CVE-2025-9901

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2025-09-03. NVD baseline CVSS 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
—
EPSS
35.1%
KEV
Not listed

Published

September 3, 2025

Last Modified

June 30, 2026

Advisory Details (3)

Auto-updated May 6, 2026
Patch available. Sources: redhat.
generic

(CVE-2025-9901) (#YWH-PGM9867-72) libsoup ignores Vary header in HTTP caching (#453) · Issues · GNOME / libsoup · GitLab

https://gitlab.gnome.org/GNOME/libsoup/-/issues/453
redhat

2392790 – (CVE-2025-9901) CVE-2025-9901 libsoup: Improper Handling of HTTP Vary Header in libsoup Caching

https://bugzilla.redhat.com/show_bug.cgi?id=2392790
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2025-9901

Vendor Advisories for CVE-2025-9901(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 02:28 UTCEPSS rescore
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  13. 2026-07-10 07:23 UTCOSV refresh
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  25. 2026-06-30 23:22 UTCEPSS rescore
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  1. 2026-06-29 14:06 UTCEPSS rescore
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  5. 2026-06-27 03:08 UTCEPSS rescore
  6. 2026-06-25 13:49 UTCEPSS rescore
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  9. 2026-06-22 14:25 UTCEPSS rescore
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  11. 2026-06-21 17:12 UTCOSV refresh
  12. 2026-06-21 14:56 UTCEPSS rescore
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  20. 2026-06-15 17:48 UTCEPSS rescore
  21. 2026-06-14 23:18 UTCEPSS rescore
  22. 2026-06-13 23:00 UTCEPSS rescore
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  24. 2026-06-12 23:12 UTCEPSS rescore
  25. 2026-06-11 14:00 UTCEPSS rescore
  26. 2026-06-10 22:18 UTCEPSS rescore
  27. 2026-06-10 13:22 UTCEPSS rescore
  28. 2026-06-08 14:17 UTCEPSS rescore
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  30. 2026-06-07 15:25 UTCEPSS rescore
  31. 2026-06-07 15:24 UTCEPSS rescore
  32. 2026-06-06 13:47 UTCEPSS rescore
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  35. 2026-06-05 22:47 UTCEPSS rescore
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  41. 2026-06-02 20:13 UTCEPSS rescore
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  43. 2026-06-02 17:02 UTCOSV refresh
  44. 2026-06-01 13:51 UTCEPSS rescore
  45. 2026-06-01 13:51 UTCEPSS rescore
  46. 2026-05-31 22:30 UTCEPSS rescore
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  48. 2026-05-31 00:16 UTCEPSS rescore
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  50. 2026-05-29 13:44 UTCEPSS rescore
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  65. 2026-05-24 16:58 UTCEPSS rescore
  66. 2026-05-22 21:16 UTCEPSS rescore
  67. 2026-05-22 21:16 UTCEPSS rescore
  68. 2026-05-21 22:43 UTCEPSS rescore
  69. 2026-05-21 08:48 UTCEG score recompute
  70. 2026-05-21 08:48 UTCGHSA enrichment
  71. 2026-05-20 22:37 UTCEPSS rescore
  72. 2026-05-20 22:37 UTCEPSS rescore
  73. 2026-05-20 22:37 UTCEPSS rescore
  74. 2026-05-20 11:21 UTCEPSS rescore
  75. 2026-05-20 11:21 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-9901?
CVE-2025-9901 is a medium vulnerability published on September 3, 2025. 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…
When was CVE-2025-9901 disclosed?
CVE-2025-9901 was first published in the National Vulnerability Database on September 3, 2025, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-9901 actively exploited?
CVE-2025-9901 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-9901?
CVE-2025-9901 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2025-9901?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-9901, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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