HighFix available
php-guzzlehttp-psr7, php-nyholm-psr7 — security advisory
guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Affected versions are subject to improper header parsing. An attacker could sneak in a newline (\n) into both the header names and values. While the specification states that \r\n\r\n is used to terminate the header list, many servers in the wild will also accept \n\n. This is a follow-up to CVE-2022-24775 where the fix was incomplete. The issue has been patched in versions 1.9.1 and 2.4.5. There are no known workarounds for this vulnerability. Users are advised to upgrade.
- Products
- php-guzzlehttp-psr7, php-nyholm-psr7
- Affected versions
- Not specified
- Fixed versions
- 1.5.1-2, 2.4.5-1
- CVEs
- CVE-2023-29197
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 15:47 UTC · Revision 1
Source evidence
guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Affected versions are subject to improper header parsing. An attacker could sneak in a newline (\n) into both the header names and values. While the specification states that \r\n\r\n is used to terminate the header list, many servers in the wild will also accept \n\n. This is a follow-up to CVE-2022-24775 where the fix was incomplete. The issue has been patched in versions 1.9.1 and 2.4.5. There are no known workarounds for this vulnerability. Users are advised to upgrade.
osv:DEBIAN-CVE-2023-29197
php-guzzlehttp-psr7
Fixed versions: 2.4.5-1
php-guzzlehttp-psr7
Fixed versions: 2.4.5-1
php-guzzlehttp-psr7
Fixed versions: 2.4.5-1
php-nyholm-psr7
Fixed versions: 1.5.1-2
php-nyholm-psr7
Fixed versions: 1.5.1-2
php-nyholm-psr7
Fixed versions: 1.5.1-2
Complete source record
{
"id": "0b8eb62b96bb8a0a193b13d11e797ad4cbe868fa96d2ca46360f83c4189eca76",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2023-29197",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2023-29197",
"summary": "guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Affected versions are subject to improper header parsing. An attacker could sneak in a newline (\\n) into both the header names and values. While the specification states that \\r\\n\\r\\n is used to terminate the header list, many servers in the wild will also accept \\n\\n. This is a follow-up to CVE-2022-24775 where the fix was incomplete. The issue has been patched in versions 1.9.1 and 2.4.5. There are no known workarounds for this vulnerability. Users are advised to upgrade.",
"evidence": "osv:DEBIAN-CVE-2023-29197",
"products": [
{
"name": {
"value": "php-guzzlehttp-psr7",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.5-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "php-guzzlehttp-psr7",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.5-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "php-guzzlehttp-psr7",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.5-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "php-nyholm-psr7",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.5.1-2",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "php-nyholm-psr7",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.5.1-2",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "php-nyholm-psr7",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.5.1-2",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2023-29197",
"aliases": [
"DEBIAN-CVE-2023-29197"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.5-1"
}
]
}
],
"package": {
"name": "php-guzzlehttp-psr7",
"purl": "pkg:deb/debian/php-guzzlehttp-psr7?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-29197.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.5-1"
}
]
}
],
"package": {
"name": "php-guzzlehttp-psr7",
"purl": "pkg:deb/debian/php-guzzlehttp-psr7?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-29197.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "2.4.5-1"
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],
"package": {
"name": "php-guzzlehttp-psr7",
"purl": "pkg:deb/debian/php-guzzlehttp-psr7?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-29197.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "1.5.1-2"
}
]
}
],
"package": {
"name": "php-nyholm-psr7",
"purl": "pkg:deb/debian/php-nyholm-psr7?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-29197.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.1-2"
}
]
}
],
"package": {
"name": "php-nyholm-psr7",
"purl": "pkg:deb/debian/php-nyholm-psr7?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-29197.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.1-2"
}
]
}
],
"package": {
"name": "php-nyholm-psr7",
"purl": "pkg:deb/debian/php-nyholm-psr7?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-29197.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T18:01:48.510247942Z",
"provider": "osv",
"upstream": [
"CVE-2023-29197"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2023-29197"
]
},
"related_cves": [
{
"value": "CVE-2023-29197",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 455704,
"published_at": "2023-04-17T22:15:09.947+00:00"
}