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CVE-2026-64958: An incomplete fix for CVE-2026-50645 means that it is still possible to perform a denial of service attack on

49
This month
HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-64958 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.

An incomplete fix for CVE-2026-50645 means that it is still possible to perform a denial of service attack on Apache CXF by sending a message with many attachment headers. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix 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 score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.7% (top 49%)
CISA exploited listNo
WeaknessCWE-400
Published2026-08-06
Last modified2026-10-23
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

apache cxf UPGRADE
Affected: < 3.6.12 · >= 4.0.0 and < 4.1.8 · >= 4.2.0 and < 4.2.3
Fixed in: 3.6.12, 4.1.8, 4.2.3
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 3.6.12 (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.

Exact fixes by distribution

Fedora 46 · python-fontconfig · FIXED · 0.6.3-1.fc46 · FEDORA-2026-f92ca8b01f · source
sudo dnf upgrade --advisory=FEDORA-2026-f92ca8b01f
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
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-2026-64958?

cxf: upgrade to 3.6.12, 4.1.8, 4.2.3. Exact commands for each OS are on this page.

Is CVE-2026-64958 being exploited?

CVE-2026-64958 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-2026-64958 affect?

CVE-2026-64958 affects cxf. Severity is high (CVSS 7.5). An incomplete fix for CVE-2026-50645 means that it is still possible to perform a denial of service attack on Apache CXF by sending a message with many attachment headers. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.1

How urgent is CVE-2026-64958?

Priority 49/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

References

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