CVE-2019-10735
In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them...
In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
4.3
In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.
- Record
CVE-2019-10735- CVSS 3.0
- 4.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-319
- Updated
- 2026-11-02
CVE List No score
In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.
- Record
CVE-2019-10735- Updated
- 2026-11-02
EUVDEUVD-2019-2529 No score
In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.
- Record
EUVD-2019-2529- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-c859-hx66-mxc5
4.3
In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them...
In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.
- Record
GHSA-c859-hx66-mxc5- CVSS 3.0
- 4.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Weakness
- CWE-319
- Updated
- 2026-11-02
OSV
4.3
In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.
- Record
CVE-2019-10735- CVSS 3.0
- 4.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSVDEBIAN-CVE-2019-10735
4.3
In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.
- Record
DEBIAN-CVE-2019-10735- CVSS 3.0
- 4.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2019-10735
4.3
In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.
- Record
UBUNTU-CVE-2019-10735- CVSS 3.0
- 4.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
claws-mailDebian:12 |
All versions, plus listed versions 4.1.1-24.1.1-34.1.1-44.1.1-4~bpo11+14.1.1-4~bpo12+1 Show 12 moreShow less4.2.0-14.2.0-1~bpo11+14.2.0-1~bpo12+14.2.0-24.3.0-14.3.0-1~bpo11+14.3.0-1~bpo12+14.3.0-24.3.1-14.3.1-1~bpo12+14.4.0-14.4.0-1~bpo13+1 |
None known |
claws-mailDebian:13 |
All versions, plus listed versions 4.3.1-14.4.0-14.4.0-1~bpo13+1 |
None known |
claws-mailDebian:14 |
All versions, plus listed versions 4.3.1-14.4.0-14.4.0-1~bpo13+1 |
None known |
claws-mailUbuntu:16.04:LTS |
All versions, plus listed versions 3.12.0-1ubuntu13.12.0-1ubuntu23.13.1-1.1ubuntu13.13.1-1.1ubuntu23.13.1-1.1ubuntu33.13.2-1ubuntu1 |
None known |
claws-mailUbuntu:18.04:LTS |
All versions, plus listed versions 3.15.0-2build23.15.1-13.15.1-1ubuntu13.16.0-1 |
None known |
claws-mailUbuntu:20.04:LTS |
All versions, plus listed versions 3.17.4-13.17.4-1build13.17.4-2build23.17.4-2ubuntu13.17.5-2 |
None known |
claws-mailUbuntu:22.04:LTS |
All versions, plus listed versions 3.17.8-1build23.18.0-14.0.0-24.0.0-2build14.0.0-3 |
None known |
claws-mailUbuntu:24.04:LTS |
All versions, plus listed versions 4.1.1-44.1.1-4build14.2.0-14.2.0-1ubuntu14.2.0-24.2.0-2build64.2.0-2build7 |
None known |
claws-mailUbuntu:25.10 |
All versions, plus listed versions 4.3.1-1 |
None known |
claws-mailUbuntu:26.10 |
All versions, plus listed versions 4.3.1-1ubuntu14.4.0-14.4.0-1build1 |
None known |
claws-mailUbuntu:26.04:LTS |
All versions, plus listed versions 4.3.1-14.3.1-1build14.3.1-1build24.3.1-1ubuntu1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-10735 is a medium vulnerability (CVSS 4.3) in Claws-mail Mail, published April 7, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.61%, the 49th percentile. No source names a fixed version.