CVE-2025-12642

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Source
https://nvd.nist.gov/vuln/detail/CVE-2025-12642
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-12642.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-12642
Downstream
Published
2025-11-03T20:17:06.410Z
Modified
2025-11-20T12:32:41.035976Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
[none]
Details

lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks.

Successful exploitation may allow an attacker to:

  • Bypass access control rules
  • Inject unsafe input into backend logic that trusts request headers
  • Execute HTTP Request Smuggling attacks under some conditions

This issue affects lighttpd1.4.80

References

Affected packages

Git / github.com/lighttpd/lighttpd1.4

Affected ranges

Type
GIT
Repo
https://github.com/lighttpd/lighttpd1.4
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
35cb89c103877de62d6b63d0804255475d77e5e1

Affected versions

lighttpd-1.*

lighttpd-1.3.11
lighttpd-1.3.12
lighttpd-1.3.13
lighttpd-1.3.14
lighttpd-1.3.15
lighttpd-1.3.16
lighttpd-1.4.1
lighttpd-1.4.2
lighttpd-1.4.25
lighttpd-1.4.26
lighttpd-1.4.27
lighttpd-1.4.28
lighttpd-1.4.29
lighttpd-1.4.3
lighttpd-1.4.30
lighttpd-1.4.31
lighttpd-1.4.32
lighttpd-1.4.33
lighttpd-1.4.34
lighttpd-1.4.35
lighttpd-1.4.36
lighttpd-1.4.36--rc1
lighttpd-1.4.37
lighttpd-1.4.38
lighttpd-1.4.39
lighttpd-1.4.4
lighttpd-1.4.40
lighttpd-1.4.41
lighttpd-1.4.42
lighttpd-1.4.43
lighttpd-1.4.44
lighttpd-1.4.45
lighttpd-1.4.46
lighttpd-1.4.47
lighttpd-1.4.48
lighttpd-1.4.49
lighttpd-1.4.5
lighttpd-1.4.50
lighttpd-1.4.51
lighttpd-1.4.52
lighttpd-1.4.53
lighttpd-1.4.54
lighttpd-1.4.55
lighttpd-1.4.56
lighttpd-1.4.56-rc1
lighttpd-1.4.56-rc2
lighttpd-1.4.56-rc3
lighttpd-1.4.56-rc4
lighttpd-1.4.56-rc5
lighttpd-1.4.56-rc6
lighttpd-1.4.56-rc7
lighttpd-1.4.57
lighttpd-1.4.58
lighttpd-1.4.59
lighttpd-1.4.6
lighttpd-1.4.60
lighttpd-1.4.61
lighttpd-1.4.62
lighttpd-1.4.63
lighttpd-1.4.64
lighttpd-1.4.65
lighttpd-1.4.66
lighttpd-1.4.67
lighttpd-1.4.68
lighttpd-1.4.69
lighttpd-1.4.7
lighttpd-1.4.70
lighttpd-1.4.71
lighttpd-1.4.72
lighttpd-1.4.73
lighttpd-1.4.74
lighttpd-1.4.75
lighttpd-1.4.76
lighttpd-1.4.77
lighttpd-1.4.78
lighttpd-1.4.79
lighttpd-1.4.80

Database specific

vanir_signatures

[
    {
        "target": {
            "file": "src/request.c"
        },
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "177279775846748800587473156359973412692",
                "234107947651447384615462498936120486077",
                "302025777481488930004506134913590170429",
                "53861381006875801283685841489596921050"
            ]
        },
        "signature_version": "v1",
        "id": "CVE-2025-12642-473a78bc",
        "source": "https://github.com/lighttpd/lighttpd1.4/commit/35cb89c103877de62d6b63d0804255475d77e5e1",
        "deprecated": false,
        "signature_type": "Line"
    }
]