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🛡️ OESA-2026-2200 — mutt (CVE-2026-43859 +5 more)

🟢 CVSS 2.0 — Low ✅ No Known Exploit OSV
2.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

mutt security update

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)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: None.

Affected software

OESA-2026-2200 is recorded against 1 package.

  • mutt (fixed in 2.2.12-4.oe2003sp4)

Timeline and source

Published on 9 May 2026 and last revised on 18 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.openeuler.org (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)

Other advisories for this package

mutt has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity LOW
CVSS Score 2.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-05-09
Updated 2026-08-20
Modified 2026-08-18
Fix URL N/A

Affected Packages

Software From version Fixed in
mutt — 2.2.12-4.oe2003sp4

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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