CVE-2026-78991

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-08-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

Race condition in WebProtect in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to obtain sensitive information via a crafted HTML page. (Chromium security severity: Medium)

CVSS v3
5.3
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
5.3(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 27, 2026

Advisory Details (2)

Auto-updated Aug 26, 2026
No patch confirmed yet.
generic

Chromium

https://issues.chromium.org/issues/502888857
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-2026-78991(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 25× in last 7d / 90× 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 19:40 UTCEG score recompute
  2. 2026-09-19 19:40 UTCVendor advisory
  3. 2026-09-19 19:40 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 17:51 UTCEG score recompute
  6. 2026-09-18 17:51 UTCVendor advisory
  7. 2026-09-18 17:51 UTCGHSA enrichment
  8. 2026-09-17 16:02 UTCVendor advisory
  9. 2026-09-17 16:02 UTCGHSA enrichment
  10. 2026-09-16 14:13 UTCEG score recompute
  11. 2026-09-16 14:13 UTCVendor advisory
  12. 2026-09-16 14:13 UTCGHSA enrichment
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 12:01 UTCEG score recompute
  16. 2026-09-15 12:01 UTCVendor advisory
  17. 2026-09-15 12:01 UTCGHSA enrichment
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-14 10:12 UTCEG score recompute
  21. 2026-09-14 10:12 UTCVendor advisory
  22. 2026-09-14 10:12 UTCGHSA enrichment
  23. 2026-09-13 08:23 UTCEG score recompute
  24. 2026-09-13 08:23 UTCVendor advisory
  25. 2026-09-13 08:23 UTCGHSA enrichment
Show 65 more
  1. 2026-09-12 06:35 UTCEG score recompute
  2. 2026-09-12 06:35 UTCVendor advisory
  3. 2026-09-12 06:35 UTCGHSA enrichment
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 04:46 UTCEG score recompute
  7. 2026-09-11 04:46 UTCGHSA enrichment
  8. 2026-09-10 02:57 UTCGHSA enrichment
  9. 2026-09-09 01:08 UTCEG score recompute
  10. 2026-09-09 01:08 UTCVendor advisory
  11. 2026-09-09 01:08 UTCGHSA enrichment
  12. 2026-09-08 22:01 UTCEPSS rescore
  13. 2026-09-07 16:43 UTCVendor advisory
  14. 2026-09-07 16:43 UTCGHSA enrichment
  15. 2026-09-06 14:54 UTCEG score recompute
  16. 2026-09-06 14:54 UTCVendor advisory
  17. 2026-09-06 14:54 UTCGHSA enrichment
  18. 2026-09-06 13:48 UTCEPSS rescore
  19. 2026-09-05 13:04 UTCEG score recompute
  20. 2026-09-05 13:04 UTCVendor advisory
  21. 2026-09-05 13:04 UTCGHSA enrichment
  22. 2026-09-04 11:15 UTCEG score recompute
  23. 2026-09-04 11:15 UTCVendor advisory
  24. 2026-09-04 11:15 UTCGHSA enrichment
  25. 2026-09-04 05:07 UTCEPSS rescore
  26. 2026-09-03 09:26 UTCEG score recompute
  27. 2026-09-03 09:26 UTCVendor advisory
  28. 2026-09-03 09:26 UTCGHSA enrichment
  29. 2026-09-02 14:12 UTCEPSS rescore
  30. 2026-09-02 07:37 UTCEG score recompute
  31. 2026-09-02 07:37 UTCVendor advisory
  32. 2026-09-02 07:37 UTCGHSA enrichment
  33. 2026-09-01 13:54 UTCEPSS rescore
  34. 2026-09-01 05:48 UTCEG score recompute
  35. 2026-09-01 05:48 UTCVendor advisory
  36. 2026-09-01 05:47 UTCGHSA enrichment
  37. 2026-09-01 04:40 UTCEPSS rescore
  38. 2026-09-01 04:40 UTCEPSS rescore
  39. 2026-08-31 03:47 UTCEG score recompute
  40. 2026-08-31 03:47 UTCVendor advisory
  41. 2026-08-31 03:47 UTCGHSA enrichment
  42. 2026-08-30 19:18 UTCEPSS rescore
  43. 2026-08-30 19:17 UTCEPSS rescore
  44. 2026-08-30 01:58 UTCEG score recompute
  45. 2026-08-30 01:58 UTCVendor advisory
  46. 2026-08-30 01:58 UTCGHSA enrichment
  47. 2026-08-30 01:22 UTCEPSS rescore
  48. 2026-08-29 00:09 UTCEG score recompute
  49. 2026-08-29 00:09 UTCVendor advisory
  50. 2026-08-29 00:09 UTCGHSA enrichment
  51. 2026-08-28 21:42 UTCEPSS rescore
  52. 2026-08-27 18:04 UTCEG score recompute
  53. 2026-08-27 18:04 UTCGHSA enrichment
  54. 2026-08-27 14:25 UTCEPSS rescore
  55. 2026-08-26 20:37 UTCGHSA enrichment
  56. 2026-08-26 19:29 UTCEG score recompute▼ 1.20
  57. 2026-08-26 19:29 UTCGHSA enrichment
  58. 2026-08-26 19:26 UTCMITRE cvelistV5CVSS v3 → 5.3 · severity → MEDIUM
  59. 2026-08-26 16:41 UTCEG score recompute
  60. 2026-08-26 16:41 UTCGHSA enrichment
  61. 2026-08-26 14:47 UTCEPSS rescore
  62. 2026-08-25 21:32 UTCGHSA enrichment
  63. 2026-08-25 21:26 UTCNVD update
  64. 2026-08-25 20:31 UTCEG score recompute
  65. 2026-08-25 20:25 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-78991?
CVE-2026-78991 is a medium vulnerability published on August 25, 2026. Race condition in WebProtect in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to obtain sensitive information via a crafted HTML page. (Chromium security severity: Medium)
When was CVE-2026-78991 disclosed?
CVE-2026-78991 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78991 actively exploited?
CVE-2026-78991 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 75.6% of all scored CVEs.
What is the CVSS score of CVE-2026-78991?
CVE-2026-78991 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-78991?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78991, 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-2026-78991

Explore →

Is Your Infrastructure Affected by CVE-2026-78991?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs