Patch Forecast
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CVE-2026-86463

Apache Cxf: denial of service

Risk score
58/100
CVSS
7.5 v3.1
Exploit chance (30 days)
0.4%
Published
9 Oct 2026

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What to know

What it is
Apache CXF's FIQL query parser has a vulnerability in how it searches for operators in query expressions. The search pattern can get stuck trying many combinations when it encounters a long string without an operator, causing the parser to consume excessive CPU time. An attacker can send a crafted query to make the se…
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-2026-86463Denial of serviceCVSS 7.5 · 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-2026-107938In Apache CXF, theNetty-based HTTP clienttransport…CVSS 9.1 · 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 weaknessDenial of service (CWE-400)253 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-2026-86463: Denial of service (CVSS 7.5 · 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-2026-107938: In Apache CXF, the Netty-based HTTP client transport (cxf-rt-transports-http-netty-client) did not… (CVSS 9.1 · 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 Yellow

  • CVSS 7.5 high
  • Remotely exploitable without logging in

References

Original description

Apache CXF's FIQL query parser has a vulnerability in how it searches for operators in query expressions. The search pattern can get stuck trying many combinations when it encounters a long string without an operator, causing the parser to consume excessive CPU time. An attacker can send a crafted query to make the server use up CPU resources, potentially slowing down or stopping other requests. The fix was to limit FIQL expressions to 4 KiB by default, preventing attackers from sending extremely long inputs while still allowing normal queries. 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.