VYPR
Unrated severityNVD Advisory· Published Jul 17, 2018· Updated Aug 5, 2024

CVE-2018-14356

CVE-2018-14356

Description

An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16. pop.c mishandles a zero-length UID.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Mutt and NeoMutt before fixed versions mishandle zero-length UIDs in POP3, potentially allowing denial of service or information disclosure.

Vulnerability

In Mutt before 1.10.1 and NeoMutt before 2018-07-16, the POP3 implementation in pop.c does not properly handle a zero-length UID (Unique IDentifier) received from the server during the fetch_uidl call. A malicious or compromised POP3 server can send a response line with an empty UID value, which the client processes without validation, leading to undefined behavior [1][2][4]. The fix explicitly checks for a zero-length UID and returns an error [4].

Exploitation

An attacker can exploit this vulnerability by controlling a POP3 server that the victim's Mutt or NeoMutt client connects to. The attacker sends a specially crafted UIDL response containing a zero-length UID. No additional authentication or user interaction beyond connecting to the malicious server is required [2][4].

Impact

Successfully exploiting this vulnerability can cause a denial of service (crash) or potentially lead to information disclosure. The improperly handled zero-length UID may trigger memory corruption or reveal unintended data. The exact impact depends on the surrounding code, but the official description notes an "issue" due to mishandling, and the commit message indicates a missing check that could lead to undefined behavior [2][4].

Mitigation

Users should upgrade to Mutt 1.10.1 or later, or NeoMutt 2018-07-16 or later. These versions include the fix that validates UID length in fetch_uidl. The Gentoo security advisory GLSA 201810-07 recommends the upgrade and notes that no workaround is available [2]. The fix is public in the Mutt repository [4].

AI Insight generated on May 26, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.

Affected products

13

Patches

4
6a147a62cf39

merge: NeoMutt 2018-07-16

https://github.com/neomutt/neomuttRichard RussonJul 16, 2018via osv
41 files changed · +20281 20118
  • auto.def+1 1 modified
    @@ -14,7 +14,7 @@ use system cc cc-lib mutt-gettext mutt-iconv
     ###############################################################################
     # Names and versions
     define PACKAGE          "neomutt"
    -define PACKAGE_VERSION  "20180622"
    +define PACKAGE_VERSION  "20180716"
     define BUGS_ADDRESS     "neomutt-devel@neomutt.org"
     
     # Subdirectories that contain additional Makefile.autosetup files
    
  • ChangeLog.md+6 0 modified
    @@ -1,3 +1,9 @@
    +2018-07-16  Richard Russon  <rich@flatcap.org>
    +* Features
    +  - <check-stats> function
    +* Bug Fixes
    +  - Lots
    +
     2018-06-22  Richard Russon  <rich@flatcap.org>
     * Features
       - Expand variables inside backticks
    
  • doxygen/doxygen.conf+1 1 modified
    @@ -25,7 +25,7 @@ PROJECT_NAME           = "NeoMutt"
     # could be handy for archiving the generated documentation or if some version
     # control system is used.
     
    -PROJECT_NUMBER         = 2018-06-22
    +PROJECT_NUMBER         = 2018-07-16
     
     # Using the PROJECT_BRIEF tag one can provide an optional one line description
     # for a project that appears at the top of each page and should give viewer a
    
  • imap/auth_plain.c+2 1 modified
    @@ -77,7 +77,8 @@ enum ImapAuthRes imap_auth_plain(struct ImapData *idata, const char *method)
         }
         if (rc == IMAP_CMD_RESPOND)
         {
    -      mutt_str_strcat(buf + sizeof(auth_plain_cmd), sizeof(buf) - sizeof(auth_plain_cmd), "\r\n");
    +      mutt_str_strcat(buf + sizeof(auth_plain_cmd),
    +                      sizeof(buf) - sizeof(auth_plain_cmd), "\r\n");
           mutt_socket_send(idata->conn, buf + sizeof(auth_plain_cmd));
         }
       }
    
  • imap/imap.c+2 2 modified
    @@ -1730,8 +1730,8 @@ int imap_subscribe(char *path, bool subscribe)
         mutt_buffer_init(&err);
         err.data = errstr;
         err.dsize = sizeof(errstr);
    -	len = snprintf(mbox, sizeof(mbox), "%smailboxes ", subscribe ? "" : "un");
    -	imap_quote_string(mbox + len, sizeof(mbox) - len, path, true);
    +    len = snprintf(mbox, sizeof(mbox), "%smailboxes ", subscribe ? "" : "un");
    +    imap_quote_string(mbox + len, sizeof(mbox) - len, path, true);
         if (mutt_parse_rc_line(mbox, &token, &err))
           mutt_debug(1, "Error adding subscribed mailbox: %s\n", errstr);
         FREE(&token.data);
    
  • .mailmap+4 1 modified
    @@ -61,6 +61,7 @@ Jakub Jindra <jakub.jindra@socialbakers.com>                    Jakub Jindra <j
     Jakub Wilk <jwilk@jwilk.net>                                    Jakub Wilk <jwilk@jwilk.net>                             # @jwilk
     Jelle van der Waa <jelle@vdwaa.nl>                              Jelle van der Waa <jelle@vdwaa.nl>                       # @jelly
     Jenya Sovetkin <e.sovetkin@gmail.com>                           Jenya Sovetkin <e.sovetkin@gmail.com>                    # @esovetkin
    +JerikoOne <jeriko.one@gmx.us>                                   JerikoOne <jeriko.one@gmx.us>                            # @jeriko-one
     Joey Pabalinas <joeypabalinas@gmail.com>                        Joey Pabalinas <joeypabalinas@gmail.com>                 # @alyptik
     Johannes Weißl <jargon@molb.org>                               Johannes Weißl <jargon@molb.org>                        # @weisslj
     Jonathan Perkin <jperkin@netbsd.org>                            Jonathan Perkin <jperkin@netbsd.org>                     # @jperkin
    @@ -80,6 +81,7 @@ Marcin Rajner <mrajner@gik.pw.edu.pl>                           Marcin Rajner <m
     Marcin Rajner <mrajner@gik.pw.edu.pl>                           Marcin Rajner <mrajner@lenovo>                           # @mrajner
     Marcin Rajner <mrajner@gik.pw.edu.pl>                           Marcin Rajner lenovo <mrajner@gik.pw.edu.pl>             # @mrajner
     Marco Hinz <mh.codebro@gmail.com>                               Marco Hinz <mh.codebro@gmail.com>                        # @mhinz
    +Marco Sirabella <marco@sirabella.org>                           Marco Sirabella <marco@sirabella.org>                    # @mjsir911
     Marius Gedminas <marius@gedmin.as>                              Marius Gedminas <marius@gedmin.as>                       # @mgedmin
     Mehdi Abaakouk <sileht@sileht.net>                              Mehdi ABAAKOUK <sileht@sileht.net>                       # @sileht
     Mehdi Abaakouk <sileht@sileht.net>                              Mehdi Abaakouk <sileht@sileht.net>                       # @sileht
    @@ -156,7 +158,8 @@ Andreas Jobs <unknown>                                          Andreas Jobs <un
     Andrew Gaul <andrew@gaul.org>                                   Andrew Gaul <andrew@gaul.org>
     Andrew Nosenko <awn@bcs.zp.ua>                                  Andrew W. Nosenko <awn@bcs.zp.ua>
     Antoine Reilles <tonio@netbsd.org>                              Antoine Reilles <tonio@netbsd.org>
    -Anton Lindqvist <anton.lindqvist@gmail.com>                     Anton Lindqvist <anton.lindqvist@gmail.com>
    +Anton Lindqvist <anton@basename.se>                             Anton Lindqvist <anton.lindqvist@gmail.com>
    +Anton Lindqvist <anton@basename.se>                             Anton Lindqvist <anton@basename.se>
     Armin Wolfermann <aw@osn.de>                                    Armin Wolfermann <aw@osn.de>
     Aron Griffis <agriffis@n01se.net>                               Aron Griffis <agriffis@n01se.net>
     Athanasios Douitsis <aduitsis@gmail.com>                        Athanasios Douitsis <aduitsis@gmail.com>
    
  • newsrc.c+2 1 modified
    @@ -601,7 +601,8 @@ int nntp_add_group(char *line, void *data)
         return 0;
     
       /* These sscanf limits must match the sizes of the group and desc arrays */
    -  if (sscanf(line, "%1023s " ANUM " " ANUM " %c %8191[^\n]", group, &last, &first, &mod, desc) < 4)
    +  if (sscanf(line, "%1023s " ANUM " " ANUM " %c %8191[^\n]", group, &last,
    +             &first, &mod, desc) < 4)
       {
         mutt_debug(4, "Cannot parse server line: %s\n", line);
         return 0;
    
  • nntp.c+1 1 modified
    @@ -1289,7 +1289,7 @@ static int nntp_fetch_headers(struct Context *ctx, void *hc, anum_t first,
       fc.restore = restore;
       fc.messages = mutt_mem_calloc(last - first + 1, sizeof(unsigned char));
       if (fc.messages == NULL)
    -	  return -1;
    +    return -1;
     #ifdef USE_HCACHE
       fc.hc = hc;
     #endif
    
  • pattern.c+8 8 modified
    @@ -1885,13 +1885,13 @@ int mutt_pattern_exec(struct Pattern *pat, enum PatternExecFlag flags,
         case MUTT_SENDER:
           if (!h->env)
             return 0;
    -      return (pat->not ^ match_addrlist(pat, (flags & MUTT_MATCH_FULL_ADDRESS), 1,
    -                                        h->env->sender));
    +      return (pat->not ^ match_addrlist(pat, (flags & MUTT_MATCH_FULL_ADDRESS),
    +                                        1, h->env->sender));
         case MUTT_FROM:
           if (!h->env)
             return 0;
    -      return (pat->not ^
    -              match_addrlist(pat, (flags & MUTT_MATCH_FULL_ADDRESS), 1, h->env->from));
    +      return (pat->not ^ match_addrlist(pat, (flags & MUTT_MATCH_FULL_ADDRESS),
    +                                        1, h->env->from));
         case MUTT_TO:
           if (!h->env)
             return 0;
    @@ -1924,14 +1924,14 @@ int mutt_pattern_exec(struct Pattern *pat, enum PatternExecFlag flags,
         case MUTT_ADDRESS:
           if (!h->env)
             return 0;
    -      return (pat->not ^ match_addrlist(pat, (flags & MUTT_MATCH_FULL_ADDRESS), 4,
    -                                        h->env->from, h->env->sender,
    +      return (pat->not ^ match_addrlist(pat, (flags & MUTT_MATCH_FULL_ADDRESS),
    +                                        4, h->env->from, h->env->sender,
                                             h->env->to, h->env->cc));
         case MUTT_RECIPIENT:
           if (!h->env)
             return 0;
    -      return (pat->not ^ match_addrlist(pat, (flags & MUTT_MATCH_FULL_ADDRESS), 2,
    -                                        h->env->to, h->env->cc));
    +      return (pat->not ^ match_addrlist(pat, (flags & MUTT_MATCH_FULL_ADDRESS),
    +                                        2, h->env->to, h->env->cc));
         case MUTT_LIST: /* known list, subscribed or not */
           if (!h->env)
             return 0;
    
  • po/bg.po+675 670 modified
  • po/ca.po+675 670 modified
  • po/cs.po+675 670 modified
  • po/da.po+675 670 modified
  • po/de.po+675 670 modified
  • po/el.po+675 670 modified
  • po/en_GB.po+674 670 modified
  • po/eo.po+675 670 modified
  • po/es.po+675 670 modified
  • po/et.po+675 670 modified
  • po/eu.po+675 670 modified
  • po/fr.po+675 670 modified
  • po/ga.po+675 670 modified
  • po/gl.po+675 670 modified
  • po/hu.po+675 670 modified
  • po/id.po+675 670 modified
  • po/it.po+675 670 modified
  • po/ja.po+675 670 modified
  • po/ko.po+675 670 modified
  • po/lt.po+675 670 modified
  • po/nl.po+675 670 modified
  • po/pl.po+675 670 modified
  • po/pt_BR.po+675 670 modified
  • po/ru.po+675 670 modified
  • po/sk.po+675 670 modified
  • po/sv.po+675 670 modified
  • po/tr.po+675 670 modified
  • po/uk.po+675 670 modified
  • po/zh_CN.po+675 670 modified
  • po/zh_TW.po+675 670 modified
  • README.md+3 1 modified
    @@ -2,7 +2,7 @@
     
     [![Stars](https://img.shields.io/github/stars/neomutt/neomutt.svg?style=social&label=Stars)](https://github.com/neomutt/neomutt "Give us a Star")
     [![Twitter](https://img.shields.io/twitter/follow/NeoMutt_Org.svg?style=social&label=Follow)](https://twitter.com/NeoMutt_Org "Follow us on Twitter")
    -[![Contributors](https://img.shields.io/badge/Contributors-127-orange.svg)](#contributors "All of NeoMutt's Contributors")
    +[![Contributors](https://img.shields.io/badge/Contributors-132-orange.svg)](#contributors "All of NeoMutt's Contributors")
     [![Release](https://img.shields.io/github/release/neomutt/neomutt.svg)](https://github.com/neomutt/neomutt/releases/latest "Latest Release Notes")
     [![License: GPL v2](https://img.shields.io/badge/License-GPL%20v2-blue.svg)](https://github.com/neomutt/neomutt/blob/master/COPYRIGHT.md "Copyright Statement")
     [![Code build](https://img.shields.io/travis/neomutt/neomutt.svg?label=code)](https://travis-ci.org/neomutt/neomutt "Latest Automatic Code Build")
    @@ -137,6 +137,7 @@ Here's a list of everyone who's helped NeoMutt:
     [Jasper Adriaanse](https://github.com/jasperla "jasperla"),
     [Jelle van der Waa](https://github.com/jelly "jelly"),
     [Jenya Sovetkin](https://github.com/esovetkin "esovetkin"),
    +[JerikoOne](https://github.com/jeriko-one "jeriko-one"),
     [Joey Pabalinas](https://github.com/alyptik "alyptik"),
     [Johannes Frankenau](https://github.com/tsuflux "tsuflux"),
     [Johannes Weißl](https://github.com/weisslj "weisslj"),
    @@ -156,6 +157,7 @@ Here's a list of everyone who's helped NeoMutt:
     [Manos Pitsidianakis](https://github.com/epilys "epilys"),
     [Marcin Rajner](https://github.com/mrajner "mrajner"),
     [Marco Hinz](https://github.com/mhinz "mhinz"),
    +[Marco Sirabella](https://github.com/mjsir911 "mjsir911"),
     [Marius Gedminas](https://github.com/mgedmin "mgedmin"),
     [Mateusz Piotrowski](https://github.com/0mp "0mp"),
     [Matteo Vescovi](https://github.com/mfvescovi "mfvescovi"),
    
  • send.c+2 1 modified
    @@ -1076,7 +1076,8 @@ struct Address *mutt_default_from(void)
     
       if (From)
         addr = mutt_addr_copy(From);
    -  else {
    +  else
    +  {
         addr = mutt_addr_new();
         if (UseDomain)
         {
    
93b8ac558752

Ensure UID in fetch_uidl

https://github.com/neomutt/neomuttJerikoOneJul 7, 2018via osv
1 file changed · +4 0
  • pop.c+4 0 modified
    @@ -202,6 +202,10 @@ static int fetch_uidl(char *line, void *data)
         endp++;
       memmove(line, endp, strlen(endp) + 1);
     
    +  /* uid must be at least be 1 byte */
    +  if (strlen(line) == 0)
    +    return -1;
    +
       for (i = 0; i < ctx->msgcount; i++)
         if (mutt_str_strcmp(line, ctx->hdrs[i]->data) == 0)
           break;
    

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

8

News mentions

0

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