CVE-2026-49471

HIGHPre-NVD 8.38.3
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (29th 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
8.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (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: 0.4%CVSS: 8.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Serena is a powerful MCP toolkit for coding that provides semantic retrieval and editing capabilities. Prior to v1.5.2, Serena's built-in web dashboard exposes an unauthenticated Flask API on a fixed, predictable port, with no authentication, no CSRF protection, and no Host header validation. A DNS rebinding attack allows a malicious webpage to reach this API from any browser and write arbitrary content to the agent's persistent memory store, which the agent reads and acts on autonomously. Combined with execute_shell_command using shell=True, this creates a remote code execution chain requiring only that the victim visit a malicious webpage while Serena is running. This issue is fixed in version v1.5.2.

CVSS v3
8.3
EG Score
8.3HIGHmedium confidence
EG Risk
53
EG Risk 53/100

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 (value × EchelonGraph’s weight)
Severity83% × 45%
The EG Score, 8.3 of 10.
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, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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

July 7, 2026

Last Modified

July 20, 2026

Advisory Details (3)

Auto-updated Jul 7, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Unauthenticated Flask dashboard on fixed port enables DNS rebinding → memory poisoning → RCE · Advisory · oraios/serena · GitHub

https://github.com/oraios/serena/security/advisories/GHSA-37h2-6p4f-mp3q
GitHub release Patch Available

v1.5.2

Patch available: oraios/serena v1.5.2

https://github.com/oraios/serena/releases/tag/v1.5.2
GitHub commit Patch Available

commit 016ccbe1c095 (oraios/serena)

Patch available: oraios/serena v1.5.2 (contains commit 016ccbe1c095)

https://github.com/oraios/serena/commit/016ccbe1c095a3eed7967737ac1d4df2754f5d96

Vendor Advisories for CVE-2026-49471(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
serena-agent0.1.3 ... 1.5.1 (10 versions)
  • every version up to 1.5.2: fixed in 1.5.2
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 29× 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 131 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 31 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  3. 2026-10-12 16:00 UTCEG score recompute
  4. 2026-10-11 19:43 UTCEG score recompute
  5. 2026-10-11 16:57 UTCEG score recompute
  6. 2026-10-11 14:21 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  19. 2026-09-28 13:35 UTCEG score recompute
  20. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  23. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  24. 2026-09-23 06:16 UTCEG score recompute
  25. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 31st percentile
Show 75 more
  1. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  2. 2026-09-18 05:49 UTCEG score recompute
  3. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  5. 2026-09-13 23:53 UTCEG score recompute
  6. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  7. 2026-09-12 15:35 UTCEG score recompute
  8. 2026-09-12 03:42 UTCEG score recompute
  9. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  10. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  11. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  12. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  13. 2026-09-06 14:07 UTCEG score recompute
  14. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  15. 2026-09-05 22:53 UTCEG score recompute
  16. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  17. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  18. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  19. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  20. 2026-08-30 19:34 UTCEG score recompute
  21. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  22. 2026-08-30 07:42 UTCEG score recompute
  23. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  24. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  25. 2026-08-27 21:55 UTCEG score recompute
  26. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  27. 2026-08-27 01:54 UTCEG score recompute
  28. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  29. 2026-08-26 12:58 UTCEG score recompute
  30. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  31. 2026-08-24 20:38 UTCEG score recompute
  32. 2026-08-23 05:45 UTCEG score recompute
  33. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  34. 2026-08-22 04:53 UTCEG score recompute
  35. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  36. 2026-08-21 04:10 UTCEG score recompute
  37. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  38. 2026-08-20 02:11 UTCEG score recompute
  39. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  40. 2026-08-18 20:47 UTCEG score recompute
  41. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  42. 2026-08-18 03:02 UTCEG score recompute
  43. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  44. 2026-08-17 01:19 UTCEG score recompute
  45. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  46. 2026-08-16 13:26 UTCEG score recompute
  47. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  48. 2026-08-15 01:42 UTCEG score recompute
  49. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  50. 2026-08-14 01:57 UTCEG score recompute
  51. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  52. 2026-08-12 14:17 UTCEG score recompute
  53. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  54. 2026-08-11 14:31 UTCEG score recompute
  55. 2026-08-11 02:38 UTCEG score recompute
  56. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  57. 2026-08-09 15:01 UTCEG score recompute
  58. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  59. 2026-08-08 03:23 UTCEG score recompute
  60. 2026-08-06 15:44 UTCEG score recompute
  61. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  62. 2026-08-06 03:48 UTCEG score recompute
  63. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  64. 2026-08-05 01:38 UTCEG score recompute
  65. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  66. 2026-08-04 13:45 UTCEG score recompute
  67. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  68. 2026-08-03 12:56 UTCEG score recompute
  69. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  70. 2026-08-02 11:42 UTCEG score recompute
  71. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  72. 2026-08-01 11:56 UTCEG score recompute
  73. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  74. 2026-07-31 00:10 UTCEG score recompute
  75. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-49471?
CVE-2026-49471 is a high-severity vulnerability; its CVE record was published on July 7, 2026. Serena is a powerful MCP toolkit for coding that provides semantic retrieval and editing capabilities. Prior to v1.5.2, Serena's built-in web dashboard exposes an unauthenticated Flask API on a fixed, predictable port, with no authentication, no CSRF protection, and no Host header validation. A DNS…
When was the CVE record for CVE-2026-49471 published?
The CVE record for CVE-2026-49471 was published on July 7, 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 20, 2026; the record at its source may have been updated since.
Is CVE-2026-49471 actively exploited?
CVE-2026-49471 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-49471?
CVE-2026-49471 has a CVSS base score of 8.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-49471?
A fix for CVE-2026-49471 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-49471 are linked in the Vendor Advisories panel on this page.

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