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Highest advisory severityHigh 3 vendors · 3 advisories

CVE-2026-65927

Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule

CVE-2026-65927: Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the…

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2026-65927 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
High
CVSS base score
8.2 (Red Hat), 7.5 (Apache), 7.5 (NetApp)
CVSS vector
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N (Red Hat)
Weakness
CWE-193
Fixed releases
  • Apache: 11.0.25, 10.1.58, 9.0.121
  • Red Hat: 11.0.25, 10.1.58, 9.0.121, tomcat, jws6-tomcat-0:10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-0:10.1.49-16.redhat_00016.1.el8jws and 7 more in the advisory
Vendor advisories
3 from Apache, NetApp, Red Hat
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-65927; bulletin-wide values are not repeated here.

Is CVE-2026-65927 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-65927 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-65927?

Upgrade to a fixed release named by the vendor:

  • Apache: 11.0.25, 10.1.58, 9.0.121
  • Red Hat: 11.0.25, 10.1.58, 9.0.121, tomcat, jws6-tomcat-0:10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-0:10.1.49-16.redhat_00016.1.el8jws
  • Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue. (Apache)
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (Red Hat)

Vendor advisory comparison

Apache

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-65927] Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule

    CVE-2026-65927Source published Source updated

    Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.

    Affected products in this advisory
    • Apache Tomcat
    Source-reported affected versions
    • 11.0.0-M1 through 11.0.24
    • 10.1.0-M1 through 10.1.57
    • 9.0.0.M1 through 9.0.120.
    • 8.5.0 through 8.5.100.

    2 more entries in the full advisory.

    Source-reported fixed versions
    • 11.0.25
    • 10.1.58
    • 9.0.121
    Mitigation guidance
    • Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.
    Full advisory and evidenceOpen source bulletin

NetApp

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-65927] Apache Tomcat Vulnerability in NetApp Products

    NTAP-20260902-0017Source published Source updated

    Apache Tomcat versions 11.0.0-M1 through 11.0.24, 10.1.0-M1 through 10.1.57, and 9.0.0.M1 through 9.0.120 are susceptible to a vulnerability which when successfully exploited could lead to Denial of Service (DoS). Successful exploitation of this vulnerability could lead to Denial of Service (DoS). NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.

    Affected products in this advisory
    No product details extracted. Check the source bulletin.
    Source-reported affected versions
    • 11.0.0
    • 11.0.24
    • 10.1.0
    • 10.1.57

    2 more entries in the full advisory.

    Source-reported fixed versions
    No fixed-version detail extracted. This does not mean no fix exists.
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh8.2

    High [CVE-2026-65927] Access control bypass due to off-by-one error in RewriteValve [N] flag processing

    CVE-2026-65927Source published Source updated

    Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue. This vulnerability may allow an attacker to bypass intended access controls. This vulnerability can lead to an access control bypass, allowing unauthorized access to resources in applications that utilize the RewriteValve with…

    Affected products in this advisory
    • Red Hat JBoss Web Server 6.2.5
    • Red Hat JBoss Web Server 6.2 on RHEL 10
    • Red Hat JBoss Web Server 6.2 on RHEL 8
    • Red Hat JBoss Web Server 6.2 on RHEL 9

    11 more entries in the full advisory.

    Source-reported affected versions
    • 11.0.0
    • 11.0.24
    • 10.1.0
    • 10.1.57

    4 more entries in the full advisory.

    Source-reported fixed versions
    • 11.0.25
    • 10.1.58
    • 9.0.121
    • tomcat

    9 more entries in the full advisory.

    Mitigation guidance
    • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    Full advisory and evidenceOpen source bulletin

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