PT-2026-29975 · Unknown+1 · Roundcube Webmail+1

Y0Us · CVE-2026-35537 · Published 2026-03-18 · Updated 2026-05-07

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:C/A:N

Name of the Vulnerable Software and Affected Versions Roundcube Webmail versions prior to 1.5.14 and prior to 1.6.14

Description An issue exists in Roundcube Webmail related to unsafe deserialization within the redis/memcache session handler. This could allow unauthenticated attackers to perform arbitrary file write operations by submitting crafted session data.

Recommendations Update Roundcube Webmail to version 1.5.14 or later. Update Roundcube Webmail to version 1.6.14 or later.

Exploit

Fix

DoS

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

BDU:2026-06181

CVE-2026-35537

GHSA-RXJ3-RRWM-PJ4R

OPENSUSE-SU-2026:20586-1

Affected Products

Red Os

Roundcube Webmail

References · 28

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35537.json · Exploit
• https://github.com/roundcube/roundcubemail/commit/618c5428edc69fb088e7ac6c89e506dd39df3 · Patch
• https://github.com/roundcube/roundcubemail/commit/a4ead994d2f0ea92e4a1603196a197e0d5df1620 · Patch
• https://github.com/roundcube/roundcubemail/commit/6d586cfa4d8a31f7957f7a445aaedd52592a0e74 · Patch
• https://bdu.fstec.ru/vul/2026-06181 · Security Note
• https://osv.dev/vulnerability/GHSA-rxj3-rrwm-pj4r · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:20586-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-35537 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-35537 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-35537 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-35537 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-35537 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-35537 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-35537 · Vendor Advisory
• https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5 · Note