CVE & CISA-KEV Catalog

CVE-2026-1539

MEDIUM
5.8
CVSS v3
NVD

Description

A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to unintended destinations. When handling HTTP redirects, libsoup removes the Authorization header but does not remove the Proxy-Authorization header if the request is redirected to a different host. As a result, sensitive proxy credentials may be leaked to third-party servers. Applications using libsoup for HTTP communication may unintentionally expose proxy authentication data.

CWE-201

How to fix

Remediation Available
gir1.2-soup-3.0Ubuntu
Fixed in:3.0.7-0ubuntu1+esm7USN-8020-1
Fixed in:3.4.4-5ubuntu0.7USN-8020-1
Fixed in:3.6.5-4ubuntu0.2USN-8020-1
libsoup-3.0-0Ubuntu
Fixed in:3.0.7-0ubuntu1+esm7USN-8020-1
Fixed in:3.4.4-5ubuntu0.7USN-8020-1
Fixed in:3.6.5-4ubuntu0.2USN-8020-1
libsoup-3.0-commonUbuntu
Fixed in:3.0.7-0ubuntu1+esm7USN-8020-1
Fixed in:3.4.4-5ubuntu0.7USN-8020-1
Fixed in:3.6.5-4ubuntu0.2USN-8020-1
libsoup-3.0-devUbuntu
Fixed in:3.0.7-0ubuntu1+esm7USN-8020-1
Fixed in:3.4.4-5ubuntu0.7USN-8020-1
Fixed in:3.6.5-4ubuntu0.2USN-8020-1
libsoup-3.0-docUbuntu
Fixed in:3.0.7-0ubuntu1+esm7USN-8020-1
Fixed in:3.4.4-5ubuntu0.7USN-8020-1
Fixed in:3.6.5-4ubuntu0.2USN-8020-1
libsoup-3.0-testsUbuntu
Fixed in:3.0.7-0ubuntu1+esm7USN-8020-1
Fixed in:3.4.4-5ubuntu0.7USN-8020-1
Fixed in:3.6.5-4ubuntu0.2USN-8020-1
libsoup3Ubuntu
Fixed in:3.0.7-0ubuntu1+esm7USN-8020-1
Fixed in:3.4.4-5ubuntu0.7USN-8020-1
Fixed in:3.6.5-4ubuntu0.2USN-8020-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged

Impact

ConfidentialityLow
IntegrityNone
AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Exploit Intelligence

0.24%probability of exploitation in 30 days
15thpercentile

Low risk: more likely to be exploited than 15% of all known CVEs.

References

Vendor Advisory1
Third-Party Advisory1

Related Vulnerabilities

Other CWE-201 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2017-16026Medium5.92.6%-Fix
CVE-2020-26085Critical9.92.5%-Fix
CVE-2017-2582Medium6.52.5%-Fix
CVE-2022-27779Medium5.32.4%-Fix
CVE-2024-32825High7.52.0%--
CVE-2016-10518High7.52.0%-Fix
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Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-25.