CVE-2026-76988

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 weakness has been identified in liftoff-sr CIPster 1802525be27d33e19a9a83c163e331a1d13b1892. This affects the function CipConnMgrClass::forward_open of the file cipconnectionmanager.cc of the component ForwardOpen Handler. Executing a manipulation of the argument product_code_ can lead to out-of-bounds read. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. This patch is called ea870a274bf68dfaa3f511f20e2fff6778fb7b74. A patch should be applied to remediate this issue.

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 24, 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 ea870a274bf6 (liftoff-sr/CIPster)

Fix landed in liftoff-sr/CIPster commit ea870a274bf6 — awaiting tagged release

https://github.com/liftoff-sr/CIPster/commit/ea870a274bf68dfaa3f511f20e2fff6778fb7b74
generic

ForwardOpen mixed-class application path causes type confusion in `ConnectionData::CorrectSizes()` and triggers remote `out-of-bounds read` · Issue #45 · liftoff-sr/CIPster · GitHub

https://github.com/liftoff-sr/CIPster/issues/45

Vendor Advisories for CVE-2026-76988(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 16× in last 7d / 74× 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 127 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-76988?
CVE-2026-76988 is a medium vulnerability published on August 20, 2026. A weakness has been identified in liftoff-sr CIPster 1802525be27d33e19a9a83c163e331a1d13b1892. This affects the function CipConnMgrClass::forwardopen of the file cipconnectionmanager.cc of the component ForwardOpen Handler. Executing a manipulation of the argument productcode_ can lead to…
When was CVE-2026-76988 disclosed?
CVE-2026-76988 was first published on August 20, 2026, with the most recent update on August 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76988 actively exploited?
CVE-2026-76988 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-2026-76988?
CVE-2026-76988 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-2026-76988?
An upstream fix for CVE-2026-76988 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-2026-76988 are linked in the Vendor Advisories panel on this page.

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