Security readout for executives and security teams
Plain-English summary
CVE-2026-1467 affects libsoup, an HTTP client library used on Red Hat Enterprise Linux. If an application using libsoup processes a malicious URL while an HTTP proxy is configured, the attacker may inject extra HTTP headers or request content. This could cause unintended requests to reach downstream services through the proxy.
Executive priority
Treat as a moderate-priority hygiene issue, higher where proxies can reach sensitive internal services. Patch planning should follow vendor guidance, with faster action for applications that fetch external URLs through proxies.
Technical view
The flaw is CRLF injection (CWE-93) in libsoup Host header construction when URL-decoded input is used with an HTTP proxy. Network attackers can supply crafted URLs containing CRLF sequences to inject headers or complete request bodies. Red Hat rates it medium with CVSS 3.1 score 5.8, vector AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.
Likely exposure
Exposure is most relevant to systems running Red Hat Enterprise Linux 6, 7, 8, 9, or 10 with libsoup/libsoup3 installed, where applications use libsoup to fetch attacker-controlled URLs through an HTTP proxy.
Exploitation context
The provided sources do not show active exploitation, and CISA KEV is false. Exploitation requires a crafted URL reaching a vulnerable libsoup-based client while an HTTP proxy is configured. Impact is integrity-focused: unauthorized or unintended HTTP requests may be forwarded to downstream services.
Researcher notes
Evidence names affected Red Hat products and packages but does not provide fixed versions in the supplied bundle. Avoid assuming all libsoup deployments are exploitable; the described condition depends on HTTP proxy configuration and attacker-controlled URL input.
Mitigation direction
- Check Red Hat and GNOME libsoup guidance for fixed package availability.
- Prioritize updates for systems using libsoup with HTTP proxies.
- Restrict applications from fetching untrusted URLs where feasible.
- Review proxy exposure to sensitive downstream services.
- Monitor vendor advisories for affected version and patch details.
Validation and detection
- Inventory RHEL systems with libsoup or libsoup3 installed.
- Identify applications using libsoup for outbound HTTP requests.
- Confirm whether those applications use an HTTP proxy.
- Review vendor advisories for installed package status.
- Check proxy logs for unusual forwarded headers or request patterns.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-93: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-1467 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.8MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://access.redhat.com/security/cve/CVE-2026-1467CVE reference · vdb-entry, x_refsource_REDHAT
- RHBZ#2433174CVE reference · issue-tracking, x_refsource_REDHAT
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/488CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of CRLF Sequences ('CRLF Injection')
Improper Neutralization of CRLF Sequences ('CRLF Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.