CVE-2026-76844

HIGHPre-NVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-08-24. A secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.4Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

zlib 1.2.11 through 1.3.2 contains a heap buffer overflow: after an underlying write() fails, gz_write() returns without resetting strm.next_in, leaving it pointed at the caller's buffer. A later gz* write call then derives a position from the stale pointer and writes past a heap allocation; any write() failure reaches it, including EPIPE on a blocking descriptor, and in versions before 1.3.1.2 the failed write must be followed by a gzclearerr() call.

CVSS v3
7.4
EG Score
7.4HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity74% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 24, 2026

Last Modified

October 1, 2026

Advisory Details (4)

Auto-updated Aug 24, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

webpack-dev-middleware Path Traversal via Offset Slice on a Non-Slash-Terminated publicPath | Advisories | VulnCheck

https://www.vulncheck.com/advisories/webpack-dev-middleware-path-traversal-via-offset-slice-on-a-non-slash-terminated-publicpath
githubMentions a patch (unverified)🟡 PoC Available

Path traversal in webpack-dev-middleware · CVE-2024-29180 · GitHub Advisory Database · GitHub

https://github.com/advisories/GHSA-wr3j-pwj9-hqq6
generic

webpack-dev-middleware/src/middleware.js at v8.1.1 · webpack/webpack-dev-middleware · GitHub

https://github.com/webpack/webpack-dev-middleware/blob/v8.1.1/src/middleware.js
generic

GitHub - webpack/webpack-dev-middleware: A development middleware for webpack · GitHub

https://github.com/webpack/webpack-dev-middleware

Vendor Advisories for CVE-2026-76844(5)

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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatredhat-datagrid-maven-repository.zip2026-09-21redhat
redhatrhmtc/openshift-migration-ui-rhel8:17895463732026-09-17redhat
redhatdiscovery/discovery-ui-rhel9:17882061962026-08-31redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
webpack-dev-middleware—
  • 8.0.0 up to 8.3.0: fixed in 8.3.0
  • every version up to 7.4.6: fixed in 7.4.6
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 139× 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 221 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Same product

1 shown

npm:webpack-dev-middleware

Frequently asked(5)

What is CVE-2026-76844?
CVE-2026-76844 is a high vulnerability published on August 24, 2026. zlib 1.2.11 through 1.3.2 contains a heap buffer overflow: after an underlying write() fails, gzwrite() returns without resetting strm.nextin, leaving it pointed at the caller's buffer. A later gz* write call then derives a position from the stale pointer and writes past a heap allocation; any…
When was CVE-2026-76844 disclosed?
CVE-2026-76844 was first published on August 24, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76844 actively exploited?
CVE-2026-76844 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-76844?
CVE-2026-76844 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-76844?
A fix for CVE-2026-76844 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-76844 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-76844

Explore →

Is Your Infrastructure Affected by CVE-2026-76844?

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

Book a Demo →Browse All CVEs