CVE-2026-55738

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-17. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A stack-based buffer overflow exists in the raw_to_header function in src/microtar.c in rxi microtar 0.1.0. The function copies the 100-byte name and linkname fields of a TAR header with strcpy without guaranteeing null termination of the source.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

June 17, 2026

Last Modified

August 10, 2026

Advisory Details (3)

Auto-updated Jun 18, 2026
No patch confirmed yet.
generic
https://raw.githubusercontent.com/rxi/microtar/master/src/microtar.c
generic

microtar/src/microtar.c at master · rxi/microtar · GitHub

https://github.com/rxi/microtar/blob/master/src/microtar.c#L111
generic

GitHub - rxi/microtar: A lightweight tar library written in ANSI C · GitHub

https://github.com/rxi/microtar

Vendor Advisories for CVE-2026-55738(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 / 105× 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 225 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55738?
CVE-2026-55738 is a high vulnerability published on June 17, 2026. A stack-based buffer overflow exists in the rawtoheader function in src/microtar.c in rxi microtar 0.1.0. The function copies the 100-byte name and linkname fields of a TAR header with strcpy without guaranteeing null termination of the source.
When was CVE-2026-55738 disclosed?
CVE-2026-55738 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55738 actively exploited?
CVE-2026-55738 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 67.3% of all scored CVEs.
What is the CVSS score of CVE-2026-55738?
CVE-2026-55738 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-55738?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55738, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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