Critical
lighttpd — security advisory
lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks. Successful exploitation may allow an attacker to: * Bypass access control rules * Inject unsafe input into backend logic that trusts request headers * Execute HTTP Request Smuggling attacks under some conditions This issue affects lighttpd1.4.80
- Products
- lighttpd
- Affected versions
- 1.4.31-3ubuntu3, 1.4.33-1+nmu2ubuntu1, 1.4.33-1+nmu2ubuntu2, 1.4.33-1+nmu2ubuntu2.1, 1.4.33-1+nmu2ubuntu2.1+esm1, 1.4.33-1ubuntu1, 1.4.35-4ubuntu1, 1.4.35-4ubuntu2, 1.4.35-4ubuntu2.1, 1.4.35-4ubuntu2.1+esm1, 1.4.45-1ubuntu1, 1.4.45-1ubuntu3, 1.4.45-1ubuntu3+esm1, 1.4.45-1ubuntu3.18.04, 1.4.45-1ubuntu3.18.04+esm1, 1.4.45-1ubuntu3.18.04.1, 1.4.45-1ubuntu3.18.04.1+esm1, 1.4.53-4ubuntu2, 1.4.54-2ubuntu1, 1.4.55-1ubuntu1, 1.4.55-1ubuntu1.20.04.1, 1.4.55-1ubuntu1.20.04.2, 1.4.59-1ubuntu2, 1.4.59-1ubuntu3, 1.4.63-1ubuntu1, 1.4.63-1ubuntu2, 1.4.63-1ubuntu3, 1.4.63-1ubuntu3.1, 1.4.69-1ubuntu1, 1.4.69-1ubuntu2, 1.4.73-1ubuntu1, 1.4.73-1ubuntu2, 1.4.74-1ubuntu2, 1.4.74-1ubuntu3, 1.4.79-1ubuntu1, 1.4.79-2ubuntu1, 1.4.82-2ubuntu1, 1.4.82-2ubuntu2, 1.4.84-1ubuntu3, 1.4.85-1ubuntu2
- Fixed versions
- Not specified
- CVEs
- CVE-2025-12642
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:30 UTC · Revision 1
Source evidence
lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks. Successful exploitation may allow an attacker to: * Bypass access control rules * Inject unsafe input into backend logic that trusts request headers * Execute HTTP Request Smuggling attacks under some conditions This issue affects lighttpd1.4.80
osv:UBUNTU-CVE-2025-12642
lighttpd
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
Complete source record
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},
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}
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},
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],
"modified": "2026-10-17T12:57:00.631586540Z",
"provider": "osv",
"upstream": [
"CVE-2025-12642"
],
"references": [
"https://ubuntu.com/security/CVE-2025-12642",
"https://www.cve.org/CVERecord?id=CVE-2025-12642",
"https://github.com/lighttpd/lighttpd1.4/commit/35cb89c103877de62d6b63d0804255475d77e5e1"
]
},
"related_cves": [
{
"value": "CVE-2025-12642",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 356627,
"published_at": "2025-11-03T20:17:00+00:00"
}