CVE-2026-44889

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 81% 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
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

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

WebOb provides objects for HTTP requests and responses. Prior to 1.8.10, the normalization of the HTTP Location header during a redirect is vulnerable to an open redirect: WebOb joins the redirect target to the request URI using Python's urljoin, and since Python 3.10 the underlying urlsplit strips ASCII tab, carriage return, and newline characters before parsing, so a redirect target containing such characters can be reinterpreted as a protocol-relative URL whose authority is an attacker-controlled host. This bypasses the CVE-2024-42353 fix that escaped a leading double slash, allowing an attacker who influences the redirect location to send users to an arbitrary external site instead of the intended one. This vulnerability is fixed in 1.8.10.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

June 4, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 23, 2026
Patch available. Sources: github.
github Patch Available

Location header normalization during redirect leads to open redirect - again · Advisory · Pylons/webob · GitHub

https://github.com/Pylons/webob/security/advisories/GHSA-fh3h-vg37-cc95

Vendor Advisories for CVE-2026-44889(2)

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

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
python-webob1:1.8.10-1 ... 1:1.8.9-2 (9 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
python-webob1:1.8.10-1 ... 1:1.8.9-2 (7 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
python-webob1:1.8.9-1, 1:1.8.9-21:1.8.10-0+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
python-webob1:1.8.9-1, 1:1.8.9-21:1.8.10-1—
PyPI(1)
PackageVulnerable rangeFixed inDependents
webob0.8 ... 1.8.9 (73 versions)1.8.10—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 63× 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.

Showing the most recent 100 of 116 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-44889?
CVE-2026-44889 is a medium vulnerability published on June 4, 2026. WebOb provides objects for HTTP requests and responses. Prior to 1.8.10, the normalization of the HTTP Location header during a redirect is vulnerable to an open redirect: WebOb joins the redirect target to the request URI using Python's urljoin, and since Python 3.10 the underlying urlsplit strips…
When was CVE-2026-44889 disclosed?
CVE-2026-44889 was first published in the National Vulnerability Database on June 4, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44889 actively exploited?
CVE-2026-44889 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 81.4% of all scored CVEs.
What is the CVSS score of CVE-2026-44889?
CVE-2026-44889 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-44889?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44889, 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.

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