Quick answers
- Is CVE-2026-102555 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-102555 being exploited in the wild.
- How severe is CVE-2026-102555?
- High severity, with a CVSS score of 8.2, published 29 September 2026.
- Which products and versions are affected?
- GNOME libsoup.
- Is there a fix for CVE-2026-102555?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-102555 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-102555?
- Check whether you run Gnome Libsoup. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The soup_uri_decode_data_uri() function incorrectly treats base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contains embedded NUL bytes, the decoded length remains uninitialized and is used as the size of the returned GBytes, leading to out-of-bounds read. The vulnerability is triggered when an application passes untrusted data URIs to this function.
Affected products
- GNOME libsoup
Timeline
- 2026-09-29: disclosed