.10

v0.9.2

v0.9.3

v0.9.4

v0.9.5

v0.9.6

v0.9.7

v0.9.8

v0.9.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-22776.json"

vanir_signatures

[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "218099892839646534554842095756243613116",
                "7621869220911498893984388739403820609",
                "90496193422603873710275297506514275194",
                "320926213436950818523683172972422008144",
                "64440800842437551768590624981444787950"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-22776-58637582",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/yhirose/cpp-httplib/commit/2e2e47bab1ae6a853476eecbc4bf279dd1fef792",
        "target": {
            "file": "httplib.h"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "138949788160032023022680722052479401795",
            "length": 1647
        },
        "id": "CVE-2026-22776-c5752c67",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/yhirose/cpp-httplib/commit/2e2e47bab1ae6a853476eecbc4bf279dd1fef792",
        "target": {
            "file": "httplib.h",
            "function": "Server::read_content"
        }
    }
]

vanir_signatures_modified

"2026-08-12T10:59:20Z"