CVE-2026-61899: Vulnerability in tapestry-core in Apache Tapestry 5.5.0+ on all platforms allows attackers to download clsspat

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-61899 is a high-severity flaw (CVSS 7.5) affecting tapestry. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in tapestry-core in Apache Tapestry 5.5.0+ on all platforms allows attackers to download clsspath assets via specially crafted URLs. Users are recommended to upgrade to version 5.9.1, which fixes this issue.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-08-10
Last modified	2026-10-23

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-10 11:17 UTCPublished CVE record published
2026-10-23 20:10 UTCUpdated Record last modified

apache tapestry UPGRADE

Affected: >= 5.5.0 and < 5.9.1

Fixed in: 5.9.1

Safe to downgrade to: a release before 5.5.0

1. Check installed version

apt-cache policy tapestry || rpm -q tapestry || tapestry --version

2. UPGRADE to 5.9.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tapestry

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tapestry

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 5.5.0 (Debian / Ubuntu)

apt-cache madison tapestry sudo apt install tapestry=<VERSION_BEFORE_5.5.0> sudo apt-mark hold tapestry

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

dnf --showduplicates list tapestry sudo dnf downgrade tapestry-<VERSION_BEFORE_5.5.0> sudo dnf versionlock add tapestry

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 · clementine · FIXED · 1.4.2-1.fc46 · FEDORA-2026-3e748ef4d3 · source

sudo dnf upgrade --advisory=FEDORA-2026-3e748ef4d3

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-2026-61899?

tapestry: upgrade to 5.9.1. Exact commands for each OS are on this page.

Is CVE-2026-61899 being exploited?

CVE-2026-61899 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-2026-61899 affect?

CVE-2026-61899 affects tapestry. Severity is high (CVSS 7.5). Vulnerability in tapestry-core in Apache Tapestry 5.5.0+ on all platforms allows attackers to download clsspath assets via specially crafted URLs. Users are recommended to upgrade to version 5.9.1, which fixes this issue.

How urgent is CVE-2026-61899?

Priority 50/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

References

← Back to latest CVEs