CVE-2026-5119 | GNOME libsoup HTTP Proxy cleartext transmission (EUVD-2026-17062)

VDB-354152 · CVE-2026-5119 · EUVD-2026-17062 GNOME LIBSOUP HTTP PROXY CLEARTEXT TRANSMISSION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.5 $0-$5k 3.94 Summaryinfo A vulnerability categorized as problematic has been discovered in GNOME libsoup. The impacted element is an unknown function of the component HTTP Proxy Handler. Such manipulation leads to cleartext transmission. This vulnerability is uniquely identified as CVE-2026-5119. The attack can be launched remotely. No exploit exists. Detailsinfo A vulnerability, which was classified as problematic, has been found in GNOME libsoup (affected version unknown). Affected by this issue is an unknown functionality of the component HTTP Proxy Handler. The manipulation with an unknown input leads to a cleartext transmission vulnerability. Using CWE to declare the problem leads to CWE-319. The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors. Impacted is confidentiality. CVE summarizes: A flaw was found in libsoup. When establishing HTTPS tunnels through a configured HTTP proxy, sensitive session cookies are transmitted in cleartext within the initial HTTP CONNECT request. A network-positioned attacker or a malicious HTTP proxy can intercept these cookies, leading to potential session hijacking or user impersonation. The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2026-5119 since 03/30/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1040. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-17062). Productinfo Vendor GNOME Name libsoup License open-source Website Vendor: https://www.gnome.org/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.5 VulDB Meta Temp Score: 4.5 VulDB Base Score: 3.1 VulDB Temp Score: 3.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.9 CNA Vector (redhat): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Cleartext transmission CWE: CWE-319 / CWE-310 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/30/2026 Advisory disclosed 03/30/2026 +0 days CVE reserved 03/30/2026 +0 days VulDB entry created 03/30/2026 +0 days VulDB entry last update Sourcesinfo Vendor: gnome.org Advisory: access.redhat.com Status: Not defined CVE: CVE-2026-5119 (🔒) GCVE (CVE): GCVE-0-2026-5119 GCVE (VulDB): GCVE-100-354152 EUVD: 🔒 Entryinfo Created: 03/30/2026 09:43 Updated: 03/30/2026 10:16 Changes: 03/30/2026 09:43 (61), 03/30/2026 10:16 (1) Complete: 🔍 Cache ID: 99:26D:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸