CVE-2026-48737

MEDIUMPre-NVD 4.94.9
EchelonGraph scoreMEDIUM confidence

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

Score 4.9 from GitHub Security Advisory published 2026-07-09. A secondary CVSS source baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Elevated

Also known asEUVD-2026-78593 (ENISA EUVD) · GHSA-m5x5-28jr-gpjj (GitHub Security Advisories) · PYSEC-2026-2995 (OSV.dev)Source: ENISA EUVD

4.9EG
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: 4.9Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev101, is_global_address in src/pyload/core/utils/web/check.py relies on Python's global-address classification without examining IPv4 destinations embedded in 6to4 or NAT64 IPv6 addresses. A low-privileged user can submit an IPv6 literal through parse_urls to the pre-resolution is_global_host guard. Because host_to_ip is pinned to AF_INET, that guard does not evaluate a hostname's AAAA result. Separately, curl resolves hostnames before the pycurl PREREQFUNC in src/pyload/core/network/http/http_request.py applies the same vulnerable is_global_address check to the actual connection address, so a transition-form AAAA result can be permitted even when it terminates at an embedded loopback, private, CGNAT, or link-local IPv4 address. Exploitation requires the pyLoad host to route the applicable transition mechanism, including 6to4 on affected Python 3.9 through 3.11 deployments or NAT64 on a network with a NAT64 gateway. Successful exploitation can enable internal-network reconnaissance, timing-based confirmation, limited service disruption, or cloud metadata disclosure where the wrapped address is routable. This issue is fixed in version 0.5.0b3.dev101.

CVSS v3
4.9
EG Score
4.9MEDIUMmedium confidence
EG Risk
38
EG Risk 38/100

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)
Severity49% × 45%
Impact severity (EG Severity): CVSS 4.9 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: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
21st
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 (4.9): severity, escalated by confirmed exploitation. This CVE's 4.9 is its impact severity (EG Severity), not escalated.

EG Severity
4.9 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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).

The CVE record names the fixed release. 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

July 9, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
Fix named in the CVE record. Sources: github, github_commit.
GitHub commit

commit ba7491046b2d (pyload/pyload)

Fix landed in pyload/pyload commit ba7491046b2d — awaiting tagged release

https://github.com/pyload/pyload/commit/ba7491046b2d430732be490913e4cbf1f1e899c2
GitHub advisoryMentions a patch (unverified)

SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs · Advisory · pyload/pyload · GitHub

https://github.com/pyload/pyload/security/advisories/GHSA-m5x5-28jr-gpjj

Vendor Advisories for CVE-2026-48737(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
pippyload-ng—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
pyload-ng0.5.0a5.dev528 ... 0.5.0b3.dev99 (105 versions)
  • every version through 0.5.0b3.dev100: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× 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 117 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 17 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  3. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  4. 2026-10-30 13:55 UTCOSV refresh
  5. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  6. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  7. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  8. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  9. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  10. 2026-10-25 14:23 UTCEG score recompute
  11. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  12. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  13. 2026-10-22 23:04 UTCEG score recompute
  14. 2026-10-22 23:04 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  15. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  16. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  17. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  18. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  19. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  20. 2026-10-18 03:34 UTCEG score recompute
  21. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  22. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  23. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  24. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  25. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
Show 75 more
  1. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-12 16:00 UTCEG score recompute
  3. 2026-10-11 19:43 UTCEG score recompute
  4. 2026-10-11 16:58 UTCEG score recompute
  5. 2026-10-11 14:22 UTCEG score recompute
  6. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  9. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  12. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  14. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-10-01 16:03 UTCEG score recompute
  17. 2026-10-01 16:03 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-09-28 10:58 UTCEG score recompute
  21. 2026-09-28 10:58 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  24. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  25. 2026-09-24 11:40 UTCEG score recompute
  26. 2026-09-24 11:40 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  27. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  28. 2026-09-23 05:59 UTCEG score recompute
  29. 2026-09-23 05:59 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  30. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  31. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  32. 2026-09-18 05:37 UTCEG score recompute
  33. 2026-09-18 05:37 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  34. 2026-09-16 17:53 UTCEG score recompute
  35. 2026-09-16 17:53 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  36. 2026-09-16 17:11 UTCEG score recompute
  37. 2026-09-16 17:11 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  38. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  39. 2026-09-16 13:47 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  40. 2026-09-15 15:35 UTCEG score recompute
  41. 2026-09-15 15:35 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  42. 2026-09-15 14:43 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  43. 2026-09-14 08:55 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  44. 2026-09-13 08:20 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  45. 2026-09-12 03:25 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  46. 2026-09-05 22:36 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  47. 2026-08-30 06:56 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  48. 2026-08-27 21:46 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  49. 2026-08-26 08:19 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  50. 2026-08-25 07:31 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  51. 2026-08-24 06:55 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  52. 2026-08-23 06:19 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  53. 2026-08-22 05:43 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  54. 2026-08-21 05:07 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  55. 2026-08-20 04:31 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  56. 2026-08-19 03:54 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  57. 2026-08-18 02:55 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  58. 2026-08-17 01:22 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  59. 2026-08-16 00:46 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  60. 2026-08-15 00:10 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  61. 2026-08-13 23:35 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  62. 2026-08-12 22:59 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  63. 2026-08-11 22:24 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  64. 2026-08-10 21:48 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  65. 2026-08-09 21:12 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  66. 2026-08-08 20:37 UTCEG score recompute
  67. 2026-08-08 20:37 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  68. 2026-08-07 20:01 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  69. 2026-08-06 19:25 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  70. 2026-08-05 18:49 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  71. 2026-08-04 18:14 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  72. 2026-08-03 17:29 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  73. 2026-08-02 16:53 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  74. 2026-08-01 16:17 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9
  75. 2026-07-31 15:41 UTCGHSA enrichmentGHSA-m5x5-28jr-gpjj · GitHub CVSS 4.9

Frequently asked(5)

What is CVE-2026-48737?
CVE-2026-48737 is a medium-severity vulnerability; its CVE record was published on July 9, 2026. pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev101, is_global_address in src/pyload/core/utils/web/check.py relies on Python's global-address classification without examining IPv4 destinations embedded in 6to4 or NAT64 IPv6 addresses. A low-privileged user…
When was the CVE record for CVE-2026-48737 published?
The CVE record for CVE-2026-48737 was published on July 9, 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 16, 2026; the record at its source may have been updated since.
Is CVE-2026-48737 actively exploited?
CVE-2026-48737 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48737?
CVE-2026-48737 has a CVSS base score of 4.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-48737?
The CVE record for CVE-2026-48737 names the fix: "This issue is fixed in version 0.5.0b3.dev101." The vendor advisories EchelonGraph has for CVE-2026-48737 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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