HighFix available
tomcat10, tomcat11 and 1 more products — security advisory
Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.
- Products
- tomcat10, tomcat11, tomcat9
- Affected versions
- 10.1.10-1, 10.1.13-1, 10.1.14-1, 10.1.15-1, 10.1.16-1, 10.1.20-1, 10.1.23-1, 10.1.25-1, 10.1.25-1~bpo12+1, 10.1.25-2, 10.1.30-1, 10.1.30-1~bpo12+1, 10.1.31-1, 10.1.33-1, 10.1.33-1~bpo12+1, 10.1.34-0+deb12u1, 10.1.34-0+deb12u2, 10.1.34-1, 10.1.35-1, 10.1.40-1, 10.1.40-1~bpo12+1, 10.1.46-1, 10.1.52-1~deb12u1, 10.1.6-1, 10.1.6-1+deb12u1, 10.1.6-1+deb12u2, 10.1.7-1, 10.1.8-1, 10.1.9-1, 11.0.11-1, 11.0.6-1
- Fixed versions
- 10.1.40-1, 10.1.52-1~deb12u1, 10.1.52-1~deb13u1, 11.0.15-1~deb13u1, 11.0.5-1, 9.0.70-2
- CVEs
- CVE-2026-55957
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:21 UTC · Revision 2
Source evidence
Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.
osv:DEBIAN-CVE-2026-55957
tomcat10
Fixed versions: 10.1.52-1~deb12u1
tomcat10
Fixed versions: 10.1.52-1~deb13u1
tomcat10
Fixed versions: 10.1.40-1
tomcat11
Fixed versions: 11.0.15-1~deb13u1
tomcat11
Fixed versions: 11.0.5-1
tomcat9
Fixed versions: 9.0.70-2
tomcat9
Fixed versions: 9.0.70-2
tomcat9
Fixed versions: 9.0.70-2
Complete source record
{
"id": "c8b11b4b2aac6cbf0e8c89281388dbb055b44b387a165a528669f8252fab7e09",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-55957",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-55957",
"summary": "Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.",
"evidence": "osv:DEBIAN-CVE-2026-55957",
"products": [
{
"name": {
"value": "tomcat10",
"evidence": "/affected/0/package/name"
},
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"fixed_versions": [
{
"value": "10.1.52-1~deb12u1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "10.1.10-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.13-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.14-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.15-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.16-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.20-1",
"evidence": "/affected/0/versions"
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{
"value": "10.1.23-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.25-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.25-1~bpo12+1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.25-2",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.30-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.30-1~bpo12+1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.31-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.33-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.33-1~bpo12+1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.34-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.34-0+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.34-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.35-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.40-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.40-1~bpo12+1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.46-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.6-1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "10.1.7-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.8-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.9-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "10.1.52-1~deb13u1",
"evidence": "/affected/1/ranges"
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],
"affected_versions": [
{
"value": "10.1.40-1",
"evidence": "/affected/1/versions"
},
{
"value": "10.1.46-1",
"evidence": "/affected/1/versions"
},
{
"value": "10.1.52-1~deb12u1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "tomcat10",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "10.1.40-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat11",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "11.0.15-1~deb13u1",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": [
{
"value": "11.0.11-1",
"evidence": "/affected/3/versions"
},
{
"value": "11.0.6-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "tomcat11",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "11.0.5-1",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.70-2",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.70-2",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.70-2",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-55957",
"aliases": [
"DEBIAN-CVE-2026-55957"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "10.1.52-1~deb12u1"
}
]
}
],
"package": {
"name": "tomcat10",
"purl": "pkg:deb/debian/tomcat10?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"10.1.13-1",
"10.1.14-1",
"10.1.15-1",
"10.1.16-1",
"10.1.20-1",
"10.1.23-1",
"10.1.25-1",
"10.1.25-1~bpo12+1",
"10.1.25-2",
"10.1.30-1",
"10.1.30-1~bpo12+1",
"10.1.31-1",
"10.1.33-1",
"10.1.33-1~bpo12+1",
"10.1.34-0+deb12u1",
"10.1.34-0+deb12u2",
"10.1.34-1",
"10.1.35-1",
"10.1.40-1",
"10.1.40-1~bpo12+1",
"10.1.46-1",
"10.1.6-1",
"10.1.6-1+deb12u1",
"10.1.6-1+deb12u2",
"10.1.7-1",
"10.1.8-1",
"10.1.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55957.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "10.1.52-1~deb13u1"
}
]
}
],
"package": {
"name": "tomcat10",
"purl": "pkg:deb/debian/tomcat10?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"10.1.40-1",
"10.1.46-1",
"10.1.52-1~deb12u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55957.json"
},
"ecosystem_specific": {
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}
},
{
"ranges": [
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],
"package": {
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"purl": "pkg:deb/debian/tomcat10?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
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"package": {
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"versions": [
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"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55957.json"
},
"ecosystem_specific": {
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},
{
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"package": {
"name": "tomcat9",
"purl": "pkg:deb/debian/tomcat9?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55957.json"
},
"ecosystem_specific": {
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}
},
{
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],
"package": {
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"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55957.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
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{
"type": "ECOSYSTEM",
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},
{
"fixed": "9.0.70-2"
}
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}
],
"package": {
"name": "tomcat9",
"purl": "pkg:deb/debian/tomcat9?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55957.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T11:47:35.117353873Z",
"provider": "osv",
"upstream": [
"CVE-2026-55957"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-55957"
]
},
"related_cves": [
{
"value": "CVE-2026-55957",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450901,
"published_at": "2026-06-29T21:16:45.7+00:00"
}