CVE-2026-34042

HIGHNVD 8.28.2
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.5% (40th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2026-17286 (ENISA EUVD)Source: ENISA EUVD

8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

act is a project which allows for local running of github actions. Prior to version 0.2.86, act's built in actions/cache server listens to connections on all interfaces and allows anyone who can connect to it including someone anywhere on the internet to create caches with arbitrary keys and retrieve all existing caches. If they can predict which cache keys will be used by local actions, they can create malicious caches containing whatever files they please most likely allowing arbitrary remote code execution within the docker container. This issue has been patched in version 0.2.86.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
37
EG Risk 37/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity82% × 45%
Impact severity (EG Severity): CVSS 8.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.2): severity, escalated by confirmed exploitation. This CVE's 8.2 is its impact severity (EG Severity), not escalated.

EG Severity
8.2 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 31, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Jun 10, 2026
Patch available. Sources: github_release, github, github_commit.
GitHub advisoryMentions a patch (unverified)

remote code execution possible -- actions/cache server allows malicious cache injection · Advisory · nektos/act · GitHub

https://github.com/nektos/act/security/advisories/GHSA-x34h-54cw-9825
GitHub release Patch Available

v0.2.86

Patch available: nektos/act v0.2.86

https://github.com/nektos/act/releases/tag/v0.2.86
GitHub commit

commit c28c27e141e8 (nektos/act)

Fix landed in nektos/act commit c28c27e141e8 — awaiting tagged release

https://github.com/nektos/act/commit/c28c27e141e8b54f9853de82f421ee09846751f7

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/nektos/act—
  • every version up to 0.2.86: fixed in 0.2.86
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 37× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 212 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 114 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  5. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-10-25 14:34 UTCEG score recompute
  7. 2026-10-24 23:07 UTCEG score recompute
  8. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  9. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  10. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  11. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  12. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  13. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  14. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  15. 2026-10-18 03:46 UTCEG score recompute
  16. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  17. 2026-10-17 15:40 UTCEG score recompute
  18. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  19. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  20. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  21. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  22. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  23. 2026-10-12 16:13 UTCEG score recompute
  24. 2026-10-11 19:55 UTCEG score recompute
  25. 2026-10-11 17:08 UTCEG score recompute
Show 73 more
  1. 2026-10-11 14:35 UTCEG score recompute
  2. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  3. 2026-10-11 03:31 UTCOSV refresh
  4. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  5. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  6. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  7. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  8. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  9. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  11. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  12. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  13. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  14. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  15. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  16. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  17. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  18. 2026-09-21 15:19 UTCOSV refresh
  19. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  22. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  25. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  26. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  27. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  28. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  29. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  30. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  31. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  32. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  33. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  34. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  35. 2026-09-02 12:44 UTCOSV refresh
  36. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  37. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  38. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  39. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  40. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  41. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  42. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  43. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  44. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  45. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  46. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  47. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  48. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  49. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  50. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  51. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  52. 2026-08-16 09:42 UTCEG score recompute
  53. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  54. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  55. 2026-08-14 06:06 UTCEG score recompute
  56. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  57. 2026-08-12 20:26 UTCEG score recompute
  58. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  59. 2026-08-11 20:38 UTCEG score recompute
  60. 2026-08-11 03:39 UTCEG score recompute
  61. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  62. 2026-08-09 17:59 UTCEG score recompute
  63. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  64. 2026-08-09 05:41 UTCEG score recompute
  65. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  66. 2026-08-08 04:05 UTCEG score recompute
  67. 2026-08-06 18:14 UTCEG score recompute
  68. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  69. 2026-08-06 00:38 UTCEG score recompute
  70. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  71. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  72. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  73. 2026-08-03 22:58 UTCEG score recompute

Related CVEs(same product + same CWE)

Same product

2 shown

Go:github.com/nektos/act

Frequently asked(5)

What is CVE-2026-34042?
CVE-2026-34042 is a high-severity vulnerability; its CVE record was published on March 31, 2026. act is a project which allows for local running of github actions. Prior to version 0.2.86, act's built in actions/cache server listens to connections on all interfaces and allows anyone who can connect to it including someone anywhere on the internet to create caches with arbitrary keys and…
When was the CVE record for CVE-2026-34042 published?
The CVE record for CVE-2026-34042 was published on March 31, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-34042 actively exploited?
CVE-2026-34042 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-34042?
CVE-2026-34042 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-34042?
A fix for CVE-2026-34042 is available: update to the fixed version the vendor names in its advisory.

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