CVE-2026-76989

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-08-20. A secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 5.3Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

A security vulnerability has been detected in liftoff-sr CIPster 1802525be27d33e19a9a83c163e331a1d13b1892. This impacts an unknown function of the file source/src/enet_encap/encap.cc of the component TCP Encapsulation Receive Path. The manipulation leads to out-of-bounds read. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The identifier of the patch is e8e9dba09bf56962807d3504b783ccdb6287f3e4. To fix this issue, it is recommended to deploy a patch.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
55
EG Risk 55/100CISA 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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

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

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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 20, 2026

Last Modified

August 25, 2026

Advisory Details (3)

Auto-updated Aug 20, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

GitHub - liftoff-sr/CIPster: Ethernet/IP (Common Industrial Protocol) stack in C++. This started as a C to C++ conversion of C based OpENer. · GitHub

https://github.com/liftoff-sr/CIPster/
github_commit

commit e8e9dba09bf5 (liftoff-sr/CIPster)

Fix landed in liftoff-sr/CIPster commit e8e9dba09bf5 — awaiting tagged release

https://github.com/liftoff-sr/CIPster/commit/e8e9dba09bf56962807d3504b783ccdb6287f3e4
generic

Oversized TCP encapsulation packet is drained but still reported as fully received, causing stale-buffer CPF reparse and a global out-of-bounds read in `BufReader::get16()` · Issue #46 · liftoff-sr/CIPster · GitHub

https://github.com/liftoff-sr/CIPster/issues/46

Vendor Advisories for CVE-2026-76989(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 76× 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 133 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-76989?
CVE-2026-76989 is a medium vulnerability published on August 20, 2026. A security vulnerability has been detected in liftoff-sr CIPster 1802525be27d33e19a9a83c163e331a1d13b1892. This impacts an unknown function of the file source/src/enet_encap/encap.cc of the component TCP Encapsulation Receive Path. The manipulation leads to out-of-bounds read. The attack can be…
When was CVE-2026-76989 disclosed?
CVE-2026-76989 was first published on August 20, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76989 actively exploited?
CVE-2026-76989 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-76989?
CVE-2026-76989 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-76989?
An upstream fix for CVE-2026-76989 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-76989 are linked in the Vendor Advisories panel on this page.

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