SMTP end-of-response out-of-bounds read

{
  "id": "6280f72b7f38bb7f89edb0d1c2aa6c366cfac21ecdaa14f430030e88fadcf7db",
  "url": "https://osv.dev/vulnerability/CURL-CVE-2019-3823",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SMTP end-of-response out-of-bounds read",
    "summary": "libcurl contains a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` is not null-terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. The read content is not returned to the caller.",
    "evidence": "osv:CURL-CVE-2019-3823",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CURL-CVE-2019-3823",
      "aliases": [
        "CURL-CVE-2019-3823",
        "CVE-2019-3823"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "7.34.0"
                },
                {
                  "fixed": "7.64.0"
                }
              ]
            },
            {
              "repo": "https://github.com/curl/curl.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2766262a68688c1dd8143f9c4be84b46c408b70a"
                },
                {
                  "fixed": "39df4073e5413fcdbb5a38da0c1ce6f1c0ceb484"
                }
              ]
            }
          ],
          "versions": [
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            "curl-7_63_0",
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            "curl-7_61_1",
            "curl-7_61_0",
            "curl-7_60_0",
            "curl-7_59_0",
            "curl-7_58_0",
            "curl-7_57_0",
            "curl-7_56_1",
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            "curl-7_52_0",
            "curl-7_51_0",
            "curl-7_50_3",
            "curl-7_50_2",
            "curl-7_50_1",
            "curl-7_50_0",
            "curl-7_49_1",
            "curl-7_49_0",
            "curl-7_48_0",
            "curl-7_47_1",
            "curl-7_47_0",
            "curl-7_46_0",
            "curl-7_45_0",
            "curl-7_44_0",
            "curl-7_43_0",
            "curl-7_42_1",
            "curl-7_42_0",
            "curl-7_41_0",
            "curl-7_40_0",
            "curl-7_39_0",
            "curl-7_38_0",
            "curl-7_37_1",
            "curl-7_37_0",
            "curl-7_36_0",
            "curl-7_35_0",
            "curl-7_34_0"
          ],
          "database_specific": {
            "source": "https://curl.se/docs/CURL-CVE-2019-3823.json",
            "vanir_signatures": [
              {
                "id": "CURL-CVE-2019-3823-5d016fd5",
                "digest": {
                  "length": 557,
                  "function_hash": "166416251957804652761319498324214462375"
                },
                "source": "https://github.com/curl/curl.git/commit/39df4073e5413fcdbb5a38da0c1ce6f1c0ceb484",
                "target": {
                  "file": "lib/smtp.c",
                  "function": "smtp_endofresp"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CURL-CVE-2019-3823-e149f9eb",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "42064024752947728907032929215875540612",
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                  ]
                },
                "source": "https://github.com/curl/curl.git/commit/39df4073e5413fcdbb5a38da0c1ce6f1c0ceb484",
                "target": {
                  "file": "lib/smtp.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-25T01:04:54Z"
          }
        }
      ],
      "modified": "2026-10-25T01:04:54.015594870Z",
      "provider": "osv",
      "references": [],
      "provider_metadata": {
        "CWE": {
          "id": "CWE-125",
          "desc": "Out-of-bounds Read"
        },
        "URL": "https://curl.se/docs/CVE-2019-3823.json",
        "www": "https://curl.se/docs/CVE-2019-3823.html",
        "affects": "both",
        "package": "curl",
        "severity": "Low",
        "last_affected": "7.63.0"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2019-3823",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 444305,
  "published_at": "2019-02-06T08:00:00+00:00"
}