CVE-2026-78955

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

Observable discrepancy in PerformanceAPIs in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to potentially obtain cross-origin data via a crafted HTML page. (Chromium security severity: Medium)

CVSS v3
6.5
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
No patch confirmed yet.
generic

Chromium

https://issues.chromium.org/issues/514439436
generic

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html

Vendor Advisories for CVE-2026-78955(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
chromium113.0.5672.126-1 ... 152.0.7977.64-1 (412 versions)152.0.7977.75-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
chromium138.0.7204.183-1 ... 152.0.7977.75-1~deb12u1 (178 versions)152.0.7977.75-1~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
chromium138.0.7204.183-1 ... 152.0.7977.75-1~deb13u1 (180 versions)——

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 26× in last 7d / 93× 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.

  1. 2026-09-19 10:06 UTCEG score recompute
  2. 2026-09-19 10:06 UTCVendor advisory
  3. 2026-09-19 10:06 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 08:35 UTCEG score recompute
  6. 2026-09-18 08:35 UTCVendor advisory
  7. 2026-09-18 08:35 UTCGHSA enrichment
  8. 2026-09-17 07:45 UTCEG score recompute
  9. 2026-09-17 07:45 UTCVendor advisory
  10. 2026-09-17 07:45 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 06:58 UTCEG score recompute
  13. 2026-09-16 06:58 UTCVendor advisory
  14. 2026-09-16 06:58 UTCGHSA enrichment
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 06:11 UTCEG score recompute
  17. 2026-09-15 06:11 UTCVendor advisory
  18. 2026-09-15 06:11 UTCGHSA enrichment
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-14 05:23 UTCEG score recompute
  22. 2026-09-14 05:23 UTCVendor advisory
  23. 2026-09-14 05:23 UTCGHSA enrichment
  24. 2026-09-13 04:36 UTCEG score recompute
  25. 2026-09-13 04:36 UTCVendor advisory
Show 68 more
  1. 2026-09-13 04:36 UTCGHSA enrichment
  2. 2026-09-12 03:50 UTCEG score recompute
  3. 2026-09-12 03:50 UTCVendor advisory
  4. 2026-09-12 03:50 UTCGHSA enrichment
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 03:03 UTCEG score recompute
  8. 2026-09-11 03:03 UTCGHSA enrichment
  9. 2026-09-10 02:17 UTCGHSA enrichment
  10. 2026-09-09 01:30 UTCEG score recompute
  11. 2026-09-09 01:30 UTCVendor advisory
  12. 2026-09-09 01:29 UTCGHSA enrichment
  13. 2026-09-08 22:01 UTCEPSS rescore
  14. 2026-09-08 00:42 UTCEG score recompute
  15. 2026-09-08 00:42 UTCVendor advisory
  16. 2026-09-08 00:41 UTCGHSA enrichment
  17. 2026-09-06 23:55 UTCEG score recompute
  18. 2026-09-06 23:55 UTCVendor advisory
  19. 2026-09-06 23:55 UTCGHSA enrichment
  20. 2026-09-06 13:48 UTCEPSS rescore
  21. 2026-09-05 23:08 UTCEG score recompute
  22. 2026-09-05 23:08 UTCVendor advisory
  23. 2026-09-05 23:08 UTCGHSA enrichment
  24. 2026-09-04 22:20 UTCEG score recompute
  25. 2026-09-04 22:20 UTCVendor advisory
  26. 2026-09-04 22:20 UTCGHSA enrichment
  27. 2026-09-04 05:07 UTCEPSS rescore
  28. 2026-09-03 21:30 UTCVendor advisory
  29. 2026-09-03 21:30 UTCGHSA enrichment
  30. 2026-09-02 20:41 UTCEG score recompute
  31. 2026-09-02 20:41 UTCVendor advisory
  32. 2026-09-02 20:41 UTCGHSA enrichment
  33. 2026-09-02 14:12 UTCEPSS rescore
  34. 2026-09-01 19:48 UTCEG score recompute
  35. 2026-09-01 19:48 UTCVendor advisory
  36. 2026-09-01 19:48 UTCGHSA enrichment
  37. 2026-09-01 13:54 UTCEPSS rescore
  38. 2026-09-01 04:40 UTCEPSS rescore
  39. 2026-09-01 04:40 UTCEPSS rescore
  40. 2026-08-31 19:02 UTCVendor advisory
  41. 2026-08-31 19:02 UTCGHSA enrichment
  42. 2026-08-30 22:18 UTCEG score recompute
  43. 2026-08-30 22:18 UTCVendor advisory
  44. 2026-08-30 22:18 UTCGHSA enrichment
  45. 2026-08-30 19:18 UTCEPSS rescore
  46. 2026-08-30 19:17 UTCEPSS rescore
  47. 2026-08-30 01:22 UTCEPSS rescore
  48. 2026-08-29 21:31 UTCEG score recompute
  49. 2026-08-29 21:31 UTCVendor advisory
  50. 2026-08-29 21:31 UTCGHSA enrichment
  51. 2026-08-28 21:42 UTCEPSS rescore
  52. 2026-08-28 20:44 UTCVendor advisory
  53. 2026-08-28 20:44 UTCGHSA enrichment
  54. 2026-08-28 19:50 UTCEG score recompute
  55. 2026-08-28 19:50 UTCVendor advisory
  56. 2026-08-28 19:50 UTCGHSA enrichment
  57. 2026-08-28 19:36 UTCMITRE cvelistV5CVSS v3 → 6.5 · severity → MEDIUM
  58. 2026-08-28 18:54 UTCVendor advisory
  59. 2026-08-28 18:54 UTCGHSA enrichment
  60. 2026-08-27 18:07 UTCGHSA enrichment
  61. 2026-08-27 14:25 UTCEPSS rescore
  62. 2026-08-26 16:40 UTCEG score recompute
  63. 2026-08-26 16:40 UTCGHSA enrichment
  64. 2026-08-26 14:47 UTCEPSS rescore
  65. 2026-08-25 21:31 UTCGHSA enrichment
  66. 2026-08-25 21:25 UTCNVD update
  67. 2026-08-25 20:29 UTCEG score recompute
  68. 2026-08-25 20:25 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-78955?
CVE-2026-78955 is a medium vulnerability published on August 25, 2026. Observable discrepancy in PerformanceAPIs in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to potentially obtain cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
When was CVE-2026-78955 disclosed?
CVE-2026-78955 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78955 actively exploited?
CVE-2026-78955 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 62.3% of all scored CVEs.
What is the CVSS score of CVE-2026-78955?
CVE-2026-78955 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-78955?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78955, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-78955

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