CVE-2026-66357

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Source
https://cve.org/CVERecord?id=CVE-2026-66357
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66357.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-66357
Aliases
Downstream
Published
2026-09-01T14:40:50.526Z
Modified
2026-09-03T03:48:19.650933345Z
Severity
  • 8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:L/SA:N CVSS Calculator
Summary
inets,httpd:HTTP Request Smuggling via obs-fold Header Continuation
Details

httpd has never implemented obs-fold (RFC 2616 §2.2 / RFC 7230 §3.2.4 header continuation lines). Every CRLF followed by a non-CRLF octet unconditionally starts a new header. This missing feature became a security concern as the understanding of HTTP request smuggling attacks evolved.

This issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66357.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "17.0"
                },
                {
                    "fixed": "27.3.4.17"
                },
                {
                    "introduced": "28.0"
                },
                {
                    "fixed": "28.5.0.6"
                },
                {
                    "introduced": "29.0"
                },
                {
                    "fixed": "29.0.6"
                },
                {
                    "introduced": "5.10"
                },
                {
                    "fixed": "9.3.2.7"
                },
                {
                    "introduced": "9.4"
                },
                {
                    "fixed": "9.6.2.3"
                },
                {
                    "introduced": "9.7"
                },
                {
                    "fixed": "9.7.2"
                },
                {
                    "introduced": "84adefa331c4159d432d22840663c38f155cd4c1"
                },
                {
                    "fixed": "*"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "extracted_events": [
                {
                    "fixed": "27.3.4.17"
                },
                {
                    "introduced": "28.0"
                },
                {
                    "fixed": "28.5.0.6"
                },
                {
                    "introduced": "29.0"
                },
                {
                    "fixed": "29.0.6"
                }
            ]
        },
        {
            "source": "DESCRIPTION",
            "extracted_events": [
                {
                    "introduced": "17.0"
                },
                {
                    "introduced": "28.0"
                },
                {
                    "introduced": "29.0"
                },
                {
                    "introduced": "5.10"
                },
                {
                    "fixed": "9.3.2.7"
                },
                {
                    "introduced": "9.4"
                },
                {
                    "fixed": "9.6.2.3"
                },
                {
                    "introduced": "9.7"
                },
                {
                    "fixed": "9.7.2"
                },
                {
                    "fixed": "5.10"
                }
            ]
        }
    ],
    "cna_assigner": "EEF",
    "cwe_ids": [
        "CWE-444"
    ]
}
References

Affected packages

Git / github.com/erlang/otp

Affected ranges

Type
GIT
Repo
https://github.com/erlang/otp
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
220d618d2479a7180b4a06d0c5aacfaa4af4a85b
Fixed
273d8958de38ff2a7fe0c5dcc5b6bfe6f65717f3
Fixed
e640d599287d2eba919e6f13b91f042d7dbe6ff4
Database specific
Show details 
{
    "source": "REFERENCES"
}

Affected versions

OTP-17.*
OTP-17.0
OTP-18.*
OTP-18.0
OTP-18.0-rc1
OTP-19.*
OTP-19.0
OTP-19.0-rc1
OTP-19.0-rc2
OTP-20.*
OTP-20.0
OTP-20.0-rc1
OTP-20.0-rc2
OTP-21.*
OTP-21.0
OTP-21.0-rc1
OTP-21.0-rc2
OTP-22.*
OTP-22.0
OTP-22.0-rc1
OTP-22.0-rc2
OTP-22.0-rc3
OTP-23.*
OTP-23.0
OTP-23.0-rc1
OTP-23.0-rc2
OTP-23.0-rc3
OTP-24.*
OTP-24.0
OTP-24.0-rc1
OTP-24.0-rc2
OTP-24.0-rc3
OTP-25.*
OTP-25.0
OTP-25.0-rc1
OTP-25.0-rc2
OTP-25.0-rc3
OTP-26.*
OTP-26.0
OTP-26.0-rc1
OTP-26.0-rc2
OTP-26.0-rc3
OTP-27.*
OTP-27.0
OTP-27.0-rc1
OTP-27.0-rc2
OTP-27.0-rc3
OTP-27.1
OTP-27.2
OTP-27.3
OTP-27.3.1
OTP-27.3.2
OTP-27.3.3
OTP-27.3.4
OTP-27.3.4.1
OTP-27.3.4.10
OTP-27.3.4.11
OTP-27.3.4.12
OTP-27.3.4.13
OTP-27.3.4.14
OTP-27.3.4.2
OTP-27.3.4.3
OTP-27.3.4.4
OTP-27.3.4.5
OTP-27.3.4.6
OTP-27.3.4.7
OTP-27.3.4.8
OTP-27.3.4.9
OTP-28.*
OTP-28.0
OTP-28.0-rc1
OTP-28.0-rc2
OTP-28.0-rc3
OTP-28.0-rc4
OTP-28.1
OTP-28.4
OTP-28.5
OTP-28.5.0.1
OTP-28.5.0.2
OTP-29.*
OTP-29.0
OTP-29.0-rc1
OTP-29.0-rc2
OTP-29.0-rc3
OTP-29.0.1
OTP-29.0.2
OTP_17.*
OTP_17.0-rc1
OTP_17.0-rc2
Other
OTP_R13B03
OTP_R13B04
OTP_R14A
OTP_R14B
OTP_R14B01
OTP_R14B02
OTP_R14B03
OTP_R15A
OTP_R15B
OTP_R16A_RELEASE_CANDIDATE
OTP_R16B
patch-base-27
patch-base-28

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66357.json"