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Medium

Security advisory

Type: advisorySources: OSVCVE: CVE-2020-27787

A Segmentaation fault was found in UPX in invert_pt_dynamic() function in p_lx_elf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.

Products
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Affected versions
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Fixed versions
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CVEs
CVE-2020-27787
Confirmed fixed CVEs
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Updated in this feed
31 Oct 2026, 12:36 UTC · Revision 1

Source evidence

CVE-2020-27787

core-osv · Original source

Published 18 Aug 2022, 19:15 UTC

A Segmentaation fault was found in UPX in invert_pt_dynamic() function in p_lx_elf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.

osv:CVE-2020-27787
Complete source record
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  "id": "88e74204aebb8afa8a83d085b14d2697c07bfcf8c7e8db1610ddad794ab587a9",
  "url": "https://osv.dev/vulnerability/CVE-2020-27787",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-27787",
    "summary": "A Segmentaation fault was found in UPX in invert_pt_dynamic() function in p_lx_elf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.",
    "evidence": "osv:CVE-2020-27787",
    "products": [],
    "severity": "medium",
    "structured": {
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      "aliases": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
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      ],
      "affected": [
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                  "introduced": "0"
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                  "fixed": "d7ba31cab8ce8d95d2c10e88d2ec787ac52005ef"
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                {
                  "fixed": "e2f60adc95334f47e286838dac33160819c5d74d"
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            "v1.11",
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          ],
          "database_specific": {
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                "source": "https://github.com/upx/upx/commit/e2f60adc95334f47e286838dac33160819c5d74d",
                "target": {
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                  "function": "PackLinuxElf32::invert_pt_dynamic"
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                "source": "https://github.com/upx/upx/commit/e2f60adc95334f47e286838dac33160819c5d74d",
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      ],
      "modified": "2026-10-20T13:59:24.625754556Z",
      "provider": "osv",
      "references": [
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  "source_id": "core-osv",
  "document_id": 388482,
  "published_at": "2022-08-18T19:15:14.21+00:00"
}