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Vulnerability record · CVE-2026-102555 · published 29 September 2026

CVE-2026-102555: Gnome libsoup out-of-bounds read vulnerability

Gnome · Libsoup

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.

8.2 CVSS 3.1 High EPSS 0.48% · top 58.1% CWE-125 · Out-of-bounds read
8.2CVSS 3.1 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
5References
11 Nov 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:83618
https://access.redhat.com/errata/RHSA-2026:93583
https://access.redhat.com/errata/RHSA-2026:98560
https://access.redhat.com/security/cve/CVE-2026-102555 MitigationVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2543224 Issue TrackingVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-102555), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.