CVE-2026-14865: In Progress® Telerik® UI for AJAX prior to v2026.2.708, the internal LayoutBuilder control processes client-st

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-14865 is a medium-severity flaw (CVSS 5.3) affecting telerik ui for asp.net ajax. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Progress® Telerik® UI for AJAX prior to v2026.2.708, the internal LayoutBuilder control processes client-state XML without disabling DTD processing, allowing unauthenticated denial of service via recursive XML entity expansion.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-776
Published	2026-07-22
Last modified	2026-10-24

Publisher (CNA): Progress Software Corporation · Vendor: progress

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-22 14:17 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

progress telerik ui for asp.net ajax UPGRADE

Affected: >= 2009.31314 and < 2026.2.708

Fixed in: 2026.2.708

Safe to downgrade to: a release before 2009.31314

1. Check installed version

apt-cache policy telerik-ui-for-asp.net-ajax || rpm -q telerik-ui-for-asp.net-ajax || telerik-ui-for-asp.net-ajax --version

2. UPGRADE to 2026.2.708 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade telerik-ui-for-asp.net-ajax

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade telerik-ui-for-asp.net-ajax

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2009.31314 (Debian / Ubuntu)

apt-cache madison telerik-ui-for-asp.net-ajax sudo apt install telerik-ui-for-asp.net-ajax=<VERSION_BEFORE_2009.31314> sudo apt-mark hold telerik-ui-for-asp.net-ajax

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list telerik-ui-for-asp.net-ajax sudo dnf downgrade telerik-ui-for-asp.net-ajax-<VERSION_BEFORE_2009.31314> sudo dnf versionlock add telerik-ui-for-asp.net-ajax

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · sugar-calculator · FIXED · 47-14.fc46 · FEDORA-2026-38eeb9e279 · source

sudo dnf upgrade --advisory=FEDORA-2026-38eeb9e279

Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-14865?

telerik ui for asp.net ajax: upgrade to 2026.2.708. Exact commands for each OS are on this page.

Is CVE-2026-14865 being exploited?

CVE-2026-14865 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-14865 affect?

CVE-2026-14865 affects telerik ui for asp.net ajax. Severity is medium (CVSS 5.3). In Progress® Telerik® UI for AJAX prior to v2026.2.708, the internal LayoutBuilder control processes client-state XML without disabling DTD processing, allowing unauthenticated denial of service via recursive XML entity expansion.

How urgent is CVE-2026-14865?

Priority 33/100. Remotely exploitable, no login, no user action

Software pages

.NET vulnerabilities

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References

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