CVE-2026-12478

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

Score 4.8 from GitHub Security Advisory published 2026-07-14. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: None knownExposed: 0

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

The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0.

CVSS v3
4.8
EG Score
4.8(medium)
EG Risk
22(Track)
EG Risk 22/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity48% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 14, 2026
Patch available. Sources: redhat.
generic

websocket: Fix out-of-bounds read when reading unmasked frame (!518) · Merge requests · GNOME / libsoup · GitLab

https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/518
redhat

2489655 – (CVE-2026-12478) CVE-2026-12478 libsoup: Incomplete fix for CVE-2026-0716: Out-of-bounds read in libsoup WebSocket frame processing (unmasked path)

https://bugzilla.redhat.com/show_bug.cgi?id=2489655
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/cve-2026-0716
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-12478

Vendor Advisories for CVE-2026-12478(1)

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

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libsoup33.6.5-3 ... 3.6.6-1 (8 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 82× 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 118 total refreshes for this CVE.

  1. 2026-08-30 05:25 UTCEG score recompute
  2. 2026-08-30 05:25 UTCGHSA enrichment
  3. 2026-08-30 01:21 UTCEPSS rescore
  4. 2026-08-28 21:40 UTCEPSS rescore
  5. 2026-08-27 23:54 UTCEG score recompute
  6. 2026-08-27 23:54 UTCGHSA enrichment
  7. 2026-08-27 14:24 UTCEPSS rescore
  8. 2026-08-27 00:44 UTCEG score recompute
  9. 2026-08-27 00:44 UTCGHSA enrichment
  10. 2026-08-26 01:53 UTCEG score recompute
  11. 2026-08-26 01:53 UTCGHSA enrichment
  12. 2026-08-25 13:48 UTCEPSS rescore
  13. 2026-08-25 02:39 UTCEG score recompute
  14. 2026-08-25 02:38 UTCGHSA enrichment
  15. 2026-08-24 03:48 UTCGHSA enrichment
  16. 2026-08-23 04:37 UTCEG score recompute
  17. 2026-08-23 04:37 UTCGHSA enrichment
  18. 2026-08-23 00:19 UTCEPSS rescore
  19. 2026-08-22 05:47 UTCEG score recompute
  20. 2026-08-22 05:47 UTCGHSA enrichment
  21. 2026-08-21 23:48 UTCEPSS rescore
  22. 2026-08-21 06:57 UTCEG score recompute
  23. 2026-08-21 06:57 UTCGHSA enrichment
  24. 2026-08-20 22:55 UTCEPSS rescore
  25. 2026-08-20 08:06 UTCEG score recompute
Show 75 more
  1. 2026-08-20 08:06 UTCGHSA enrichment
  2. 2026-08-19 17:03 UTCEPSS rescore
  3. 2026-08-19 09:16 UTCEG score recompute
  4. 2026-08-19 09:16 UTCGHSA enrichment
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-18 10:27 UTCEG score recompute
  7. 2026-08-18 10:27 UTCGHSA enrichment
  8. 2026-08-17 10:09 UTCEG score recompute
  9. 2026-08-17 10:09 UTCGHSA enrichment
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 11:19 UTCEG score recompute
  12. 2026-08-16 11:19 UTCGHSA enrichment
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 12:30 UTCEG score recompute
  15. 2026-08-15 12:30 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 13:39 UTCEG score recompute
  18. 2026-08-14 13:39 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 14:49 UTCEG score recompute
  21. 2026-08-13 14:49 UTCGHSA enrichment
  22. 2026-08-12 16:00 UTCEG score recompute
  23. 2026-08-12 16:00 UTCGHSA enrichment
  24. 2026-08-12 13:50 UTCEPSS rescore
  25. 2026-08-11 17:10 UTCEG score recompute
  26. 2026-08-11 17:10 UTCGHSA enrichment
  27. 2026-08-11 13:42 UTCEPSS rescore
  28. 2026-08-10 23:59 UTCEPSS rescore
  29. 2026-08-10 18:20 UTCGHSA enrichment
  30. 2026-08-09 19:30 UTCEG score recompute
  31. 2026-08-09 19:30 UTCGHSA enrichment
  32. 2026-08-09 13:46 UTCEPSS rescore
  33. 2026-08-08 20:41 UTCEG score recompute
  34. 2026-08-08 20:41 UTCGHSA enrichment
  35. 2026-08-08 16:37 UTCEPSS rescore
  36. 2026-08-07 21:51 UTCEG score recompute
  37. 2026-08-07 21:51 UTCGHSA enrichment
  38. 2026-08-06 23:02 UTCEG score recompute
  39. 2026-08-06 23:01 UTCGHSA enrichment
  40. 2026-08-06 13:46 UTCEPSS rescore
  41. 2026-08-06 00:11 UTCEG score recompute
  42. 2026-08-06 00:11 UTCGHSA enrichment
  43. 2026-08-05 19:17 UTCEPSS rescore
  44. 2026-08-05 01:22 UTCEG score recompute
  45. 2026-08-05 01:22 UTCGHSA enrichment
  46. 2026-08-04 15:09 UTCEPSS rescore
  47. 2026-08-04 10:38 UTCEPSS rescore
  48. 2026-08-04 02:28 UTCEG score recompute
  49. 2026-08-04 02:28 UTCGHSA enrichment
  50. 2026-08-03 10:35 UTCEPSS rescore
  51. 2026-08-03 03:38 UTCGHSA enrichment
  52. 2026-08-02 04:47 UTCEG score recompute
  53. 2026-08-02 04:47 UTCGHSA enrichment
  54. 2026-08-02 02:26 UTCEPSS rescore
  55. 2026-08-01 05:57 UTCEG score recompute
  56. 2026-08-01 05:56 UTCGHSA enrichment
  57. 2026-08-01 04:15 UTCEPSS rescore
  58. 2026-07-31 07:03 UTCEG score recompute
  59. 2026-07-31 07:03 UTCGHSA enrichment
  60. 2026-07-30 16:27 UTCEPSS rescore
  61. 2026-07-30 08:13 UTCEG score recompute
  62. 2026-07-30 08:13 UTCGHSA enrichment
  63. 2026-07-30 01:30 UTCEPSS rescore
  64. 2026-07-29 08:25 UTCEG score recompute
  65. 2026-07-29 08:24 UTCGHSA enrichment
  66. 2026-07-28 15:36 UTCEPSS rescore
  67. 2026-07-28 09:31 UTCEG score recompute
  68. 2026-07-28 09:31 UTCGHSA enrichment
  69. 2026-07-27 14:13 UTCEPSS rescore
  70. 2026-07-27 10:40 UTCEG score recompute
  71. 2026-07-27 10:39 UTCGHSA enrichment
  72. 2026-07-26 14:54 UTCEPSS rescore
  73. 2026-07-26 14:54 UTCEPSS rescore
  74. 2026-07-26 11:49 UTCEG score recompute
  75. 2026-07-26 11:49 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12478?
CVE-2026-12478 is a medium vulnerability published on July 14, 2026. The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64MAX to trigger an OOB read…
When was CVE-2026-12478 disclosed?
CVE-2026-12478 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12478 actively exploited?
CVE-2026-12478 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.9% of all scored CVEs.
What is the CVSS score of CVE-2026-12478?
CVE-2026-12478 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-12478?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12478, 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.

Dependency Blast Radius

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