UBUNTU-CVE-2025-9901 (CVE-2025-9901)
Vulnerability from osv_ubuntu – Published: 2025-09-03 13:15 – Updated: 2026-09-17 22:16 – Source website
VLAI
Details
A flaw was found in libsoup’s caching mechanism, SoupCache, where the HTTP Vary header is ignored when evaluating cached responses. This header ensures that responses vary appropriately based on request headers such as language or authentication. Without this check, cached content can be incorrectly reused across different requests, potentially exposing sensitive user information. While the issue is unlikely to affect everyday desktop use, it could result in confidentiality breaches in proxy or multi-user environments.
Severity
5.9 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
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},
{
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}
],
"priority_reason": "Upstream has deemed this to be a low priority issue"
},
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},
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{
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{
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{
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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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{
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],
"priority_reason": "Upstream has deemed this to be a low priority issue"
},
"package": {
"ecosystem": "Ubuntu:Pro:26.04:LTS",
"name": "libsoup2.4",
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"2.74.3-10.1ubuntu5",
"2.74.3-10.1ubuntu5+esm1",
"2.74.3-10.1ubuntu5+esm2"
]
}
],
"aliases": [],
"details": "A flaw was found in libsoup\u2019s caching mechanism, SoupCache, where the HTTP Vary header is ignored when evaluating cached responses. This header ensures that responses vary appropriately based on request headers such as language or authentication. Without this check, cached content can be incorrectly reused across different requests, potentially exposing sensitive user information. While the issue is unlikely to affect everyday desktop use, it could result in confidentiality breaches in proxy or multi-user environments.",
"id": "UBUNTU-CVE-2025-9901",
"modified": "2026-09-17T22:16:41Z",
"published": "2025-09-03T13:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-9901"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-9901"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2025-9901"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2025-9901"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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