Vulnerability Instance

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{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/66631?format=api",
    "vulnerability_id": "VCID-2wmc-yahz-pbcj",
    "summary": "Improper Handling of Highly Compressed Data (Compression Bomb) vulnerability in Erlang OTP ssh (ssh_transport modules) allows Denial of Service via Resource Depletion.  The SSH transport layer advertises legacy zlib compression by default and inflates attacker-controlled payloads pre-authentication without any size limit, enabling reliable memory exhaustion DoS.  Two compression algorithms are affected:  * zlib: Activates immediately after key exchange, enabling unauthenticated attacks * zlib@openssh.com: Activates post-authentication, enabling authenticated attacks  Each SSH packet can decompress ~255 MB from 256 KB of wire data (1029:1 amplification ratio). Multiple packets can rapidly exhaust available memory, causing OOM kills in memory-constrained environments.  This vulnerability is associated with program files lib/ssh/src/ssh_transport.erl and program routines ssh_transport:decompress/2, ssh_transport:handle_packet_part/4.  This issue affects OTP from OTP 17.0 until OTP 28.4.1, 27.3.4.9 and 26.2.5.18 corresponding to ssh from 3.0.1 until 5.5.1, 5.2.11.6 and 5.1.4.14.",
    "aliases": [
        {
            "alias": "CVE-2026-23943"
        }
    ],
    "fixed_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/93543?format=api",
            "purl": "pkg:deb/debian/erlang@1:23.2.6%2Bdfsg-1%2Bdeb11u1?distro=trixie",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-2uh8-nhph-gfb6"
                },
                {
                    "vulnerability": "VCID-883b-48uw-6yag"
                },
                {
                    "vulnerability": "VCID-b3hg-mjga-nbg1"
                },
                {
                    "vulnerability": "VCID-dazh-ypb5-akfp"
                },
                {
                    "vulnerability": "VCID-dccw-cx8r-r7a1"
                },
                {
                    "vulnerability": "VCID-ryy7-f45d-yyhv"
                },
                {
                    "vulnerability": "VCID-wsby-unw4-zqe7"
                },
                {
                    "vulnerability": "VCID-yyfx-f783-fqgk"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/erlang@1:23.2.6%252Bdfsg-1%252Bdeb11u1%3Fdistro=trixie"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/93570?format=api",
            "purl": "pkg:deb/debian/erlang@1:23.2.6%2Bdfsg-1%2Bdeb11u4?distro=trixie",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/erlang@1:23.2.6%252Bdfsg-1%252Bdeb11u4%3Fdistro=trixie"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/93541?format=api",
            "purl": "pkg:deb/debian/erlang@1:25.2.3%2Bdfsg-1%2Bdeb12u4?distro=trixie",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-2uh8-nhph-gfb6"
                },
                {
                    "vulnerability": "VCID-883b-48uw-6yag"
                },
                {
                    "vulnerability": "VCID-b3hg-mjga-nbg1"
                },
                {
                    "vulnerability": "VCID-dazh-ypb5-akfp"
                },
                {
                    "vulnerability": "VCID-ryy7-f45d-yyhv"
                },
                {
                    "vulnerability": "VCID-wsby-unw4-zqe7"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/erlang@1:25.2.3%252Bdfsg-1%252Bdeb12u4%3Fdistro=trixie"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/93545?format=api",
            "purl": "pkg:deb/debian/erlang@1:27.3.4.1%2Bdfsg-1%2Bdeb13u2?distro=trixie",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-2uh8-nhph-gfb6"
                },
                {
                    "vulnerability": "VCID-883b-48uw-6yag"
                },
                {
                    "vulnerability": "VCID-aqqx-g7d3-1yfy"
                },
                {
                    "vulnerability": "VCID-dazh-ypb5-akfp"
                },
                {
                    "vulnerability": "VCID-n6dc-39d1-83cr"
                },
                {
                    "vulnerability": "VCID-ryy7-f45d-yyhv"
                },
                {
                    "vulnerability": "VCID-wsby-unw4-zqe7"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/erlang@1:27.3.4.1%252Bdfsg-1%252Bdeb13u2%3Fdistro=trixie"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/93572?format=api",
            "purl": "pkg:deb/debian/erlang@1:27.3.4.9%2Bdfsg-1?distro=trixie",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/erlang@1:27.3.4.9%252Bdfsg-1%3Fdistro=trixie"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/93544?format=api",
            "purl": "pkg:deb/debian/erlang@1:27.3.4.12%2Bdfsg-1?distro=trixie",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/erlang@1:27.3.4.12%252Bdfsg-1%3Fdistro=trixie"
        }
    ],
    "affected_packages": [],
    "references": [
        {
            "reference_url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1130912",
            "reference_id": "1130912",
            "reference_type": "",
            "scores": [],
            "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1130912"
        }
    ],
    "weaknesses": [],
    "exploits": [],
    "severity_range_score": null,
    "exploitability": null,
    "weighted_severity": null,
    "risk_score": null,
    "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-2wmc-yahz-pbcj"
}