CVE-2026-16599

MEDIUMPre-NVD 5.15.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 68% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
5.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.1Exploit: None knownExposed: 0

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

GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication functionality. The server-supplied sequence number from the FTP challenge line is used as an iteration count for an MD5 key-derivation loop without any upper bound validation. A malicious FTP server or a network attacker positioned to intercept FTP traffic can send a crafted OPIE challenge with a sequence number near INT_MAX, causing wget to perform up to approximately 2.1 billion MD5 computations and suspend for some time. The --timeout option does not mitigate this because it applies only to network I/O, not CPU computation.

This issue was fixed in commit e9697d98e7249b0f68a6be040a4f3dcc5bc101fa

CVSS v3
5.1
EG Score
5.1(medium)
EG Risk
23(Track)
EG Risk 23/100SSVC: Track

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
Severity51% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 28, 2026

Advisory Details (3)

Auto-updated Aug 25, 2026
No patch confirmed yet.
generic

Fix server-controlled unbounded MD5 loop in FTP OPIE (e9697d98) · Commits · Wget / wget · GitLab

https://gitlab.com/gnuwget/wget/-/commit/e9697d98e7249b0f68a6be040a4f3dcc5bc101fa
generic

Wget / wget · GitLab

https://gitlab.com/gnuwget/wget
generic

Vulnerability in GNU wget software | CERT Polska

https://cert.pl/en/posts/2026/08/CVE-2026-16599

Vendor Advisories for CVE-2026-16599(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
wget1.21.3-1 ... 1.25.0-3 (8 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
wget1.25.0-2, 1.25.0-3——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
wget1.25.0-2, 1.25.0-3——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 68× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-09-18 23:42 UTCEG score recompute
  2. 2026-09-18 23:42 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-18 00:05 UTCEG score recompute
  5. 2026-09-18 00:05 UTCGHSA enrichment
  6. 2026-09-16 23:13 UTCEG score recompute
  7. 2026-09-16 23:13 UTCGHSA enrichment
  8. 2026-09-16 14:07 UTCEPSS rescore
  9. 2026-09-16 05:14 UTCEPSS rescore
  10. 2026-09-15 23:35 UTCEG score recompute
  11. 2026-09-15 23:35 UTCGHSA enrichment
  12. 2026-09-14 23:43 UTCGHSA enrichment
  13. 2026-09-13 23:23 UTCEG score recompute
  14. 2026-09-13 23:23 UTCGHSA enrichment
  15. 2026-09-13 16:46 UTCEPSS rescore
  16. 2026-09-12 23:46 UTCEG score recompute
  17. 2026-09-12 23:46 UTCGHSA enrichment
  18. 2026-09-12 15:00 UTCEPSS rescore
  19. 2026-09-12 00:09 UTCEG score recompute
  20. 2026-09-12 00:08 UTCGHSA enrichment
  21. 2026-09-11 14:52 UTCEPSS rescore
  22. 2026-09-11 09:36 UTCEPSS rescore
  23. 2026-09-11 00:29 UTCEG score recompute
  24. 2026-09-11 00:29 UTCGHSA enrichment
  25. 2026-09-10 09:34 UTCEPSS rescore
Show 43 more
  1. 2026-09-10 00:52 UTCGHSA enrichment
  2. 2026-09-09 01:15 UTCEG score recompute
  3. 2026-09-09 01:15 UTCGHSA enrichment
  4. 2026-09-08 22:00 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-07 15:18 UTCEG score recompute
  7. 2026-09-07 15:18 UTCGHSA enrichment
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-06 12:47 UTCEG score recompute
  10. 2026-09-06 12:47 UTCGHSA enrichment
  11. 2026-09-05 13:10 UTCEG score recompute
  12. 2026-09-05 13:10 UTCGHSA enrichment
  13. 2026-09-04 13:32 UTCEG score recompute
  14. 2026-09-04 13:32 UTCGHSA enrichment
  15. 2026-09-04 05:06 UTCEPSS rescore
  16. 2026-09-03 13:46 UTCEG score recompute
  17. 2026-09-03 13:46 UTCGHSA enrichment
  18. 2026-09-02 14:11 UTCEPSS rescore
  19. 2026-09-02 14:08 UTCGHSA enrichment
  20. 2026-09-01 14:32 UTCEG score recompute
  21. 2026-09-01 14:31 UTCGHSA enrichment
  22. 2026-09-01 13:53 UTCEPSS rescore
  23. 2026-08-31 14:48 UTCEG score recompute
  24. 2026-08-31 14:48 UTCGHSA enrichment
  25. 2026-08-30 19:17 UTCEPSS rescore
  26. 2026-08-30 15:09 UTCEG score recompute
  27. 2026-08-30 15:09 UTCGHSA enrichment
  28. 2026-08-30 01:22 UTCEPSS rescore
  29. 2026-08-29 15:30 UTCEG score recompute
  30. 2026-08-29 15:30 UTCGHSA enrichment
  31. 2026-08-28 21:41 UTCEPSS rescore
  32. 2026-08-28 15:52 UTCGHSA enrichment
  33. 2026-08-28 14:22 UTCGHSA enrichment
  34. 2026-08-27 14:41 UTCEG score recompute
  35. 2026-08-27 14:40 UTCGHSA enrichment
  36. 2026-08-27 14:25 UTCEPSS rescore
  37. 2026-08-26 14:59 UTCEG score recompute
  38. 2026-08-26 14:59 UTCGHSA enrichment
  39. 2026-08-26 14:46 UTCEPSS rescore
  40. 2026-08-25 15:21 UTCEG score recompute
  41. 2026-08-25 15:15 UTCEG score recompute
  42. 2026-08-25 14:35 UTCEG score recompute
  43. 2026-08-25 14:34 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-16599?
CVE-2026-16599 is a medium vulnerability published on August 25, 2026. GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication functionality. The server-supplied sequence number from the FTP challenge line is used as an iteration count for an MD5 key-derivation loop without any upper bound validation. A malicious FTP server or a network…
When was CVE-2026-16599 disclosed?
CVE-2026-16599 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16599 actively exploited?
CVE-2026-16599 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.1% of all scored CVEs.
What is the CVSS score of CVE-2026-16599?
CVE-2026-16599 has a CVSS v3 base score of 5.1 (NVD).
How do I remediate CVE-2026-16599?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16599, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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