CVE-2026-1467

Libsoup: libsoup: http header injection via specially crafted urls when an http proxy is configured

publishedCWE-93

A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-decoded input used to create the Host header. A remote attacker can exploit this by providing a specially crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy, potentially impacting downstream services.

Technical severity5.8 mediumCVSS 3.1 · CNA: redhat

Published2026-01-27Source updated 2026-11-05

Collected2026-11-053 attributed sources

Fixes and workarounds

Workaround

To mitigate this issue, avoid processing untrusted URLs in applications that use the libsoup library with an HTTP proxy configured. Restricting network access to the HTTP proxy can also limit potential exposure.

Source: CNA: redhat

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Red Hat Enterprise Linux 10 Red Hat `libsoup3` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 6 Red Hat `libsoup` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 7 Red Hat `libsoup` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `libsoup` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `libsoup` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (1)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:gnome:libsoup:-:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 5.8 medium	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N`	CNA: redhat
3.1 / 5.3 medium	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`	NVD: [email protected]
3.1 / 5.8 medium	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N`	NVD: [email protected]

Exploit evidence

https://gitlab.gnome.org/GNOME/libsoup/-/issues/488
exploit · [email protected]

References

https://access.redhat.com/security/cve/CVE-2026-1467CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2433174CNA: redhat · issue-tracking, x_refsource_REDHAT
https://gitlab.gnome.org/GNOME/libsoup/-/issues/488CNA: redhat
https://access.redhat.com/security/cve/CVE-2026-1467[email protected] · Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2433174[email protected] · Issue Tracking, Third Party Advisory
https://gitlab.gnome.org/GNOME/libsoup/-/issues/488[email protected] · Exploit, Issue Tracking, Vendor Advisory

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