CVE-2026-109426

HIGHPre-NVD 7.57.5
EchelonGraph scoreHIGH confidence

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

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-10-12. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-97910 (ENISA EUVD) · GHSA-f4vq-cf7c-pvmv (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.5Exploit: 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 CNA (VulnCheck) lists weebzone Telegram-Stremio versions up to and including 5.1.0 as affected. No release containing a fix is confirmed on record.

Telegram-Stremio through 5.1.0 contains an insecure storage vulnerability that allows attackers with access to the MongoDB database, backups, or logs to recover the operator's authenticated Telegram session string, which is protected only by a keyless, reversible encoding transform rather than actual encryption. Attackers can round-trip the stored value through the repository's own decode_string function with no secret key to obtain a fully authenticated Telegram session, granting complete control of the operator's Telegram account even when two-step verification is enabled.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
49
EG Risk 49/100

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)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.1%
EPSS %ILE
1st
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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-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 (model v2026.06.15, score date 2026-10-27). 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; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.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; Attend at high (mission-essential systems).

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

October 12, 2026

Last Modified

October 16, 2026

Advisory Details (2)

Auto-updated Oct 12, 2026
No fix on record yet.
Web page

Telegram-Stremio 5.1.0 Insecure Session Storage via encode_string | Advisories | VulnCheck

https://www.vulncheck.com/advisories/telegram-stremio-insecure-session-storage-via-encode-string
Web page

Telegram-Stremio: unsigned stream IDs and missing object-level authorization (public reference for VulnCheck CVD 86357f79) · GitHub

https://gist.github.com/mansurmavlankulov/489554cad7b38e07b9651c217f00fffb

Vendor Advisories for CVE-2026-109426(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 32× 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 16:43 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  4. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  5. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-10-27 20:39 UTCEG score recompute
  7. 2026-10-27 20:39 UTCGHSA enrichmentGHSA-f4vq-cf7c-pvmv · GitHub severity HIGH · GitHub CVSS 7.5
  8. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  9. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  10. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  11. 2026-10-25 14:53 UTCEG score recompute
  12. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  13. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  14. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  15. 2026-10-20 19:10 UTCEG score recompute
  16. 2026-10-20 19:10 UTCGHSA enrichmentGHSA-f4vq-cf7c-pvmv · GitHub severity HIGH · GitHub CVSS 7.5
  17. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  19. 2026-10-18 05:06 UTCEG score recompute
  20. 2026-10-16 19:30 UTCEG score recompute
  21. 2026-10-16 19:30 UTCGHSA enrichmentGHSA-f4vq-cf7c-pvmv · GitHub severity HIGH · GitHub CVSS 7.5
  22. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  23. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
Show 7 more
  1. 2026-10-13 16:28 UTCEG score recompute
  2. 2026-10-13 16:28 UTCGHSA enrichmentGHSA-f4vq-cf7c-pvmv · GitHub severity HIGH · GitHub CVSS 7.5
  3. 2026-10-13 16:01 UTCEG score recompute
  4. 2026-10-13 16:01 UTCGHSA enrichmentGHSA-f4vq-cf7c-pvmv · GitHub severity HIGH · GitHub CVSS 7.5
  5. 2026-10-12 21:26 UTCEG score recompute
  6. 2026-10-12 20:41 UTCEG score recomputeFirst assessed: 7.5 HIGH
  7. 2026-10-12 20:40 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-109426?
CVE-2026-109426 is a high-severity vulnerability; its CVE record was published on October 12, 2026. Telegram-Stremio through 5.1.0 contains an insecure storage vulnerability that allows attackers with access to the MongoDB database, backups, or logs to recover the operator's authenticated Telegram session string, which is protected only by a keyless, reversible encoding transform rather than…
When was CVE-2026-109426 made public?
CVE-2026-109426 was made public on October 2, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on October 12, 2026. EchelonGraph's copy of the record carries a last-modified date of October 16, 2026; the record at its source may have been updated since.
Is CVE-2026-109426 actively exploited?
CVE-2026-109426 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-109426?
CVE-2026-109426 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-109426?
No fix for CVE-2026-109426 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 CNA (VulnCheck) lists weebzone Telegram-Stremio versions up to and including 5.1.0 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-109426 are linked in the Vendor Advisories panel on this page.

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