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bdu:2026-12654

EUVD-2026-358702

fkie_cve-2026-54770

WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response._make_location_absolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled value such as a space followed by a protocol-relative or absolute URL can therefore bypass SCHEME_RE and startswith("//") checks and be normalized to an off-host redirect. Request.relative_url() and webob.exc._HTTPMove subclasses, including HTTPFound, are also affected because they use the same unsafe URL joining behavior or bypass the earlier normalization path. An unauthenticated attacker who can influence an application's redirect target can send users to an attacker-controlled host for phishing or OAuth and SSO token theft, but exploitation requires the user to follow the redirect. This issue is fixed in version 1.8.11.

GHSA-6hx8-3wjj-gr8g — WebOb: Open redirect in Location header normalization via leading C0 control / space characters

Affected: PyPI: webob

## Summary

This is a third follow-up to **CVE-2024-42353 / GHSA-mg3v-6m49-jhp3** and **CVE-2026-44889 / GHSA-fh3h-vg37-cc95**.

WebOb makes the `Location` header absolute when it serves a redirect. To stop a relative or protocol-relative target from redirecting users off-host, it checks the value for a URI scheme and for a leading `//`, then joins it against the request URI with `urllib.parse.urljoin()`. The previous fix additionally stripped ASCII tab/CR/LF from the value before those checks.

However, on Python 3.10+ `urllib.parse.urljoin()` (via `urlsplit()`) does more than remove tab/CR/LF: **it also strips leading and trailing C0 control characters (`U+0000`–`U+001F`) and spaces from the URL before parsing it.** Because WebOb's guard checks (`SCHEME_RE` and `startswith("//")`) run against the *un-stripped* value, a single leading space or control byte slips past them, and `urljoin()` then silently removes that byte and parses what remains as a protocol-relative — or even absolute — URL. The result is an open redirect to an attacker-controlled host.

## Details

`Response._make_location_absolute()` (in `src/webob/response.py`) performed, prior to the fix:

```python value = value.replace("\t", "").replace("\r", "").replace("\n", "")

if SCHEME_RE.search(value): # ^[a-z]+: -> already absolute, return as-is return value

if value.startswith("//"): # neutralize protocol-relative URLs value = f"/%2f{value[2:]}"

new_location = urlparse.urljoin(_…

msrc_CVE-2026-54770 — WebOb: Open redirect in Location header normalization via leading C0 control / space characters

msrc_CVE-2026-54770

openSUSE-SU-2026:11864-1 — python-WebOb-doc-1.8.11-1.1 on GA media

python-WebOb-doc-1.8.11-1.1 on GA media

PYSEC-2026-3943 — WebOb: Open redirect in Location header normalization via leading C0 control / space characters

Affected: PyPI: webob

## Summary

This is a third follow-up to **CVE-2024-42353 / GHSA-mg3v-6m49-jhp3** and **CVE-2026-44889 / GHSA-fh3h-vg37-cc95**.

## Details

`Response._make_location_absolute()` (in `src/webob/response.py`) performed, prior to the fix:

```python value = value.replace("\t", "").replace("\r", "").replace("\n", "")

if SCHEME_RE.search(value): # ^[a-z]+: -> already absolute, return as-is return value

if value.startswith("//"): # neutralize protocol-relative URLs value = f"/%2f{value[2:]}"

new_location = urlparse.urljoin(_…

RHSA-2026:69255 — Red Hat Security Advisory: Red Hat Quay 3.16.6

brace-expansion: Brace-expansion: Denial of Service due to exponential-time complexity github.com/moby/buildkit: BuildKit: Denial of Service via malicious client request quay: mirror-registry: SSRF: repo-level mirror accepts external_reference without URL validation fast-uri: Fast-uri: Security policy bypass due to URL parsing inconsistency quay: quay: Global read-only superuser can view robot account tokens crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal golang: Go os.Root: Symlink following vulnerability allows directory traversal tmp: path Traversal via unsanitized prefix/postfix enables directory escape soupsieve: Soupsieve: Denial of Service via crafted CSS selector strings Pillow: Pillow: Memory disclosure or denial of service via crafted McIdas AREA image python-pillow: Pillow: Denial of Service via excessive memory allocation when processing font files webob: WebOb: Open redirect vulnerability leading to phishing and token theft python-pillow: Pillow: Denial of Service via crafted BDF font file python-pillow: Pillow: Denial of Service via crafted GD 2.x image file golang.org/x/text: golang.org/x/text: Denial of Service via invalid UTF-8 input net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service html/template: golang: Go html/template: Cross-Site Scripting via pathological input encoding/…

SUSE-SU-2026:4351-1 — Security update for python-WebOb

Security update for python-WebOb

UBUNTU-CVE-2026-54770

Affected: Ubuntu:Pro:16.04:LTS: python-webob, Ubuntu:Pro:18.04:LTS: python-webob, Ubuntu:Pro:20.04:LTS: python-webob, Ubuntu:22.04:LTS: python-webob, Ubuntu:24.04:LTS: python-webob, Ubuntu:26.04:LTS: python-webob