Vulnerability-Lookup

OESA-2026-2200 (CVE-2026-43859)

Vulnerability from osv_openeuler – Published: 2026-05-09 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

mutt security update

Details

Mutt is a small but very powerful text-based mail client for Unix operating systems.

Security Fix(es):

mutt before version 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest, which may lead to buffer handling issues.(CVE-2026-43859)

Mutt email client before version 2.3.2 contains a vulnerability where the hash_passwd is sometimes truncated by one byte during IMAP auth_cram MD5 digest authentication, potentially causing authentication failures or security issues.(CVE-2026-43860)

mutt before 2.3.2 does not check for '\0' in url_pct_decode, resulting in improper null byte handling vulnerability.(CVE-2026-43861)

In mutt before version 2.3.2, the imap_auth_gss security level is mishandled, which may lead to security vulnerabilities.(CVE-2026-43862)

mutt before 2.3.2 has an infinite loop in data_object_to_stream in crypt-gpgme.c.(CVE-2026-43863)

mutt before version 2.3.2 has a NULL pointer dereference vulnerability in the show_sig_summary function.(CVE-2026-43864)

Severity

3.7 (Low)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-43859	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-43860	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-43861	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-43862	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-43863	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-43864	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "mutt-2.2.12-4.oe2203sp4.aarch64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2203sp4.aarch64.rpm",
          "mutt-debugsource-2.2.12-4.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
          "mutt-help-2.2.12-4.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "mutt-2.2.12-4.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "mutt-2.2.12-4.oe2203sp4.x86_64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2203sp4.x86_64.rpm",
          "mutt-debugsource-2.2.12-4.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "mutt",
        "purl": "pkg:rpm/openEuler/mutt\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.12-4.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "mutt-2.2.12-4.oe2403.aarch64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2403.aarch64.rpm",
          "mutt-debugsource-2.2.12-4.oe2403.aarch64.rpm",
          "mutt-2.2.12-4.oe2403sp1.aarch64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2403sp1.aarch64.rpm",
          "mutt-debugsource-2.2.12-4.oe2403sp1.aarch64.rpm",
          "mutt-2.2.12-4.oe2403sp3.aarch64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2403sp3.aarch64.rpm",
          "mutt-debugsource-2.2.12-4.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "mutt-help-2.2.12-4.oe2403.noarch.rpm",
          "mutt-help-2.2.12-4.oe2403sp1.noarch.rpm",
          "mutt-help-2.2.12-4.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "mutt-2.2.12-4.oe2403.src.rpm",
          "mutt-2.2.12-4.oe2403sp1.src.rpm",
          "mutt-2.2.12-4.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "mutt-2.2.12-4.oe2403.x86_64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2403.x86_64.rpm",
          "mutt-debugsource-2.2.12-4.oe2403.x86_64.rpm",
          "mutt-2.2.12-4.oe2403sp1.x86_64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2403sp1.x86_64.rpm",
          "mutt-debugsource-2.2.12-4.oe2403sp1.x86_64.rpm",
          "mutt-2.2.12-4.oe2403sp3.x86_64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2403sp3.x86_64.rpm",
          "mutt-debugsource-2.2.12-4.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS",
        "name": "mutt",
        "purl": "pkg:rpm/openEuler/mutt\u0026distro=openEuler-24.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.12-4.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "mutt-2.2.12-4.oe2403sp1.aarch64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2403sp1.aarch64.rpm",
          "mutt-debugsource-2.2.12-4.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "mutt-help-2.2.12-4.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "mutt-2.2.12-4.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "mutt-2.2.12-4.oe2403sp1.x86_64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2403sp1.x86_64.rpm",
          "mutt-debugsource-2.2.12-4.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "mutt",
        "purl": "pkg:rpm/openEuler/mutt\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.12-4.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "mutt-2.2.12-4.oe2403sp3.aarch64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2403sp3.aarch64.rpm",
          "mutt-debugsource-2.2.12-4.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "mutt-help-2.2.12-4.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "mutt-2.2.12-4.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "mutt-2.2.12-4.oe2403sp3.x86_64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2403sp3.x86_64.rpm",
          "mutt-debugsource-2.2.12-4.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "mutt",
        "purl": "pkg:rpm/openEuler/mutt\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.12-4.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "mutt-2.2.12-4.oe2003sp4.aarch64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2003sp4.aarch64.rpm",
          "mutt-debugsource-2.2.12-4.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "mutt-help-2.2.12-4.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "mutt-2.2.12-4.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "mutt-2.2.12-4.oe2003sp4.x86_64.rpm",
          "mutt-debuginfo-2.2.12-4.oe2003sp4.x86_64.rpm",
          "mutt-debugsource-2.2.12-4.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "mutt",
        "purl": "pkg:rpm/openEuler/mutt\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.12-4.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Low"
  },
  "details": "Mutt is a small but very powerful text-based mail client for Unix operating systems.\r\n\r\nSecurity Fix(es):\n\nmutt before version 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest, which may lead to buffer handling issues.(CVE-2026-43859)\n\nMutt email client before version 2.3.2 contains a vulnerability where the hash_passwd is sometimes truncated by one byte during IMAP auth_cram MD5 digest authentication, potentially causing authentication failures or security issues.(CVE-2026-43860)\n\nmutt before 2.3.2 does not check for \u0026apos;\\0\u0026apos; in url_pct_decode, resulting in improper null byte handling vulnerability.(CVE-2026-43861)\n\nIn mutt before version 2.3.2, the imap_auth_gss security level is mishandled, which may lead to security vulnerabilities.(CVE-2026-43862)\n\nmutt before 2.3.2 has an infinite loop in data_object_to_stream in crypt-gpgme.c.(CVE-2026-43863)\n\nmutt before version 2.3.2 has a NULL pointer dereference vulnerability in the show_sig_summary function.(CVE-2026-43864)",
  "id": "OESA-2026-2200",
  "modified": "2026-08-06T11:11:11Z",
  "published": "2026-05-09T11:11:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2200"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43859"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43860"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43861"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43862"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43863"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43864"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "mutt security update",
  "upstream": [
    "CVE-2026-43859",
    "CVE-2026-43860",
    "CVE-2026-43861",
    "CVE-2026-43862",
    "CVE-2026-43863",
    "CVE-2026-43864"
  ]
}

CVE-2026-43859 (GCVE-0-2026-43859)

Vulnerability from cvelistv5 – Published: 2026-05-04 05:41 – Updated: 2026-05-04 18:20

Summary

mutt before 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest.

Severity

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-04 12:49 UTC

CWE

CWE-158 - Improper Neutralization of Null Byte or NUL Character

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/muttmua/mutt/commit/834c5a2ed0…

Impacted products

1 product

Vendor	Product	Version
mutt	mutt	Affected: 0 , < 2.3.2 (semver) cpe:2.3:a:mutt:mutt::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-43860 (GCVE-0-2026-43860)

Vulnerability from cvelistv5 – Published: 2026-05-04 05:45 – Updated: 2026-05-04 18:20

Summary

mutt before 2.3.2 sometimes truncates the hash_passwd by one byte for IMAP auth_cram MD5 digest.

Severity

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-04 12:50 UTC

CWE

CWE-193 - Off-by-one Error

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/muttmua/mutt/commit/834c5a2ed0…

Impacted products

1 product

Vendor	Product	Version
mutt	mutt	Affected: 0 , < 2.3.2 (semver) cpe:2.3:a:mutt:mutt::::::::

Show details on NVD website

JSON

To clipboard

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  "containers": {
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                "id": "CVE-2026-43860",
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CVE-2026-43861 (GCVE-0-2026-43861)

Vulnerability from cvelistv5 – Published: 2026-05-04 05:52 – Updated: 2026-05-04 18:20

Summary

mutt before 2.3.2 does not check for '\0' in url_pct_decode.

Severity

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-04 12:45 UTC

CWE

CWE-158 - Improper Neutralization of Null Byte or NUL Character

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/muttmua/mutt/commit/12f54fe3b6…

Impacted products

1 product

Vendor	Product	Version
mutt	mutt	Affected: 0 , < 2.3.2 (semver) cpe:2.3:a:mutt:mutt::::::::

Show details on NVD website

JSON

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CVE-2026-43862 (GCVE-0-2026-43862)

Vulnerability from cvelistv5 – Published: 2026-05-04 06:00 – Updated: 2026-05-04 18:21

Summary

In mutt before 2.3.2, the imap_auth_gss security level is mishandled.

Severity

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-04 13:46 UTC

CWE

CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/muttmua/mutt/commit/f547a849cd…

Impacted products

1 product

Vendor	Product	Version
mutt	mutt	Affected: 0 , < 2.3.2 (semver) cpe:2.3:a:mutt:mutt::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-43863 (GCVE-0-2026-43863)

Vulnerability from cvelistv5 – Published: 2026-05-04 06:05 – Updated: 2026-05-04 18:25

Summary

mutt before 2.3.2 has an infinite loop in data_object_to_stream in crypt-gpgme.c.

Severity

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-04 13:47 UTC

CWE

CWE-253 - Incorrect Check of Function Return Value

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/muttmua/mutt/commit/fdc04a1717…

Impacted products

1 product

Vendor	Product	Version
mutt	mutt	Affected: 0 , < 2.3.2 (semver) cpe:2.3:a:mutt:mutt::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-43864 (GCVE-0-2026-43864)

Vulnerability from cvelistv5 – Published: 2026-05-04 06:10 – Updated: 2026-05-04 18:26

Summary

mutt before 2.3.2 has a show_sig_summary NULL pointer dereference.

Severity

2.5 (Low)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-04 13:47 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/muttmua/mutt/commit/ebfa296904…

Impacted products

1 product

Vendor	Product	Version
mutt	mutt	Affected: 0 , < 2.3.2 (semver) cpe:2.3:a:mutt:mutt::::::::

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2026-2200 (CVE-2026-43859)

CVE-2026-43859 (GCVE-0-2026-43859)

CVE-2026-43860 (GCVE-0-2026-43860)

CVE-2026-43861 (GCVE-0-2026-43861)

CVE-2026-43862 (GCVE-0-2026-43862)

CVE-2026-43863 (GCVE-0-2026-43863)

CVE-2026-43864 (GCVE-0-2026-43864)

Tags

Sightings

Nomenclature

Related by attack behaviour