Every CVE Search/ Get API key

CVE-2019-10735

In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them...

4.3 Medium

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

0.61%Up 0.2 points since Apr 14, 2021
90%50%10%1%

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 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CVSS 2.0
4.3 MediumAV: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 MediumCVSS: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 MediumCVSS: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 MediumCVSS: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 MediumCVSS: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

Affected packages
PackageAffectedFixed
claws-mail
Debian: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 less
4.2.0-14.2.0-1~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-mail
Debian:13
All versions, plus listed versions
4.3.1-14.4.0-14.4.0-1~bpo13+1
None known
claws-mail
Debian:14
All versions, plus listed versions
4.3.1-14.4.0-14.4.0-1~bpo13+1
None known
claws-mail
Ubuntu: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-mail
Ubuntu:18.04:LTS
All versions, plus listed versions
3.15.0-2build23.15.1-13.15.1-1ubuntu13.16.0-1
None known
claws-mail
Ubuntu: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-mail
Ubuntu: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-mail
Ubuntu: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-mail
Ubuntu:25.10
All versions, plus listed versions
4.3.1-1
None known
claws-mail
Ubuntu:26.10
All versions, plus listed versions
4.3.1-1ubuntu14.4.0-14.4.0-1build1
None known
claws-mail
Ubuntu:26.04:LTS
All versions, plus listed versions
4.3.1-14.3.1-1build14.3.1-1build24.3.1-1ubuntu1
None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE 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.

References

MoveEnter Open