CVE-2026-48693

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

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

Score 5.5 from GitHub Security Advisory published 2026-05-26. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-31899 (ENISA EUVD) · GHSA-f762-5mrw-32x8 (GitHub Security Advisories)Source: ENISA EUVD

5.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

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

The CVE record's description, written by its CNA (MITRE Corporation), states the affected versions: "FastNetMon Community Edition through 1.2.9 is vulnerable to a local symlink attack via predictable file paths in /tmp." No release containing a fix is confirmed on record.

FastNetMon Community Edition through 1.2.9 is vulnerable to a local symlink attack via predictable file paths in /tmp. The statistics file path defaults to '/tmp/fastnetmon.dat' (src/fastnetmon.cpp line 159). The print_screen_contents_into_file() function (src/fastnetmon_logic.cpp line 2186) opens this path with std::ios::trunc without checking for symlinks or using O_NOFOLLOW. Additionally, the chmod() call on line 2190 always operates on cli_stats_file_path regardless of which file_path parameter was passed (a bug that applies wrong permissions), and the umask is set to 0 during daemonization (src/fastnetmon.cpp line 1821), making all created files world-writable. A local attacker can exploit this to overwrite arbitrary files as the FastNetMon process user (typically root).

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

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)
Severity55% × 45%
Impact severity (EG Severity): CVSS 5.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
2nd
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 (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity
5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% 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.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

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

May 26, 2026

Last Modified

July 24, 2026

Advisory Details (4)

Auto-updated Jun 15, 2026
No fix on record yet.
Web page

CVE-2026-48693: FastNetMon Truncates Whatever /tmp/fastnetmon.dat Points At | Lorikeet Security

https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48693-symlink-tmp
Web page

fastnetmon/src/fastnetmon_logic.cpp at master · pavel-odintsov/fastnetmon · GitHub

https://github.com/pavel-odintsov/fastnetmon/blob/master/src/fastnetmon_logic.cpp
Web page

fastnetmon/src/fastnetmon.cpp at master · pavel-odintsov/fastnetmon · GitHub

https://github.com/pavel-odintsov/fastnetmon/blob/master/src/fastnetmon.cpp
Web page

GitHub - pavel-odintsov/fastnetmon: Very fast DDoS sensor with sFlow/Netflow/IPFIX/SPAN support · GitHub

https://github.com/pavel-odintsov/fastnetmon

Vendor Advisories for CVE-2026-48693(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
fastnetmon1.2.4-2 ... 1.2.9-1 (14 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
fastnetmon1.2.8+git20250911-1, 1.2.8+git20250911-2, 1.2.8-1, 1.2.9-0+deb13u1, 1.2.9-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
fastnetmon1.2.8+git20250911-1, 1.2.8+git20250911-2, 1.2.8-1, 1.2.9-1
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 38× 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 100 of 230 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. None are among the latest 100 rows. The 130 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  2. 2026-10-30 13:55 UTCOSV refresh
  3. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  4. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  6. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-10-25 14:23 UTCEG score recompute
  9. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  10. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  11. 2026-10-22 23:04 UTCEG score recompute
  12. 2026-10-22 23:04 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  13. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  14. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  15. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  16. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  17. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  18. 2026-10-18 03:34 UTCEG score recompute
  19. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  20. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  21. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  22. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  23. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  24. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-10-12 16:00 UTCEG score recompute
Show 75 more
  1. 2026-10-11 19:43 UTCEG score recompute
  2. 2026-10-11 16:58 UTCEG score recompute
  3. 2026-10-11 14:22 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  7. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  8. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  10. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  11. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  12. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  15. 2026-09-30 02:10 UTCOSV refresh
  16. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  17. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  18. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  19. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  20. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  22. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  23. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  24. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  25. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  26. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  27. 2026-09-11 03:23 UTCOSV refresh
  28. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  29. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  30. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  31. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  32. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  33. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  34. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  35. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  36. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  37. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  38. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  39. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  40. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  41. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  42. 2026-08-23 16:26 UTCEG score recompute
  43. 2026-08-23 16:26 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  44. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  45. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  46. 2026-08-21 21:32 UTCEG score recompute
  47. 2026-08-21 21:32 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  48. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  49. 2026-08-20 18:21 UTCEG score recompute
  50. 2026-08-20 18:21 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  51. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  52. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  53. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  54. 2026-08-17 09:36 UTCEG score recompute
  55. 2026-08-17 09:36 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  56. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  57. 2026-08-16 03:10 UTCEG score recompute
  58. 2026-08-16 03:10 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  59. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  60. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  61. 2026-08-14 01:46 UTCEG score recompute
  62. 2026-08-14 01:46 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  63. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  64. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  65. 2026-08-12 12:06 UTCEG score recompute
  66. 2026-08-12 12:06 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  67. 2026-08-11 09:49 UTCEG score recompute
  68. 2026-08-11 09:49 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  69. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  70. 2026-08-10 07:32 UTCEG score recompute
  71. 2026-08-10 07:32 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  72. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  73. 2026-08-09 05:16 UTCEG score recompute
  74. 2026-08-09 05:16 UTCGHSA enrichmentGHSA-f762-5mrw-32x8 · GitHub CVSS 5.5
  75. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile

Frequently asked(5)

What is CVE-2026-48693?
CVE-2026-48693 is a medium-severity vulnerability; its CVE record was published on May 26, 2026. FastNetMon Community Edition through 1.2.9 is vulnerable to a local symlink attack via predictable file paths in /tmp. The statistics file path defaults to '/tmp/fastnetmon.dat' (src/fastnetmon.cpp line 159). The printscreencontentsintofile() function (src/fastnetmonlogic.cpp line 2186) opens this…
When was the CVE record for CVE-2026-48693 published?
The CVE record for CVE-2026-48693 was published on May 26, 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 July 24, 2026; the record at its source may have been updated since.
Is CVE-2026-48693 actively exploited?
CVE-2026-48693 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48693?
CVE-2026-48693 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-48693?
No fix for CVE-2026-48693 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's description, written by its CNA (MITRE Corporation), states the affected versions: "FastNetMon Community Edition through 1.2.9 is vulnerable to a local symlink attack via predictable file paths in /tmp." No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-48693 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-48693

Explore →

Is Your Infrastructure Affected by CVE-2026-48693?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.