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CVE-2026-102555

8.2 · HIGH

A flaw was found in libsoup.

Published Sep 29, 2026gnomeCWE-125EPSS 0.45%

Overview

CVE-2026-102555 is a high-severity vulnerability affecting gnome libsoup. It was published on September 29, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used as the size of the returned GBytes. This can lead to an out-of-bounds read or application crash when processing a crafted data URI.

Remediation

Check the references section for vendor advisories and patches from gnome. Update libsoup to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
gnomelibsoup>= 0, < 3.7.3Affected

References

Refaccess.redhat.com/errata/RHSA-2026:83618Refaccess.redhat.com/errata/RHSA-2026:93583Refaccess.redhat.com/security/cve/CVE-2026-102555Refbugzilla.redhat.com/show_bug.cgi?id=2543224

How CyberStrike helps

Frequently asked questions

What is CVE-2026-102555?

CVE-2026-102555 is a high-severity vulnerability affecting gnome libsoup. It was published on September 29, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-102555?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-102555?

Check the references section for vendor advisories and patches from gnome. Update libsoup to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-102555?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-102555 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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