Medium
netty — security advisory
A flaw was found in io.netty/netty-codec-memcache. The Memcache binary protocol codec incorrectly reads `keyLength` and `extrasLength` as signed Java types instead of unsigned, as specified by the protocol. A malicious Memcache server can exploit this type mismatch by sending a specially crafted response. This can lead to frame desynchronization and response smuggling, where one client's data may be inadvertently exposed to another client's response stream in proxy or cache environments.
- Products
- netty
- Affected versions
- 1:3.2.6.Final-2, 1:3.2.6.Final-2+deb8u2build0.14.04.1~esm1, 1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1, 1:4.0.32-1, 1:4.0.33-1, 1:4.0.34-1, 1:4.0.34-1ubuntu0.1~esm1, 1:4.0.34-1ubuntu0.1~esm2, 1:4.0.34-1ubuntu0.1~esm3, 1:4.0.34-1ubuntu0.1~esm4, 1:4.0.34-1ubuntu0.1~esm5, 1:4.1.33-1, 1:4.1.33-2, 1:4.1.33-3, 1:4.1.45-1, 1:4.1.45-1ubuntu0.1~esm1, 1:4.1.45-1ubuntu0.1~esm2, 1:4.1.45-1ubuntu0.1~esm3, 1:4.1.45-1ubuntu0.1~esm4, 1:4.1.45-1ubuntu0.1~esm6, 1:4.1.45-1ubuntu0.1~esm7, 1:4.1.48-10, 1:4.1.48-11, 1:4.1.48-12, 1:4.1.48-13, 1:4.1.48-14, 1:4.1.48-16, 1:4.1.48-16ubuntu0.1~esm2, 1:4.1.48-16ubuntu1, 1:4.1.48-4, 1:4.1.48-4+deb11u1build0.22.04.1, 1:4.1.48-4+deb11u2build0.22.04.1, 1:4.1.48-4+deb11u2ubuntu0.1, 1:4.1.48-4+deb11u2ubuntu0.1+esm1, 1:4.1.48-4+deb11u2ubuntu0.1+esm3, 1:4.1.48-4+deb11u2ubuntu0.1~esm1, 1:4.1.48-4+deb11u2ubuntu0.1~esm2, 1:4.1.48-4+deb11u2ubuntu0.2, 1:4.1.48-4+deb11u2ubuntu0.2+esm1, 1:4.1.48-7, 1:4.1.48-8, 1:4.1.48-9, 1:4.1.48-9ubuntu0.1, 1:4.1.48-9ubuntu0.1+esm1, 1:4.1.48-9ubuntu0.1+esm3, 1:4.1.48-9ubuntu0.1~esm1, 1:4.1.48-9ubuntu0.1~esm2, 1:4.1.48-9ubuntu0.2, 1:4.1.48-9ubuntu0.2+esm1, 1:4.1.48-9ubuntu0.2+esm2, 1:4.1.7-4, 1:4.1.7-4ubuntu0.1, 1:4.1.7-4ubuntu0.1+esm1, 1:4.1.7-4ubuntu0.1+esm2, 1:4.1.7-4ubuntu0.1+esm3, 1:4.1.7-4ubuntu0.1+esm4, 1:4.1.7-4ubuntu0.1+esm5, 1:4.1.7-4ubuntu0.1+esm6, 1:4.1.7-4ubuntu0.1+esm7, 1:4.1.7-4ubuntu0.1~esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-93561
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:32 UTC · Revision 1
Source evidence
A flaw was found in io.netty/netty-codec-memcache. The Memcache binary protocol codec incorrectly reads `keyLength` and `extrasLength` as signed Java types instead of unsigned, as specified by the protocol. A malicious Memcache server can exploit this type mismatch by sending a specially crafted response. This can lead to frame desynchronization and response smuggling, where one client's data may be inadvertently exposed to another client's response stream in proxy or cache environments.
osv:UBUNTU-CVE-2026-93561
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
Complete source record
{
"id": "4dd75492f7f713ee4ba7fe06711d6a2318822b827359d7e7bff3c399b0673150",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-93561",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-93561",
"summary": "A flaw was found in io.netty/netty-codec-memcache. The Memcache binary protocol codec incorrectly reads `keyLength` and `extrasLength` as signed Java types instead of unsigned, as specified by the protocol. A malicious Memcache server can exploit this type mismatch by sending a specially crafted response. This can lead to frame desynchronization and response smuggling, where one client's data may be inadvertently exposed to another client's response stream in proxy or cache environments.",
"evidence": "osv:UBUNTU-CVE-2026-93561",
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/2/versions"
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{
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{
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},
{
"name": {
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},
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"affected_versions": [
{
"value": "1:4.1.33-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.33-2",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.33-3",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1ubuntu0.1~esm2",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1ubuntu0.1~esm3",
"evidence": "/affected/3/versions"
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{
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{
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"evidence": "/affected/3/versions"
},
{
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]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
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{
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},
{
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},
{
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},
{
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{
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{
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{
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},
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{
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{
"value": "1:4.1.48-9",
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{
"value": "1:4.1.48-9ubuntu0.1~esm1",
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{
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{
"value": "1:4.1.48-9ubuntu0.1",
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{
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},
{
"value": "1:4.1.48-9ubuntu0.1+esm3",
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{
"value": "1:4.1.48-9ubuntu0.2",
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{
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},
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},
{
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{
"value": "1:4.1.48-11",
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{
"value": "1:4.1.48-12",
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},
{
"value": "1:4.1.48-13",
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{
"value": "1:4.1.48-14",
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},
{
"value": "1:4.1.48-16",
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{
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],
"severity": "medium",
"structured": {
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"aliases": [
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],
"metrics": [
{
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"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
},
{
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}
],
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},
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],
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},
"ecosystem_specific": {
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{
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},
{
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},
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},
{
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],
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},
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"1:4.1.48-11",
"1:4.1.48-12",
"1:4.1.48-13",
"1:4.1.48-14",
"1:4.1.48-16",
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],
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},
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},
{
"binary_name": "libnetty-common-java",
"binary_version": "1:4.1.48-16ubuntu0.1~esm2"
},
{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.48-16ubuntu0.1~esm2"
}
]
}
}
],
"modified": "2026-10-17T13:01:18.137722890Z",
"provider": "osv",
"upstream": [
"CVE-2026-93561"
],
"references": [
"https://ubuntu.com/security/CVE-2026-93561",
"https://www.cve.org/CVERecord?id=CVE-2026-93561",
"https://bugzilla.redhat.com/show_bug.cgi?id=2536949",
"https://github.com/netty/netty/security/advisories/GHSA-wxrh-4rgq-pjcg",
"https://access.redhat.com/security/cve/CVE-2026-93561"
]
},
"related_cves": [
{
"value": "CVE-2026-93561",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361557,
"published_at": "2026-09-18T11:17:00+00:00"
}