CVE-2026-50538

unknown

Published 2026-07-02 · Modified —

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

—

Description

LibVNCServer vulnerability

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2026-50538 NameCVE-2026-50538 DescriptionAttacker-controlled heap out-of-bounds write in libvncclient Tight decoder SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) Debian Bugs1138253 Vulnerable and fixed packages The table below lists information on source packages. Source…

CVE-2026-50538

Name	CVE-2026-50538
Description	Attacker-controlled heap out-of-bounds write in libvncclient Tight decoder
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1138253

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libvncserver (PTS)	bullseye	0.9.13+dfsg-2+deb11u1	vulnerable
	bookworm	0.9.14+dfsg-1+deb12u1	vulnerable
	trixie	0.9.15+dfsg-1+deb13u1	vulnerable
	forky	0.9.15+dfsg-5	vulnerable
	sid	0.9.15+dfsg-6	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libvncserver	source	(unstable)	0.9.15+dfsg-6			1138253

Notes

[trixie] - libvncserver <no-dsa> (Minor issue)
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-v9pm-47h4-jcq8

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

[trixie] - libvncserver <no-dsa> (Minor issue)https://github.com/LibVNC/libvncserver/security/advisories/GHSA-v9pm-47h4-jcq8

OS impact

Debian Mixed 5 releases

Version	Status	Fixed in
trixie	Affected	—
sid	Fixed	`0.9.15+dfsg-6`
forky	Fixed	`0.9.15+dfsg-6`
bullseye	Affected	—
bookworm	Affected	—

Ubuntu Fixed 4 releases

Version	Status	Fixed in
resolute	Fixed	`0.9.15+dfsg-3ubuntu0.2`
questing	Fixed	`0.9.15+dfsg-1ubuntu0.2`
noble	Fixed	`0.9.14+dfsg-1ubuntu0.2`
jammy	Fixed	`0.9.13+dfsg-3ubuntu0.2`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.