Description
LibVNC before 2f5b2ad1c6c99b1ac6482c95844a84d66bb52838 contains multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | LibVNC | commit 2f5b2ad1c6c99b1ac6482c95844a84d66bb52838 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libvncserver | 0.9.11+dfsg-1.2 | — |
| Debian 14 | ssvnc | 1.0.29-5 | — |
| Debian 14 | tightvnc | 1:1.3.9-9.1 | — |
| Debian 13 | libvncserver | 0.9.11+dfsg-1.2 | — |
| Debian 13 | ssvnc | 1.0.29-5 | — |
| Debian 13 | tightvnc | 1:1.3.9-9.1 | — |
| Debian 13 | veyon | 4.1.4+repack1-1 | — |
| Debian 12 | libvncserver | 0.9.11+dfsg-1.2 | — |
| Debian 12 | ssvnc | 1.0.29-5 | — |
| Debian 12 | tightvnc | 1:1.3.9-9.1 | — |
| Debian 12 | veyon | 4.1.4+repack1-1 | — |
| Debian 9 | libvncserver | 0.9.11+dfsg-1.3~deb9u1 | DSA-4383-1 |
| Debian 8 | italc | 1:2.0.2+dfsg1-2+deb8u1 | DLA-1979-1 |
| Debian 8 | libvncserver | 0.9.9+dfsg2-6.1+deb8u4 | DLA-1617-1 |
| Debian 8 | ssvnc | 1.0.29-2+deb8u1 | DLA-2016-1 |
| Debian 8 | tightvnc | 1.3.9-6.5+deb8u1 | DLA-2045-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tightvnc | No fix yet | — |
| Ubuntu 26.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 25.10 | tightvnc | No fix yet | — |
| Ubuntu 24.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 22.04 LTS | tightvnc | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 18.04 LTS | italc | 1:3.0.3+dfsg1-3ubuntu0.1 | USN-4547-1 |
| Ubuntu 18.04 LTS | libvncserver | 0.9.11+dfsg-1ubuntu1.1 | USN-3877-1 |
| Ubuntu 18.04 LTS | ssvnc +1 | No fix yet | — |
| Ubuntu 16.04 LTS | italc | 1:2.0.2+dfsg1-4ubuntu0.1 | USN-4587-1 |
| Ubuntu 16.04 LTS | libvncserver | 0.9.10+dfsg-3ubuntu0.16.04.3 | USN-3877-1 |
| Ubuntu 16.04 LTS | ssvnc | 1.0.29-2+deb8u1build0.16.04.1 | USN-4547-2 |
| Ubuntu 16.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 14.04 LTS | libvncserver | 0.9.9+dfsg-1ubuntu1.4 | USN-3877-1 |
| Ubuntu Pro 14.04 LTS | tightvnc | 1.3.9-6.5+deb8u1build0.14.04.1~esm1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | LibVNCServer | 0.9.10-4.3.1 | SUSE-SU-2019:0080-1 |
| SLES 12 SP4 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-1 |
| SLES 12 SP3 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-1 |
| SLES 12 SP2 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-1 |
| SLES 12 SP1 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-1 |
| SLES 11 SP4 | LibVNCServer | 0.9.1-160.6.1 | SUSE-SU-2019:13927-1 |
| SLES 11 SP3 | LibVNCServer | 0.9.1-160.6.1 | SUSE-SU-2019:13927-1 |
| SLES for SAP 12 SP4 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-1 |
| SLES for SAP 12 SP3 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-1 |
| SLES for SAP 12 SP2 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-1 |
| SLES for SAP 12 SP1 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-2 |
| SLES for SAP 11 SP4 | LibVNCServer | 0.9.1-160.6.1 | SUSE-SU-2019:13927-1 |
| SUSE OpenStack Cloud 7 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | LibVNCServer | 0.9.1-160.6.1 | SUSE-SU-2019:13927-1 |
| SUSE Enterprise Storage 4 | LibVNCServer | 0.9.9-17.8.1 | SUSE-SU-2019:0060-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.0 | LibVNCServer | 0.9.10-lp150.3.3.1 | openSUSE-SU-2019:0053-1 |
Advisories 14
- USN-4547-1 italc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4587-1 italc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4547-2 ssvnc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-3877-1 libvncserver vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4383-1 libvncserver - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2045-1 tightvnc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2016-1 ssvnc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1979-1 italc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1617-1 libvncserver - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2019:0053-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:13927-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0060-2 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0080-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0060-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
References
- DSA-4383 vendor-advisory
- [debian-lts-announce] 20181227 [SECURITY] [DLA 1617-1] libvncserver security update mailing-list
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-032-libvnc-multiple-memory-leaks/
- USN-3877-1 vendor-advisory
- GLSA-201908-05 vendor-advisory
- [debian-lts-announce] 20191030 [SECURITY] [DLA 1979-1] italc security update mailing-list
- [debian-lts-announce] 20191129 [SECURITY] [DLA 2016-1] ssvnc security update mailing-list
- [debian-lts-announce] 20191221 [SECURITY] [DLA 2045-1] tightvnc security update mailing-list
- GLSA-202006-06 vendor-advisory
- USN-4547-1 vendor-advisory
- USN-4547-2 vendor-advisory
- USN-4587-1 vendor-advisory