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fetchmail security update

Type: advisorySource: OSV1 source record

Fetchmail is a mail retrieval daemon that can download messages from POP3, IMAP, ODMR and ETRN-based stores, with SSL/TLS security including certificate verification, and pass downloaded mail to a local SMTP or LMTP server, or a message delivery agent such as maildrop. Security Fix(es): A stack-based buffer overflow flaw was found in fetchmail when built with NTLM support. A malicious or compromised mail server advertising NTLM authentication can send a crafted Type 2 challenge that causes fetchmail to write past a fixed stack buffer while building the NTLM authenticate response. This may lead to remote code execution depending on stack-frame layout, or to authentication failure or process termination under memory hardening. Affects v5.0.8 through v6.6.6.(CVE-2026-94184)

Announced Source revision 1
Original source ↗

OESA-2026-4206

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:OESA-2026-4206

fetchmail

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
6.4.37-3.oe2403sp4

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "6.4.37-3.oe2403sp4"
          }
        ]
      }
    ],
    "package": {
      "name": "fetchmail",
      "purl": "pkg:rpm/openEuler/fetchmail&distro=openEuler-24.03-LTS-SP4",
      "ecosystem": "openEuler:24.03-LTS-SP4"
    },
    "database_specific": {
      "source": "https://repo.openeuler.org/security/data/osv/OESA-2026-4206.json"
    },
    "ecosystem_specific": {
      "src": [
        "fetchmail-6.4.37-3.oe2403sp4.src.rpm"
      ],
      "x86_64": [
        "fetchmail-6.4.37-3.oe2403sp4.x86_64.rpm",
        "fetchmail-debuginfo-6.4.37-3.oe2403sp4.x86_64.rpm",
        "fetchmail-debugsource-6.4.37-3.oe2403sp4.x86_64.rpm"
      ],
      "aarch64": [
        "fetchmail-6.4.37-3.oe2403sp4.aarch64.rpm",
        "fetchmail-debuginfo-6.4.37-3.oe2403sp4.aarch64.rpm",
        "fetchmail-debugsource-6.4.37-3.oe2403sp4.aarch64.rpm"
      ]
    }
  }
]

Publisher severity

high

Source reference: /database_specific/severity

Event
#52118 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement