CVE catalog

CVE-2026-76183

Authentication Bypass by Alternate Name vulnerability…

Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121. The following versions were EOS at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Sep 16, 2026, 3:12:00 PM UTC
Updated: Sep 23, 2026, 12:17:06 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.57% · Oct 27, 2026

Projects and upstream resources

[tomcat10][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "tomcat9",
      "status": "fixed",
      "release": "sid",
      "version": "9.0.122-1"
    },
    {
      "name": "tomcat9",
      "status": "fixed",
      "release": "forky",
      "version": "9.0.122-1"
    },
    {
      "name": "tomcat9",
      "status": "fixed",
      "release": "trixie",
      "version": "9.0.95-1"
    },
    {
      "name": "tomcat9",
      "status": "fixed",
      "release": "bookworm",
      "version": "9.0.70-2"
    },
    {
      "name": "tomcat10",
      "status": "fixed",
      "release": "sid",
      "version": "10.1.60-1"
    },
    {
      "name": "tomcat10",
      "status": "fixed",
      "release": "forky",
      "version": "10.1.60-1"
    },
    {
      "name": "tomcat10",
      "status": "vulnerable",
      "release": "trixie",
      "version": "10.1.55-1~deb13u1"
    },
    {
      "name": "tomcat10",
      "status": "vulnerable",
      "release": "trixie-security",
      "version": "10.1.55-1~deb13u1"
    },
    {
      "name": "tomcat10",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "10.1.55-1~deb12u1"
    },
    {
      "name": "tomcat10",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "10.1.55-1~deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "tomcat9",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "9.0.70-2"
    },
    {
      "bug": null,
      "name": "tomcat9",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "9.0.70-2"
    },
    {
      "bug": null,
      "name": "tomcat9",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "9.0.70-2"
    },
    {
      "bug": null,
      "name": "tomcat9",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "9.0.70-2"
    },
    {
      "bug": null,
      "name": "tomcat10",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "10.1.60-1"
    },
    {
      "bug": null,
      "name": "tomcat10",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "10.1.60-1"
    },
    {
      "bug": null,
      "name": "tomcat10",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "tomcat10",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": []
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libtomcat10-embed-java]Unknown
Source package: [tomcat10]
Details (6)
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
[libtomcat10-java]Unknown
Source package: [tomcat10]
Details (6)
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
[libtomcat9-java]Unknown
Source package: [tomcat9]
Details (2)
- 9.0.70-2 · all · bookworm
  Fixed · Fixed: 9.0.70-2
  nvd · tomcat9 · debian · bookworm; nvd · tomcat9 · debian · 12
- 9.0.70-2 · all · bookworm
  Fixed · Fixed: 9.0.70-2
  nvd · tomcat9 · debian · bookworm; nvd · tomcat9 · debian · 12
[tomcat10]Unknown
Details (6)
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
[tomcat10-admin]Unknown
Source package: [tomcat10]
Details (6)
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
[tomcat10-common]Unknown
Source package: [tomcat10]
Details (6)
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
[tomcat10-docs]Unknown
Source package: [tomcat10]
Details (6)
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
[tomcat10-examples]Unknown
Source package: [tomcat10]
Details (6)
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
[tomcat10-user]Unknown
Source package: [tomcat10]
Details (6)
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.40-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12
- 10.1.55-1~deb12u1 · all · bookworm-security
  Affected
  nvd · tomcat10 · debian · bookworm; nvd · tomcat10 · debian · 12

[Debian 13 (Trixie)]

[libtomcat10-embed-java]Unknown
Source package: [tomcat10]
Details (4)
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
[libtomcat10-java]Unknown
Source package: [tomcat10]
Details (4)
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
[libtomcat11-embed-java]Unknown
Source package: [tomcat11]
Details (4)
- 11.0.22-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat11 · debian · 13
- 11.0.22-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat11 · debian · 13
- 11.0.22-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat11 · debian · 13
- 11.0.22-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat11 · debian · 13
[libtomcat11-java]Unknown
Source package: [tomcat11]
Details (4)
- 11.0.22-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat11 · debian · 13
- 11.0.22-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat11 · debian · 13
- 11.0.22-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat11 · debian · 13
- 11.0.22-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat11 · debian · 13
[libtomcat9-java]Unknown
Source package: [tomcat9]
Details (2)
- 9.0.95-1 · all · trixie
  Fixed · Fixed: 9.0.70-2
  nvd · tomcat9 · debian · 13
- 9.0.95-1 · all · trixie
  Fixed · Fixed: 9.0.70-2
  nvd · tomcat9 · debian · 13
[tomcat10]Unknown
Details (4)
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
[tomcat10-admin]Unknown
Source package: [tomcat10]
Details (4)
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
[tomcat10-common]Unknown
Source package: [tomcat10]
Details (4)
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
[tomcat10-docs]Unknown
Source package: [tomcat10]
Details (4)
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
[tomcat10-examples]Unknown
Source package: [tomcat10]
Details (4)
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
[tomcat10-user]Unknown
Source package: [tomcat10]
Details (4)
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13
- 10.1.55-1~deb13u1 · all · trixie-security
  Affected
  nvd · tomcat10 · debian · 13

Next results

Observed: Oct 27, 2026, 6:14:09 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]