Skip to content
VulniPulse
Sign in
Highest advisory severityCritical 3 vendors · 3 advisories

CVE-2026-59083

Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security…

CVE-2026-59083: Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security…. Not in the CISA KEV catalog.

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.

NVD detail CVE.org

Get an email when Apache publishes the next one.

VulniPulse checks Apache's security advisories around the clock and emails you new ones with the severity, the fixed version and the vendor's link. First month free, then US$15/month; we email you before the first charge.

Start your free month

CVE-2026-59083 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
Critical
CVSS base score
9.1 (Apache), 9.1 (NetApp), 3.7 (Red Hat)
CVSS vector
  • CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N (Red Hat)
Weakness
CWE-807
Fixed releases
  • Apache: 11.0.24, 10.1.57, 9.0.120
  • Red Hat: 11.0.24, 10.1.57, 9.0.120, tomcat9-1:9.0.120-1.el10_2, tomcat9-1:9.0.120-1.el10_0, tomcat-1:9.0.120-1.el8_10 and 27 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-2026-59083; bulletin-wide values are not repeated here.

Is CVE-2026-59083 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-59083 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-2026-59083?

Upgrade to a fixed release named by the vendor:

  • Apache: 11.0.24, 10.1.57, 9.0.120
  • Red Hat: 11.0.24, 10.1.57, 9.0.120, tomcat9-1:9.0.120-1.el10_2, tomcat9-1:9.0.120-1.el10_0, tomcat-1:9.0.120-1.el8_10
  • Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue. (Apache)
  • To mitigate this issue, review Apache Tomcat's rewrite valve configurations. If the rewrite valve is not essential for your application, consider disabling it. If it is required, ensure its configuration does not permit improper URL encoding that could lead to security constraint bypasses. A service restart may be required for changes to take effect. (Red Hat)

Vendor advisory comparison

Apache

1 advisory
  • Advisory severityCritical9.1

    Critical [CVE-2026-59083] Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security…

    CVE-2026-59083Source published Source updated

    Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.

    Affected products in this advisory
    • Apache Tomcat
    Source-reported affected versions
    • 11.0.0-M1 through 11.0.23
    • 10.1.0-M1 through 10.1.56
    • 9.0.0.M1 through 9.0.119
    • 8.5.0 through 8.5.100.

    1 more entries in the full advisory.

    Source-reported fixed versions
    • 11.0.24
    • 10.1.57
    • 9.0.120
    Mitigation guidance
    • Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.
    Full advisory and evidenceOpen source bulletin

NetApp

1 advisory
  • Advisory severityCritical9.1

    Critical [CVE-2026-59083] Apache Tomcat Vulnerability in NetApp Products

    NTAP-20260717-0018Source published Source updated

    Apache Tomcat versions 11.0.0-M1 through 11.0.23, 10.1.0-M1 through 10.1.56, 9.0.0.M1 through 9.0.119, and 8.5.0 through 8.5.100 are susceptible to a vulnerability which when successfully exploited could lead to disclosure of sensitive information, addition or modification of data. 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
    • 11.0.23
    • 10.1.0
    • 10.1.56

    4 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 severityLow3.7

    Low [CVE-2026-59083] Security constraint bypass via improper URL encoding in rewrite valve

    CVE-2026-59083Source published Source updated

    Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue. A remote attacker could exploit this to bypass security constraints in certain configurations, potentially gaining unauthorized access or performing actions that should be restricted. Exploitation requires specific configurations and has high attack complexity, limiting its overall risk to Red Hat products. Red Hat…

    Affected products in this advisory
    • Red Hat Enterprise Linux 10.0 Extended Update Support
    • Red Hat Enterprise Linux 8.8 Telecommunications Update Service
    • Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
    • Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

    16 more entries in the full advisory.

    Source-reported affected versions
    • 11.0.0
    • 11.0.23
    • 10.1.0
    • 10.1.56

    4 more entries in the full advisory.

    Source-reported fixed versions
    • 11.0.24
    • 10.1.57
    • 9.0.120
    • tomcat9-1:9.0.120-1.el10_2

    29 more entries in the full advisory.

    Mitigation guidance
    • To mitigate this issue, review Apache Tomcat's rewrite valve configurations. If the rewrite valve is not essential for your application, consider disabling it. If it is required, ensure its configuration does not permit improper URL encoding that could lead to security constraint bypasses. A service restart may be required for changes to take effect.
    Full advisory and evidenceOpen source bulletin

More Apache advisories

All Apache advisories

Follow CVE-2026-59083 in the free weekly digest

Every Monday: whether it was added to CISA KEV, reported exploited, got a fix or changed severity, plus the week's critical and high advisories.

Free, no account. Confirm by email; unsubscribe in one click. Choose vendors and severity

Browse the latest tracked CVEs or the CVEs listed in CISA KEV.

Android app · Google Play

Get alerts for new CVEs on your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery
Get CVE alertsSee app features