CVE-2026-55079

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 53% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.24.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, NewDataBuilder in provisionersdk/proto/dataupload.go allocated a byte slice using the client-supplied FileSize from a DataUpload message without an upper-bound check. Although the DRPC wire limit is 4 MiB, the FileSize value itself was unconstrained. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 validates FileSize against an upper bound (MaxFileSize = 100 MiB) before allocation. As a workaround, restrict access to the provisioner daemon serve endpoint to trusted provisioner daemon service accounts.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
EPSS PROB
0.6%
EPSS %ILE
47th
KEV
Not listed

Published

July 6, 2026

Last Modified

July 8, 2026

Advisory Details (6)

Auto-updated Jul 8, 2026
Patch available. Sources: github_pr, github_release, github.
githubMentions a patch (unverified)

Unbounded memory allocation in provisioner file upload allows authenticated denial of service · Advisory · coder/coder · GitHub

https://github.com/coder/coder/security/advisories/GHSA-f962-qm93-mj4c
github_release Patch Available

v2.34.2 [SECURITY]

Patch available: coder/coder v2.34.2

https://github.com/coder/coder/releases/tag/v2.34.2
github_release Patch Available

v2.33.8 [SECURITY]

Patch available: coder/coder v2.33.8

https://github.com/coder/coder/releases/tag/v2.33.8
github_release Patch Available

v2.32.7 [SECURITY]

Patch available: coder/coder v2.32.7

https://github.com/coder/coder/releases/tag/v2.32.7
github_release Patch Available

v2.29.17 [SECURITY]

Patch available: coder/coder v2.29.17

https://github.com/coder/coder/releases/tag/v2.29.17
github_pr

fix: validate FileSize in NewDataBuilder to prevent OOM DoS

Fix merged in coder/coder PR #25710 on 2026-05-27 — awaiting tagged release

https://github.com/coder/coder/pull/25710

Vendor Advisories for CVE-2026-55079(1)

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

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFix by version rangeDependents
github.com/coder/coder—
  • every version on: no fix on record
—
github.com/coder/coder/v2—
  • 2.34.0 up to 2.34.2: fixed in 2.34.2
  • 2.33.0 up to 2.33.8: fixed in 2.33.8
  • 2.30.0 up to 2.32.7: fixed in 2.32.7
  • 2.24.0 up to 2.29.17: fixed in 2.29.17
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 30× 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 124 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
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  10. 2026-09-30 15:03 UTCEPSS rescore
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  13. 2026-09-28 13:41 UTCEG score recompute
  14. 2026-09-27 13:48 UTCEPSS rescore
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  18. 2026-09-23 06:22 UTCEG score recompute
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  25. 2026-09-14 11:24 UTCEG score recompute
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  1. 2026-09-13 16:47 UTCEPSS rescore
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  7. 2026-09-07 16:01 UTCEPSS rescore
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  10. 2026-09-04 05:06 UTCEPSS rescore
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  19. 2026-08-27 14:25 UTCEPSS rescore
  20. 2026-08-27 02:06 UTCEG score recompute
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  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-24 12:55 UTCEG score recompute
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  26. 2026-08-23 00:19 UTCEPSS rescore
  27. 2026-08-22 08:18 UTCEG score recompute
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  34. 2026-08-18 13:48 UTCEPSS rescore
  35. 2026-08-17 22:39 UTCEG score recompute
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  37. 2026-08-16 15:09 UTCEG score recompute
  38. 2026-08-16 14:56 UTCEPSS rescore
  39. 2026-08-16 02:14 UTCEPSS rescore
  40. 2026-08-15 12:51 UTCEG score recompute
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  43. 2026-08-13 22:00 UTCEPSS rescore
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  45. 2026-08-12 13:51 UTCEPSS rescore
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  66. 2026-07-28 18:06 UTCEG score recompute
  67. 2026-07-28 15:37 UTCEPSS rescore
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  71. 2026-07-25 14:18 UTCEPSS rescore
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  74. 2026-07-23 03:20 UTCEG score recompute
  75. 2026-07-22 14:08 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-55079?
CVE-2026-55079 is a medium vulnerability published on July 6, 2026. Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.24.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, NewDataBuilder in provisionersdk/proto/dataupload.go allocated a byte slice using the client-supplied FileSize from a…
When was CVE-2026-55079 disclosed?
CVE-2026-55079 was first published on July 6, 2026, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55079 actively exploited?
CVE-2026-55079 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55079?
CVE-2026-55079 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-55079?
A fix for CVE-2026-55079 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55079 are linked in the Vendor Advisories panel on this page.

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