MediumFix available
libsoup2.4, libsoup3 — security advisory
An algorithmic complexity flaw exists in libsoup's HTTP Range header processing that persists after the CVE-2025-32907 fix. CVE-2025-32907 addressed memory amplification when a client repeated the same range many times in a single Range header. Commit 9bb92f7a corrected merge correctness in soup_message_headers_get_ranges_internal() in libsoup/soup-message-headers.c, but the coalescing loop still removes merged ranges using g_array_remove_index() for each coalesced element. Because GArray is contiguous, each mid-array removal performs an O(N) memmove. When many identical satisfiable ranges are supplied (for example bytes=0-0 repeated thousands of times), the loop performs O(N²) work coalescing them into a single range. The vulnerable path is reachable server-side from handle_partial_get() in libsoup/server/http1/soup-server-message-io-http1.c when a SoupServer handler returns HTTP 200 with a non-empty body. No authentication is required. The number of ranges is bounded only by the maximum request header size (~100 KiB), allowing roughly 25,000 ranges per request. Reporter measurements on libsoup HEAD containing the CVE-2025-32907 fix show ~90 ms single-core CPU per such request at the wire maximum, blocking the server's event loop for that duration. This is a CPU exhaustion / availability issue only. No memory corruption or information disclosure occurs. Affected: libsoup versions containing the CVE-2025-32907 fix but not merge request !550. Fixed upstream: MR !550 merged 202
- 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, 2.60.1-1, 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, 2.68.2-0ubuntu1, 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, 2.72.0-3ubuntu3, 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, 2.74.3-1, 2.74.3-10.1ubuntu4, 2.74.3-10.1ubuntu5, 2.74.3-10.1ubuntu5+esm1, 2.74.3-10.1ubuntu5+esm2, 2.74.3-2, 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, 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, 3.4.2-4, 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, 3.6.5-4, 3.6.5-5, 3.6.5-6, 3.6.5-7, 3.6.5-9, 3.6.6-1
- Fixed versions
- 2.52.2-1ubuntu0.3+esm8, 2.62.1-1ubuntu0.4+esm9, 2.70.0-1ubuntu0.5+esm4, 2.74.2-3ubuntu0.9, 2.74.3-10.1ubuntu5+esm3, 2.74.3-6ubuntu1.9, 3.0.7-0ubuntu1+esm9, 3.4.4-5ubuntu0.9, 3.6.6-1ubuntu0.1, 3.6.6-1ubuntu3
- CVEs
- CVE-2026-77680
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 17:41 UTC · Revision 1
Source evidence
An algorithmic complexity flaw exists in libsoup's HTTP Range header processing that persists after the CVE-2025-32907 fix. CVE-2025-32907 addressed memory amplification when a client repeated the same range many times in a single Range header. Commit 9bb92f7a corrected merge correctness in soup_message_headers_get_ranges_internal() in libsoup/soup-message-headers.c, but the coalescing loop still removes merged ranges using g_array_remove_index() for each coalesced element. Because GArray is contiguous, each mid-array removal performs an O(N) memmove. When many identical satisfiable ranges are supplied (for example bytes=0-0 repeated thousands of times), the loop performs O(N²) work coalescing them into a single range. The vulnerable path is reachable server-side from handle_partial_get() in libsoup/server/http1/soup-server-message-io-http1.c when a SoupServer handler returns HTTP 200 with a non-empty body. No authentication is required. The number of ranges is bounded only by the maximum request header size (~100 KiB), allowing roughly 25,000 ranges per request. Reporter measurements on libsoup HEAD containing the CVE-2025-32907 fix show ~90 ms single-core CPU per such request at the wire maximum, blocking the server's event loop for that duration. This is a CPU exhaustion / availability issue only. No memory corruption or information disclosure occurs. Affected: libsoup versions containing the CVE-2025-32907 fix but not merge request !550. Fixed upstream: MR !550 merged 202
osv:UBUNTU-CVE-2026-77680
libsoup2.4
Fixed versions: 2.52.2-1ubuntu0.3+esm8
libsoup2.4
Fixed versions: 2.62.1-1ubuntu0.4+esm9
libsoup2.4
Fixed versions: 2.70.0-1ubuntu0.5+esm4
libsoup2.4
Fixed versions: 2.74.2-3ubuntu0.9
libsoup3
Fixed versions: 3.0.7-0ubuntu1+esm9
libsoup2.4
Fixed versions: 2.74.3-6ubuntu1.9
libsoup3
Fixed versions: 3.4.4-5ubuntu0.9
libsoup2.4
Fixed versions: Not specified
libsoup3
Fixed versions: 3.6.6-1ubuntu3
libsoup3
Fixed versions: 3.6.6-1ubuntu0.1
libsoup2.4
Fixed versions: 2.74.3-10.1ubuntu5+esm3
Complete source record
{
"id": "57e533153dda123987b56bd17bc06bdd93ebede410f9c925ec650c7971c767c0",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-77680",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-77680",
"summary": "An algorithmic complexity flaw exists in libsoup's HTTP Range header processing that persists after the CVE-2025-32907 fix. CVE-2025-32907 addressed memory amplification when a client repeated the same range many times in a single Range header. Commit 9bb92f7a corrected merge correctness in soup_message_headers_get_ranges_internal() in libsoup/soup-message-headers.c, but the coalescing loop still removes merged ranges using g_array_remove_index() for each coalesced element. Because GArray is contiguous, each mid-array removal performs an O(N) memmove. When many identical satisfiable ranges are supplied (for example bytes=0-0 repeated thousands of times), the loop performs O(N²) work coalescing them into a single range. The vulnerable path is reachable server-side from handle_partial_get() in libsoup/server/http1/soup-server-message-io-http1.c when a SoupServer handler returns HTTP 200 with a non-empty body. No authentication is required. The number of ranges is bounded only by the maximum request header size (~100 KiB), allowing roughly 25,000 ranges per request. Reporter measurements on libsoup HEAD containing the CVE-2025-32907 fix show ~90 ms single-core CPU per such request at the wire maximum, blocking the server's event loop for that duration. This is a CPU exhaustion / availability issue only. No memory corruption or information disclosure occurs. Affected: libsoup versions containing the CVE-2025-32907 fix but not merge request !550. Fixed upstream: MR !550 merged 202",
"evidence": "osv:UBUNTU-CVE-2026-77680",
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/2/versions"
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{
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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"evidence": "/affected/2/versions"
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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{
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"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
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{
"value": "2.74.2-3",
"evidence": "/affected/3/versions"
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"evidence": "/affected/3/versions"
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{
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{
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{
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"evidence": "/affected/3/versions"
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"evidence": "/affected/3/versions"
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{
"value": "2.74.2-3ubuntu0.6",
"evidence": "/affected/3/versions"
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{
"value": "2.74.2-3ubuntu0.7",
"evidence": "/affected/3/versions"
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{
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"affected_versions": [
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"evidence": "/affected/4/versions"
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{
"value": "3.0.4-3",
"evidence": "/affected/4/versions"
},
{
"value": "3.0.5-1",
"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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{
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{
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{
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{
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"evidence": "/affected/6/versions"
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{
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"evidence": "/affected/6/versions"
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{
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"evidence": "/affected/6/versions"
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{
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"evidence": "/affected/6/versions"
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{
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"evidence": "/affected/6/versions"
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{
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"evidence": "/affected/6/versions"
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{
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{
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{
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},
{
"name": {
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{
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],
"affected_versions": [
{
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"evidence": "/affected/8/versions"
}
]
},
{
"name": {
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"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.6-1ubuntu0.1",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": [
{
"value": "3.6.5-4",
"evidence": "/affected/9/versions"
},
{
"value": "3.6.5-5",
"evidence": "/affected/9/versions"
},
{
"value": "3.6.5-6",
"evidence": "/affected/9/versions"
},
{
"value": "3.6.5-7",
"evidence": "/affected/9/versions"
},
{
"value": "3.6.5-9",
"evidence": "/affected/9/versions"
},
{
"value": "3.6.6-1",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
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"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.74.3-10.1ubuntu5+esm3",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": [
{
"value": "2.74.3-10.1ubuntu4",
"evidence": "/affected/10/versions"
},
{
"value": "2.74.3-10.1ubuntu5",
"evidence": "/affected/10/versions"
},
{
"value": "2.74.3-10.1ubuntu5+esm1",
"evidence": "/affected/10/versions"
},
{
"value": "2.74.3-10.1ubuntu5+esm2",
"evidence": "/affected/10/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-77680",
"aliases": [
"UBUNTU-CVE-2026-77680"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "Ubuntu",
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],
"modified": "2026-10-22T04:41:54.400481641Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-77680",
"https://www.cve.org/CVERecord?id=CVE-2026-77680",
"https://gitlab.gnome.org/GNOME/libsoup/-/issues/538",
"https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/550",
"https://ubuntu.com/security/notices/USN-8890-1",
"https://ubuntu.com/security/notices/USN-8890-2"
]
},
"related_cves": [
{
"value": "CVE-2026-77680",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 404339,
"published_at": "2026-08-25T21:17:00+00:00"
}