MediumFix available

python-webob — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2026-44889

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.

Products: python-webob
Affected versions: 1:1.8.10-1, 1:1.8.11-1, 1:1.8.6-3, 1:1.8.7-1, 1:1.8.7-2, 1:1.8.7-3, 1:1.8.9-1, 1:1.8.9-2
Fixed versions: 1:1.8.10-0+deb13u1, 1:1.8.10-1
CVEs: CVE-2026-44889
Confirmed fixed CVEs: Not specified
Updated in this feed: 1 Nov 2026, 12:15 UTC · Revision 2

Source evidence

DEBIAN-CVE-2026-44889

core-osv · Original source

Published 22 Jun 2026, 22:16 UTC

osv:DEBIAN-CVE-2026-44889

python-webob

Fixed versions: Not specified

python-webob

Fixed versions: 1:1.8.10-0+deb13u1

python-webob

Fixed versions: 1:1.8.10-1

Complete source record

{
  "id": "32a7badcd363bdc66ea86a4a1209fd1dee47654c02457c95e0d47e125db80c60",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-44889",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-44889",
    "summary": "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.",
    "evidence": "osv:DEBIAN-CVE-2026-44889",
    "products": [
      {
        "name": {
          "value": "python-webob",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:1.8.10-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:1.8.11-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:1.8.6-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:1.8.7-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:1.8.7-2",
            "evidence": "/affected/0/versions"
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          {
            "value": "1:1.8.7-3",
            "evidence": "/affected/0/versions"
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            "evidence": "/affected/1/versions"
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        "fixed_versions": [
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          },
          {
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            "evidence": "/affected/2/versions"
          }
        ]
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    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2026-44889",
      "aliases": [
        "DEBIAN-CVE-2026-44889"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
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              "type": "ECOSYSTEM",
              "events": [
                {
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          ],
          "package": {
            "name": "python-webob",
            "purl": "pkg:deb/debian/python-webob?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
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            "1:1.8.11-1",
            "1:1.8.6-3",
            "1:1.8.7-1",
            "1:1.8.7-2",
            "1:1.8.7-3",
            "1:1.8.9-1",
            "1:1.8.9-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44889.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
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          ],
          "package": {
            "name": "python-webob",
            "purl": "pkg:deb/debian/python-webob?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
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          "database_specific": {
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          },
          "ecosystem_specific": {
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        },
        {
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          ],
          "package": {
            "name": "python-webob",
            "purl": "pkg:deb/debian/python-webob?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "1:1.8.9-1",
            "1:1.8.9-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44889.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-26T11:47:29.056938749Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-44889"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-44889"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-44889",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 450741,
  "published_at": "2026-06-22T22:16:46.35+00:00"
}