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: 0.2%, top 94% 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
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.1Exploit: NoneExposed: 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)
EPSS
5.7%
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

(1 across 1 ecosystem)
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 15× in last 7d / 48× 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. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 02:59 UTCEG score recompute
  3. 2026-07-06 02:59 UTCVendor advisory
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 02:30 UTCEPSS rescore
  6. 2026-07-04 06:31 UTCEPSS rescore
  7. 2026-07-03 21:36 UTCEG score recompute
  8. 2026-07-03 21:36 UTCVendor advisory
  9. 2026-07-02 21:04 UTCEG score recompute
  10. 2026-07-02 21:04 UTCVendor advisory
  11. 2026-07-01 20:24 UTCEG score recompute
  12. 2026-07-01 20:24 UTCVendor advisory
  13. 2026-07-01 15:07 UTCEPSS rescore
  14. 2026-06-30 23:22 UTCEPSS rescore
  15. 2026-06-30 20:05 UTCEG score recompute
  16. 2026-06-29 14:06 UTCEPSS rescore
  17. 2026-06-29 14:06 UTCEPSS rescore
  18. 2026-06-29 10:00 UTCEG score recompute
  19. 2026-06-28 14:07 UTCEPSS rescore
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-28 04:56 UTCEPSS rescore
  22. 2026-06-28 04:04 UTCEG score recompute
  23. 2026-06-27 03:44 UTCEG score recompute
  24. 2026-06-27 03:08 UTCEPSS rescore
  25. 2026-06-26 03:17 UTCEG score recompute
Show 26 more
  1. 2026-06-25 13:49 UTCEPSS rescore
  2. 2026-06-25 13:49 UTCEPSS rescore
  3. 2026-06-25 02:57 UTCEG score recompute
  4. 2026-06-24 14:05 UTCEPSS rescore
  5. 2026-06-24 02:37 UTCEG score recompute
  6. 2026-06-23 21:33 UTCEPSS rescore
  7. 2026-06-23 02:17 UTCEG score recompute
  8. 2026-06-19 23:49 UTCEG score recompute
  9. 2026-06-18 21:25 UTCEG score recompute
  10. 2026-06-17 20:57 UTCEG score recompute
  11. 2026-06-16 20:38 UTCEG score recompute
  12. 2026-06-15 20:18 UTCEG score recompute
  13. 2026-06-14 23:18 UTCEPSS rescore
  14. 2026-06-14 19:57 UTCEG score recompute
  15. 2026-06-13 23:00 UTCEPSS rescore
  16. 2026-06-13 19:38 UTCEG score recompute
  17. 2026-06-12 23:12 UTCEPSS rescore
  18. 2026-06-12 19:18 UTCEG score recompute
  19. 2026-06-11 18:59 UTCEG score recompute
  20. 2026-06-10 18:40 UTCEG score recompute
  21. 2026-06-09 18:21 UTCEG score recompute
  22. 2026-06-08 18:02 UTCEG score recompute
  23. 2026-06-07 16:07 UTCEG score recompute
  24. 2026-06-06 15:48 UTCEG score recompute
  25. 2026-06-05 15:29 UTCEG score recompute
  26. 2026-06-04 15:10 UTCEG score recompute

Related CVEs(same vendor + same CWE)

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 5.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

Dependency Blast Radius

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