CVE-2026-107937: In Apache CXF, the parser for multipart/MTOM attachment part headers did not fully enforce the configured atta

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HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-107937 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.

In Apache CXF, the parser for multipart/MTOM attachment part headers did not fully enforce the configured attachment-max-header-size (default 300 characters) and attachment-headers-max-count (default 500) limits. The size limit was applied only to each physical line, not to a header value built from continuation lines or to the combined values of a repeated header. The count limit was checked against the number of distinct header names, not the t

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	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-770
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 18:10 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-2026-107937?

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

Is CVE-2026-107937 being exploited?

CVE-2026-107937 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-2026-107937 affect?

CVE-2026-107937 affects cxf. Severity is high (CVSS 7.5). In Apache CXF, the parser for multipart/MTOM attachment part headers did not fully enforce the configured attachment-max-header-size (default 300 characters) and attachment-headers-max-count (default 500) limits. The size limit was applied

How urgent is CVE-2026-107937?

Priority 48/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

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References

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