CVE-2026-108039: By default, StaxUtils placed no limit on the total number of elements or the total number of characters in an

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HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-108039 is a high-severity flaw (CVSS 7.5) affecting cxf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

By default, StaxUtils placed no limit on the total number of elements or the total number of characters in an XML document. A very large request could therefore use a lot of memory and CPU during parsing, especially where CXF builds a DOM from the input (for example SAAJ or WS-Security), and could cause a denial of service when no request size limit was configured. Both limits now have defaults: the maximum element count is 100 × maxChildElements

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	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-776
Published	2026-10-09
Last modified	2026-10-16

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

Last updated 2026-10-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-09 11:17 UTCPublished CVE record published
2026-10-16 18:04 UTCUpdated Record last modified

apache cxf UPGRADE

Affected: < 3.6.13 · >= 4.0.0 and < 4.1.9 · >= 4.2.0 and < 4.2.4

Fixed in: 3.6.13, 4.1.9, 4.2.4

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to 3.6.13 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cxf

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 4.0.0 (Debian / Ubuntu)

apt-cache madison cxf sudo apt install cxf=<VERSION_BEFORE_4.0.0> sudo apt-mark hold cxf

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

dnf --showduplicates list cxf sudo dnf downgrade cxf-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add cxf

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.

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-2026-108039?

cxf: upgrade to 3.6.13, 4.1.9, 4.2.4. Exact commands for each OS are on this page.

Is CVE-2026-108039 being exploited?

CVE-2026-108039 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-2026-108039 affect?

CVE-2026-108039 affects cxf. Severity is high (CVSS 7.5). By default, StaxUtils placed no limit on the total number of elements or the total number of characters in an XML document. A very large request could therefore use a lot of memory and CPU during parsing, especially where CXF builds a DOM f

How urgent is CVE-2026-108039?

Priority 46/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

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References

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