CVE-2026-109088
libXtst RECORD EnableContext Reply Endless Loop
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
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
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
libXtst RECORD EnableContext Reply Endless Loop
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
- Record
CVE-2026-109088- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-835
- Updated
- 2026-11-04
EUVDEUVD-2026-111114
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
- Record
EUVD-2026-111114- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-04
GitHub AdvisoriesGHSA-4rpx-8967-p725
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client...
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
- Record
GHSA-4rpx-8967-p725- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-835
- Updated
- 2026-11-02
NVD
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
- Record
CVE-2026-109088- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-835
- Updated
- 2026-11-04
OSVALPINE-CVE-2026-109088
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
- Record
ALPINE-CVE-2026-109088- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVBELL-CVE-2026-109088
- Record
BELL-CVE-2026-109088- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-04
Show 10 moreShow less
OSV
libXtst RECORD EnableContext Reply Endless Loop
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
- Record
CVE-2026-109088- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-835
- Updated
- 2026-11-05
OSVDEBIAN-CVE-2026-109088
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
- Record
DEBIAN-CVE-2026-109088- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-05
OSVOESA-2026-4572
libXtst security update
X.Org X11 libXtst runtime library
Security Fix(es):
X.Org reports: Multiple issues have been found in the X client library implementations published by X.Org for which we are releasing security fixes for.(CVE-2026-109088)
- Record
OESA-2026-4572- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVOESA-2026-4573
libXtst security update
X.Org X11 libXtst runtime library
Security Fix(es):
X.Org reports: Multiple issues have been found in the X client library implementations published by X.Org for which we are releasing security fixes for.(CVE-2026-109088)
- Record
OESA-2026-4573- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVOESA-2026-4574
libXtst security update
X.Org X11 libXtst runtime library
Security Fix(es):
X.Org reports: Multiple issues have been found in the X client library implementations published by X.Org for which we are releasing security fixes for.(CVE-2026-109088)
- Record
OESA-2026-4574- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVOESA-2026-4575
libXtst security update
X.Org X11 libXtst runtime library
Security Fix(es):
X.Org reports: Multiple issues have been found in the X client library implementations published by X.Org for which we are releasing security fixes for.(CVE-2026-109088)
- Record
OESA-2026-4575- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-109088
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
- Record
UBUNTU-CVE-2026-109088- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVAZL-111172 No score
CVE-2026-109088 affecting package libXtst for versions less than 1.2.6-1
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
- Record
AZL-111172- Updated
- 2026-11-06
OSVMGASA-2026-0543 No score
Updated libxtst, libxrender, libxi packages fix security vulnerabilities
The updated packages fix security vulnerabilities: libXi XGetDeviceControl Control Type Mismatch Heap Buffer Overflow. (CVE-2026-109089) libXi XGetDeviceControl DEVICE_ENABLE Heap Buffer Overflow. (CVE-2026-109090) Out-of-bounds read in libXrender's XRenderQueryFormat reply parser. (CVE-2026-88807) libXtst RECORD EnableContext Reply Endless Loop. (CVE-2026-109088)
- Record
MGASA-2026-0543- Updated
- 2026-11-02
OSVopenSUSE-SU-2026:12155-1 No score
libXtst-devel-1.2.5-3.1 on GA media
These are all security issues fixed in the libXtst-devel-1.2.5-3.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:12155-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libxtstAlpine:v3.24 |
before 1.2.6-r0 | 1.2.6-r0 |
libXtstAzure Linux:3 |
before 1.2.6-1 | 1.2.6-1 |
libxtstAlpaquita:23 |
1.2.4-r0 up to 1.2.6-r0 | 1.2.6-r0 |
libxtstAlpaquita:25 |
1.2.5-r0 up to 1.2.6-r0 | 1.2.6-r0 |
libxtstAlpaquita:stream |
1.2.4-r0 up to 1.2.6-r0 | 1.2.6-r0 |
libxtstDebian:12 |
All versions, plus listed versions 2:1.2.3-1.12:1.2.5-12:1.2.6-1 |
None known |
libxtstDebian:13 |
All versions, plus listed versions 2:1.2.5-12:1.2.6-1 |
None known |
libxtstDebian:14 |
before 2:1.2.6-1, plus listed versions 2:1.2.5-1 |
2:1.2.6-1 |
libxtstMageia:10 From an advisory covering 4 CVEs |
before 1.2.5-2.2.mga10 | 1.2.5-2.2.mga10 |
libxrenderMageia:10 From an advisory covering 4 CVEs |
before 0.9.12-2.1.mga10 | 0.9.12-2.1.mga10 |
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| Package | Affected | Fixed |
|---|---|---|
libxiMageia:10 From an advisory covering 4 CVEs |
before 1.8.2-2.2.mga10 | 1.8.2-2.2.mga10 |
libXtstopenEuler:22.03-LTS-SP4 |
before 1.2.4-4.oe2203sp4 | 1.2.4-4.oe2203sp4 |
libXtstopenEuler:24.03-LTS-SP1 |
before 1.2.4-4.oe2403sp1 | 1.2.4-4.oe2403sp1 |
libXtstopenEuler:24.03-LTS-SP3 |
before 1.2.4-4.oe2403sp3 | 1.2.4-4.oe2403sp3 |
libXtstopenEuler:24.03-LTS-SP4 |
before 1.2.4-4.oe2403sp4 | 1.2.4-4.oe2403sp4 |
libxtstUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 2:1.2.2-12:1.2.2-1ubuntu0.1~esm1 |
None known |
libxtstUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 2:1.2.3-12:1.2.3-1ubuntu0.18.04.1~esm1 |
None known |
libxtstUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 2:1.2.3-12:1.2.3-1ubuntu0.20.04.1~esm1 |
None known |
libxtstUbuntu:22.04:LTS |
All versions, plus listed versions 2:1.2.3-1build22:1.2.3-1build32:1.2.3-1build42:1.2.3-1ubuntu0.22.04.1 |
None known |
libxtstUbuntu:24.04:LTS |
All versions, plus listed versions 2:1.2.3-1.12:1.2.3-1.1build12:1.2.3-1.1ubuntu0.1 |
None known |
libxtstUbuntu:26.10 |
All versions, plus listed versions 2:1.2.5-1build12:1.2.5-1ubuntu1 |
None known |
libxtstUbuntu:26.04:LTS |
All versions, plus listed versions 2:1.2.5-12:1.2.5-1build12:1.2.5-1ubuntu0.1 |
None known |
libXtstopenSUSE:Tumbleweed |
before 1.2.5-3.1 | 1.2.5-3.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | OSV | |
| affected | CVE List, EUVD, NVD, OSV | |
| affected, facts | OSV | |
| affected | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-109088 is a medium vulnerability (CVSS 6.5) in X.org Libxtst, published October 16, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 19th percentile. Fixed in libxtst 1.2.6-r0.
References
gitlab.freedesktop.org/xorg/lib/libxtst/-/merge_requests/11
nvd.nist.gov/vuln/detail/CVE-2026-109088
github.com/advisories/GHSA-4rpx-8967-p725
security.alpinelinux.org/vuln/CVE-2026-109088
docs.bell-sw.com/security/cves/CVE-2026-109088
Show 14 moreShow less
security-tracker.debian.org/tracker/CVE-2026-109088
advisories.mageia.org/MGASA-2026-0543.html
bugs.mageia.org/show_bug.cgi?id=36533
openwall.com/lists/oss-security/2026/10/16/37
lists.x.org/archives/xorg-announce/2026-October/thread.html
openeuler.org/zh/security/security-bulletins/detail?id=openEuler-SA-2026-4572
ubuntu.com/security/CVE-2026-109088
cve.org/CVERecord?id=CVE-2026-109088
suse.com/security/cve/CVE-2026-109088