libxml2 — security advisory

{
  "id": "820f9cf1626678a76a99443fece8a5b4c5980a4f9ab7b470f555a3d9c9598d84",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-11979",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-11979",
    "summary": "libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in --shell mode. The usershell() function processes user input using fixed-size stack buffers without proper bounds checking. By supplying an overly long input line, an attacker can overflow internal buffers (command, arg, and argv) during input parsing. This results in memory corruption within the stack frame. Successful exploitation may cause a crash or potentially allow arbitrary code execution in the context of the xmlcatalog process. This issue has been fixed in the commit c2e233fc. NOTE: The maintainers of this project did not agree that this issue is a vulnerability and considered it a bug.",
    "evidence": "osv:UBUNTU-CVE-2026-11979",
    "products": [
      {
        "name": {
          "value": "libxml2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.9.1+dfsg1-3ubuntu2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.5",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.6",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.7",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.8",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.9",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.10",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.11",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.12",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.13",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.9.1+dfsg1-3ubuntu4.13+esm1",
            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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            "value": "2.9.1+dfsg1-3ubuntu4.13+esm7",
            "evidence": "/affected/0/versions"
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          {
            "value": "2.9.1+dfsg1-3ubuntu4.13+esm8",
            "evidence": "/affected/0/versions"
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          {
            "value": "2.9.1+dfsg1-3ubuntu4.13+esm9",
            "evidence": "/affected/0/versions"
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          {
            "value": "2.9.1+dfsg1-3ubuntu4.13+esm10",
            "evidence": "/affected/0/versions"
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          {
            "value": "2.9.1+dfsg1-3ubuntu4.13+esm11",
            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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        ]
      },
      {
        "name": {
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          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
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            "value": "2.9.2+zdfsg1-4",
            "evidence": "/affected/1/versions"
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          {
            "value": "2.9.2+zdfsg1-4ubuntu1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.9.2+zdfsg1-4ubuntu2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.9.2+zdfsg1-4ubuntu3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.9.3+dfsg1-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.9.3+dfsg1-1ubuntu0.1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.9.3+dfsg1-1ubuntu0.2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.9.3+dfsg1-1ubuntu0.3",
            "evidence": "/affected/1/versions"
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          {
            "value": "2.9.3+dfsg1-1ubuntu0.4",
            "evidence": "/affected/1/versions"
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          {
            "value": "2.9.3+dfsg1-1ubuntu0.5",
            "evidence": "/affected/1/versions"
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            "value": "2.9.3+dfsg1-1ubuntu0.6",
            "evidence": "/affected/1/versions"
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            "value": "2.9.3+dfsg1-1ubuntu0.7",
            "evidence": "/affected/1/versions"
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            "evidence": "/affected/1/versions"
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            "evidence": "/affected/1/versions"
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            "evidence": "/affected/1/versions"
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            "evidence": "/affected/1/versions"
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            "value": "2.9.3+dfsg1-1ubuntu0.7+esm6",
            "evidence": "/affected/1/versions"
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          {
            "value": "2.9.3+dfsg1-1ubuntu0.7+esm7",
            "evidence": "/affected/1/versions"
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            "value": "2.9.3+dfsg1-1ubuntu0.7+esm8",
            "evidence": "/affected/1/versions"
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            "value": "2.9.3+dfsg1-1ubuntu0.7+esm9",
            "evidence": "/affected/1/versions"
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            "evidence": "/affected/1/versions"
          },
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            "evidence": "/affected/1/versions"
          },
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            "value": "2.9.3+dfsg1-1ubuntu0.7+esm12",
            "evidence": "/affected/1/versions"
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            "value": "2.9.3+dfsg1-1ubuntu0.7+esm13",
            "evidence": "/affected/1/versions"
          },
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            "value": "2.9.3+dfsg1-1ubuntu0.7+esm14",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
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          "evidence": "/affected/2/package/name"
        },
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        "affected_versions": [
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            "value": "2.9.4+dfsg1-4ubuntu1",
            "evidence": "/affected/2/versions"
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            "value": "2.9.4+dfsg1-5ubuntu1",
            "evidence": "/affected/2/versions"
          },
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            "value": "2.9.4+dfsg1-5ubuntu2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.9.4+dfsg1-5.1ubuntu1",
            "evidence": "/affected/2/versions"
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            "value": "2.9.4+dfsg1-5.2ubuntu1",
            "evidence": "/affected/2/versions"
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            "value": "2.9.4+dfsg1-6.1ubuntu1",
            "evidence": "/affected/2/versions"
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            "evidence": "/affected/2/versions"
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            "value": "2.9.4+dfsg1-6.1ubuntu1.3",
            "evidence": "/affected/2/versions"
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            "evidence": "/affected/2/versions"
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            "evidence": "/affected/2/versions"
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            "evidence": "/affected/2/versions"
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/4/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/5/versions"
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            "evidence": "/affected/6/versions"
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            "evidence": "/affected/6/versions"
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            "evidence": "/affected/6/versions"
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            "evidence": "/affected/6/versions"
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            "evidence": "/affected/6/versions"
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            "evidence": "/affected/6/versions"
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            "evidence": "/affected/6/versions"
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          {
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            "evidence": "/affected/6/versions"
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            "evidence": "/affected/6/versions"
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            "evidence": "/affected/6/versions"
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            "evidence": "/affected/6/versions"
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            "evidence": "/affected/7/versions"
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            "evidence": "/affected/7/versions"
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            "evidence": "/affected/7/versions"
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            "evidence": "/affected/7/versions"
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  "published_at": "2026-06-29T14:16:00+00:00"
}