CVE-2026-55256

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

Score 6.5 from GitHub Security Advisory published 2026-09-08. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
6.5EG
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: 0.3%CVSS: 6.5Exploit: None knownExposed services: Not assessed

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

In parsePartHeaders of multiple files, there is a possible persistent denial of service due to improper input validation. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not needed for exploitation.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation0.3% × 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
0.3%
EPSS %ILE
24th
KEV
Not listed

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

September 8, 2026

Last Modified

September 24, 2026

Advisory Details (1)

Auto-updated Sep 10, 2026
No fix on record yet.
Web page

Android Security Bulletin—September 2026  |  Android Open Source Project

https://source.android.com/docs/security/bulletin/2026/2026-09-01

Vendor Advisories for CVE-2026-55256(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 17× in last 7d / 82× 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. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:46 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  7. 2026-10-11 14:17 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  10. 2026-10-09 22:34 UTCEG score recompute
  11. 2026-10-09 22:34 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  13. 2026-10-09 00:31 UTCEG score recompute
  14. 2026-10-09 00:31 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  15. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  17. 2026-10-07 14:46 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  18. 2026-10-06 15:50 UTCEG score recompute
  19. 2026-10-06 15:50 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  20. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  21. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  22. 2026-10-05 17:22 UTCEG score recompute
  23. 2026-10-05 17:22 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  24. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-10-04 19:21 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
Show 75 more
  1. 2026-10-03 20:32 UTCEG score recompute
  2. 2026-10-03 20:32 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  3. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  4. 2026-10-02 22:32 UTCEG score recompute
  5. 2026-10-02 22:32 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  6. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  7. 2026-10-02 00:28 UTCEG score recompute
  8. 2026-10-02 00:28 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  9. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-10-01 02:16 UTCEG score recompute
  11. 2026-10-01 02:16 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  12. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  13. 2026-09-30 04:15 UTCEG score recompute
  14. 2026-09-30 04:15 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  15. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  16. 2026-09-29 06:01 UTCEG score recompute
  17. 2026-09-29 06:01 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  18. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  19. 2026-09-28 08:00 UTCEG score recompute
  20. 2026-09-28 08:00 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  21. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  22. 2026-09-27 09:57 UTCEG score recompute
  23. 2026-09-27 09:57 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  25. 2026-09-26 11:57 UTCEG score recompute
  26. 2026-09-26 11:57 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  27. 2026-09-25 13:51 UTCEG score recompute
  28. 2026-09-25 13:51 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34 · GitHub CVSS 6.5
  29. 2026-09-24 15:49 UTCEG score recompute
  30. 2026-09-24 15:49 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  31. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  32. 2026-09-24 11:08 UTCEG score recompute
  33. 2026-09-24 11:08 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  34. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  35. 2026-09-23 13:08 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  36. 2026-09-22 15:07 UTCEG score recompute
  37. 2026-09-22 15:07 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  38. 2026-09-21 17:06 UTCEG score recompute
  39. 2026-09-21 17:06 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  40. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  41. 2026-09-20 18:58 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  42. 2026-09-19 20:57 UTCEG score recompute
  43. 2026-09-19 20:57 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  44. 2026-09-18 22:56 UTCEG score recompute
  45. 2026-09-18 22:56 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  46. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  47. 2026-09-18 00:56 UTCEG score recompute
  48. 2026-09-18 00:56 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  49. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  50. 2026-09-17 02:55 UTCEG score recompute
  51. 2026-09-17 02:55 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  52. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  53. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  54. 2026-09-16 04:29 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  55. 2026-09-15 06:28 UTCEG score recompute
  56. 2026-09-15 06:28 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  57. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  58. 2026-09-14 08:28 UTCEG score recompute
  59. 2026-09-14 08:28 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  60. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  61. 2026-09-13 10:27 UTCEG score recompute
  62. 2026-09-13 10:27 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  63. 2026-09-12 12:26 UTCEG score recompute
  64. 2026-09-12 12:26 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  65. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  66. 2026-09-11 14:25 UTCEG score recompute
  67. 2026-09-11 14:25 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  68. 2026-09-10 16:24 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  69. 2026-09-10 15:45 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  70. 2026-09-10 15:45 UTCGHSA enrichmentGHSA-2ph9-87vp-qq34
  71. 2026-09-10 15:44 UTCMITRE cvelistV5CVSS v3 → 6.5 · severity → MEDIUM
  72. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  73. 2026-09-08 19:30 UTCNVD update
  74. 2026-09-08 18:31 UTCEG score recompute
  75. 2026-09-08 18:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55256?
CVE-2026-55256 is a medium-severity vulnerability; its CVE record was published on September 8, 2026. In parsePartHeaders of multiple files, there is a possible persistent denial of service due to improper input validation. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not needed for exploitation.
When was the CVE record for CVE-2026-55256 published?
The CVE record for CVE-2026-55256 was published on September 8, 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 September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-55256 actively exploited?
CVE-2026-55256 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (24th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55256?
CVE-2026-55256 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-55256?
No fix for CVE-2026-55256 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 vendor advisories EchelonGraph has for CVE-2026-55256 are linked in the Vendor Advisories panel on this page.

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