High
libsoup2.4, libsoup3 — security advisory
A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used as the size of the returned GBytes. This can lead to an out-of-bounds read or application crash when processing a crafted data URI.
- Products
- libsoup2.4, libsoup3
- Affected versions
- 2.50.0-2debian1, 2.52.1-1, 2.52.2-1, 2.52.2-1ubuntu0.1, 2.52.2-1ubuntu0.2, 2.52.2-1ubuntu0.3, 2.52.2-1ubuntu0.3+esm1, 2.52.2-1ubuntu0.3+esm2, 2.52.2-1ubuntu0.3+esm3, 2.52.2-1ubuntu0.3+esm4, 2.52.2-1ubuntu0.3+esm5, 2.52.2-1ubuntu0.3+esm6, 2.52.2-1ubuntu0.3+esm7, 2.52.2-1ubuntu0.3+esm8, 2.60.1-1, 2.60.2-1, 2.60.2-2, 2.60.3-1, 2.61.90-1, 2.62.0-1, 2.62.1-1, 2.62.1-1ubuntu0.1, 2.62.1-1ubuntu0.3, 2.62.1-1ubuntu0.4, 2.62.1-1ubuntu0.4+esm1, 2.62.1-1ubuntu0.4+esm2, 2.62.1-1ubuntu0.4+esm3, 2.62.1-1ubuntu0.4+esm4, 2.62.1-1ubuntu0.4+esm5, 2.62.1-1ubuntu0.4+esm6, 2.62.1-1ubuntu0.4+esm7, 2.62.1-1ubuntu0.4+esm8, 2.62.1-1ubuntu0.4+esm9, 2.68.2-0ubuntu1, 2.68.2-1, 2.68.2-2, 2.68.2-2build2, 2.69.90-1, 2.70.0-1, 2.70.0-1ubuntu0.1, 2.70.0-1ubuntu0.2, 2.70.0-1ubuntu0.3, 2.70.0-1ubuntu0.4, 2.70.0-1ubuntu0.5, 2.70.0-1ubuntu0.5+esm1, 2.70.0-1ubuntu0.5+esm2, 2.70.0-1ubuntu0.5+esm3, 2.70.0-1ubuntu0.5+esm4, 2.72.0-3ubuntu3, 2.74.1-1, 2.74.2-2, 2.74.2-3, 2.74.2-3ubuntu0.1, 2.74.2-3ubuntu0.2, 2.74.2-3ubuntu0.3, 2.74.2-3ubuntu0.4, 2.74.2-3ubuntu0.5, 2.74.2-3ubuntu0.6, 2.74.2-3ubuntu0.7, 2.74.2-3ubuntu0.8, 2.74.2-3ubuntu0.9, 2.74.3-1, 2.74.3-10.1ubuntu4, 2.74.3-10.1ubuntu5, 2.74.3-10.1ubuntu5+esm1, 2.74.3-10.1ubuntu5+esm2, 2.74.3-10.1ubuntu5+esm3, 2.74.3-2, 2.74.3-3, 2.74.3-6, 2.74.3-6build1, 2.74.3-6ubuntu1, 2.74.3-6ubuntu1.1, 2.74.3-6ubuntu1.2, 2.74.3-6ubuntu1.3, 2.74.3-6ubuntu1.4, 2.74.3-6ubuntu1.5, 2.74.3-6ubuntu1.6, 2.74.3-6ubuntu1.7, 2.74.3-6ubuntu1.8, 2.74.3-6ubuntu1.9, 3.0.4-2, 3.0.4-3, 3.0.5-1, 3.0.7-0ubuntu1, 3.0.7-0ubuntu1+esm1, 3.0.7-0ubuntu1+esm2, 3.0.7-0ubuntu1+esm3, 3.0.7-0ubuntu1+esm4, 3.0.7-0ubuntu1+esm5, 3.0.7-0ubuntu1+esm6, 3.0.7-0ubuntu1+esm7, 3.0.7-0ubuntu1+esm8, 3.0.7-0ubuntu1+esm9, 3.4.2-4, 3.4.4-1, 3.4.4-2, 3.4.4-4, 3.4.4-5, 3.4.4-5build1, 3.4.4-5build2, 3.4.4-5ubuntu0.1, 3.4.4-5ubuntu0.2, 3.4.4-5ubuntu0.3, 3.4.4-5ubuntu0.4, 3.4.4-5ubuntu0.5, 3.4.4-5ubuntu0.6, 3.4.4-5ubuntu0.7, 3.4.4-5ubuntu0.8, 3.4.4-5ubuntu0.9, 3.6.5-4, 3.6.5-5, 3.6.5-6, 3.6.5-7, 3.6.5-9, 3.6.6-1, 3.6.6-1ubuntu0.1, 3.6.6-1ubuntu3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-102555
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 17:40 UTC · Revision 1
Source evidence
A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used as the size of the returned GBytes. This can lead to an out-of-bounds read or application crash when processing a crafted data URI.
osv:UBUNTU-CVE-2026-102555
libsoup2.4
Fixed versions: Not specified
libsoup2.4
Fixed versions: Not specified
libsoup2.4
Fixed versions: Not specified
libsoup2.4
Fixed versions: Not specified
libsoup3
Fixed versions: Not specified
libsoup2.4
Fixed versions: Not specified
libsoup3
Fixed versions: Not specified
libsoup2.4
Fixed versions: Not specified
libsoup3
Fixed versions: Not specified
libsoup3
Fixed versions: Not specified
libsoup2.4
Fixed versions: Not specified
Complete source record
{
"id": "993c9bf6ab22aacd9fd44fb48fe45950415079b7a3c15b1cdfb0fcdb2328af4a",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-102555",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-102555",
"summary": "A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used as the size of the returned GBytes. This can lead to an out-of-bounds read or application crash when processing a crafted data URI.",
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{
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{
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{
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{
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}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-102555",
"aliases": [
"UBUNTU-CVE-2026-102555"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
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"2.52.2-1ubuntu0.3+esm2",
"2.52.2-1ubuntu0.3+esm3",
"2.52.2-1ubuntu0.3+esm4",
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"2.52.2-1ubuntu0.3+esm6",
"2.52.2-1ubuntu0.3+esm7",
"2.52.2-1ubuntu0.3+esm8"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102555.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "libsoup-gnome2.4-1",
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},
{
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}
]
}
},
{
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{
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}
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}
],
"package": {
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"purl": "pkg:deb/ubuntu/libsoup2.4?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
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"modified": "2026-10-22T04:30:59.467084316Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-102555",
"https://www.cve.org/CVERecord?id=CVE-2026-102555",
"https://bugzilla.redhat.com/show_bug.cgi?id=2543224",
"https://gitlab.gnome.org/GNOME/libsoup/-/work_items/554",
"https://access.redhat.com/security/cve/CVE-2026-102555"
]
},
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"value": "CVE-2026-102555",
"evidence": "/upstream"
}
],
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"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 404314,
"published_at": "2026-09-29T18:17:00+00:00"
}