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No exploitation reported

CVE-2019-10735

No exploitation reported by the sources we read.

  • Published2019-04-07
  • WeaknessCWE-319

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2019-04-0715:29CVE publishedNVD

Versions per branch

NVD
Claws-mail mail
BranchAffectedFixed in
3.14= 3.14.1no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • claws-mailUbuntu:26.10all versions · no fixed version listed
  • claws-mailUbuntu:26.04:LTSall versions · no fixed version listed
  • claws-mailUbuntu:25.10all versions · no fixed version listed
  • claws-mailUbuntu:24.04:LTSall versions · no fixed version listed
  • claws-mailUbuntu:22.04:LTSall versions · no fixed version listed
  • claws-mailUbuntu:20.04:LTSall versions · no fixed version listed
  • claws-mailUbuntu:18.04:LTSall versions · no fixed version listed
  • claws-mailUbuntu:16.04:LTSall versions · no fixed version listed

3 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-10735 Red Hat Product Security

    claws-mail: information disclosure of encrypted mail

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Published
2019-04-07
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-c859-hx66-mxc5

Frequently asked questions

What is CVE-2019-10735?

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.

Is CVE-2019-10735 actively exploited?

Active exploitation of CVE-2019-10735 has not been confirmed. Its EPSS score was 0.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-10735?

CVE-2019-10735 has a CVSS v3 base score of 4.3 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

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