Patch Forecast
Amber warning
Patch this week.

CVE-2026-107938

In Apache CXF, the Netty-based HTTP client transport (cxf-rt-transports-http-netty-client) did not…

Risk score
62/100
CVSS
9.1 v3.1
Exploit chance (30 days)
0.2%
Published
9 Oct 2026

Open in the live forecast Today's forecast

What to know

What it is
In Apache CXF, the Netty-based HTTP client transport (cxf-rt-transports-http-netty-client) did not verify that the hostname in the server’s TLS certificate matched the host being called. This applied over both HTTP/1.1 and HTTP/2, even when disableCNCheck was left at its default value of false. The certificate chain w…
Affected
Apache Cxf before 4.2.4, 4.1.9, 3.6.13
Fix
Upgrade Apache Cxf to 4.2.4, 4.1.9 or 3.6.13 (whichever matches your release line), or later.
Exploitation
No known exploitation

Story map

Story map: Apache CxfTHE FLAWSTHE FIXCVE-2026-107938In Apache CXF, theNetty-based HTTP clienttransport…CVSS 9.1 · EPSS 0%CVE-2026-71575The max_ageauthentication-freshnesscheck in…CVSS 9.1 · EPSS 0%CVE-2026-97468Apache CXF'sSTSTokenValidator andSecurity Token Service (STS)…CVSS 9.1 · EPSS 0%CVE-2026-73179Improper enforcement ofsingle-use authorization codesemantics in the JPA OAuth2…CVSS 8.1 · EPSS 0%Upgrade Apache Cxf4.2.4 · 4.1.9 · 3.6.13or later on your release lineWho is exposedApache Cxf before 4.2.4, 4.1.9,3.6.13AMBER · PATCH THIS WEEKApache CxfThe max_ageauthentication-freshness checkin OidcClientCodeRequestFilterwas inoperative due to amilliseconds/seconds unitmismatch and an invertedcomparison polarity. Any…Where it standsNo known exploitationCONNECTS TOSame weaknessCWE-297 (CWE-297)6 other warnings in 30 days →Same productEarlier Apache Cxf warnings7 in the last 90 days →
Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

Apache Cxf: Amber, patch this week. The max_age authentication-freshness check in OidcClientCodeRequestFilter was inoperative due to a milliseconds/seconds unit mismatch and an inverted comparison polarity. Any relying party using setMaxAgeOffset to enforce re-authentication would silently accept sessions of any age, bypassing step-up authentication pol…

The flaws

  • CVE-2026-107938: In Apache CXF, the Netty-based HTTP client transport (cxf-rt-transports-http-netty-client) did not… (CVSS 9.1 · EPSS 0%)
  • CVE-2026-71575: The max_age authentication-freshness check in OidcClientCodeRequestFilter was inoperative due to a… (CVSS 9.1 · EPSS 0%)
  • CVE-2026-97468: Apache CXF's STSTokenValidator and Security Token Service (STS) cached validated security tokens… (CVSS 9.1 · EPSS 0%)
  • CVE-2026-73179: Improper enforcement of single-use authorization code semantics in the JPA OAuth2 authorization… (CVSS 8.1 · EPSS 0%)

The fix

Upgrade Apache Cxf: 4.2.4 · 4.1.9 · 3.6.13 or later on your release line

Who is exposed: Apache Cxf before 4.2.4, 4.1.9, 3.6.13

Where it stands

  • No known exploitation

Connects to

Why it is Amber

  • CVSS 9.1 critical
  • Remotely exploitable without logging in

References

Original description

In Apache CXF, the Netty-based HTTP client transport (cxf-rt-transports-http-netty-client) did not verify that the hostname in the server’s TLS certificate matched the host being called. This applied over both HTTP/1.1 and HTTP/2, even when disableCNCheck was left at its default value of false. The certificate chain was validated against the configured trust store, but the endpoint’s identity was not. A network attacker able to intercept traffic could present any certificate trusted by the client, such as a publicly issued certificate for a domain they control, and impersonate the target service. They could then read or modify the exchanged messages, including credentials.  Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.

Last activity 9 Oct 2026. Patch Forecast updates every hour.