CVE-2026-55096

HIGHPre-NVD 7.17.1
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (16th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-88377 (ENISA EUVD)Source: ENISA EUVD

7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.1Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

fast-mcp-telegram is a Telegram MCP Server. Prior to version 30.1, the send_message/send_message_to_phone MCP tools accept files as a list of http(s) URLs, which the server downloads and attaches to the outgoing Telegram message. Downloads are guarded by _validate_url_security, an SSRF denylist that checks the URL's literal hostname string but never resolves DNS. The fetch (httpx.AsyncClient.get) does its own resolution at request time. Consequently a hostname that resolves to a loopback / private / link-local address passes the guard and is fetched — even with the secure defaults block_private_ips=True and allow_http_urls=False. Because the fetched body is returned to the attacker as a Telegram file attachment, this is a full-read, exfiltrating SSRF, not blind. This issue has been patched in version 30.1.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
48
EG Risk 48/100

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)
Severity71% × 45%
Impact severity (EG Severity): CVSS 7.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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
0.3%
EPSS %ILE
16th
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 (7.1): severity, escalated by confirmed exploitation. This CVE's 7.1 is its impact severity (EG Severity), not escalated.

EG Severity
7.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). 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 low or medium mission impact; Track* at high (mission-essential systems).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, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation public PoC (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.

The score's inputs: 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

September 28, 2026

Last Modified

October 1, 2026

Advisory Details (3)

Auto-updated Sep 28, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

DNS validation closes SSRF vector in file download

Patch available: leshchenko1979/fast-mcp-telegram 0.30.1

https://github.com/leshchenko1979/fast-mcp-telegram/releases/tag/0.30.1
GitHub commit Patch Available

commit e6b3032cfc90 (leshchenko1979/fast-mcp-telegram)

Patch available: leshchenko1979/fast-mcp-telegram 0.30.1 (contains commit e6b3032cfc90)

https://github.com/leshchenko1979/fast-mcp-telegram/commit/e6b3032cfc906e14f5b84f2c2b8ec378eb457e57
GitHub advisoryMentions a patch (unverified)

SSRF via DNS-resolution gap in _validate_url_security (file download by URL) · Advisory · leshchenko1979/fast-mcp-telegram · GitHub

https://github.com/leshchenko1979/fast-mcp-telegram/security/advisories/GHSA-xr72-j7vj-vp7g

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 44× 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.

  1. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  4. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  5. 2026-10-30 08:53 UTCEG score recompute
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  7. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  10. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  11. 2026-10-25 14:19 UTCEG score recompute
  12. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  13. 2026-10-23 18:22 UTCEG score recompute
  14. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  15. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  17. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  18. 2026-10-18 03:30 UTCEG score recompute
  19. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  20. 2026-10-17 03:34 UTCEG score recompute
  21. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  22. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  23. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  24. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  25. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
Show 35 more
  1. 2026-10-12 15:56 UTCEG score recompute
  2. 2026-10-11 19:39 UTCEG score recompute
  3. 2026-10-11 16:54 UTCEG score recompute
  4. 2026-10-11 14:17 UTCEG score recompute
  5. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  6. 2026-10-10 20:40 UTCEG score recompute
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  8. 2026-10-10 07:41 UTCEG score recompute
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  10. 2026-10-09 05:48 UTCEG score recompute
  11. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  12. 2026-10-08 03:16 UTCEG score recompute
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  14. 2026-10-07 00:51 UTCEG score recompute
  15. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  16. 2026-10-05 22:56 UTCEG score recompute
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  18. 2026-10-05 10:01 UTCEG score recompute
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  20. 2026-10-03 19:12 UTCEG score recompute
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  22. 2026-10-03 06:16 UTCEG score recompute
  23. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  24. 2026-10-02 04:22 UTCEG score recompute
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  26. 2026-10-01 15:24 UTCEG score recompute
  27. 2026-10-01 14:51 UTCEG score recompute
  28. 2026-09-30 20:02 UTCEG score recompute
  29. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  30. 2026-09-29 19:26 UTCEG score recompute
  31. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  32. 2026-09-29 06:31 UTCEG score recompute
  33. 2026-09-28 17:34 UTCEG score recompute
  34. 2026-09-28 16:53 UTCEG score recomputeFirst assessed: 7.1 HIGH
  35. 2026-09-28 16:51 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55096?
CVE-2026-55096 is a high-severity vulnerability; its CVE record was published on September 28, 2026. fast-mcp-telegram is a Telegram MCP Server. Prior to version 30.1, the send_message/send_message_to_phone MCP tools accept files as a list of http(s) URLs, which the server downloads and attaches to the outgoing Telegram message. Downloads are guarded by _validate_url_security, an SSRF denylist…
When was the CVE record for CVE-2026-55096 published?
The CVE record for CVE-2026-55096 was published on September 28, 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 October 1, 2026; the record at its source may have been updated since.
Is CVE-2026-55096 actively exploited?
CVE-2026-55096 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55096?
CVE-2026-55096 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55096?
A fix for CVE-2026-55096 is available: update to the fixed version the vendor names in its advisory.

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