Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-102555

CVE-2026-102555HIGH

Red Hat Red Hat Enterprise Linux 10 — Libsoup: libsoup: heap buffer overflow via uninitialized length in data-uri base64 decoding

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  L  N  H    8.2   .0037   29.2     —

AFFECTED
  Product                      Versions     Fixed
  Red Hat Enterprise Linux 10  unspecified  0:3.6.5-3.el10_2.20
  Red Hat Enterprise Linux 6   unspecified  —
  Red Hat Enterprise Linux 7   unspecified  —
  Red Hat Enterprise Linux 8   unspecified  —
  Red Hat Enterprise Linux 9   unspecified  —

TIMELINE
  Sep 29  Reserved by redhat
  Sep 29  Published (CNA: redhat)
  Oct 15  PATCH SHIPPED — CVE-2026-102555 (Red Hat Enterprise Linux 10). Fixed in Red Hat Enterprise Linux 10 0:3.6.5-3.el10_2.20.

CWE-125 · CNA: redhat · CVSS v3.1 · 3 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 29, 2026	Reserved	Reserved by redhat
September 29, 2026	Published	Published (CNA: redhat)
October 15, 2026	PATCH SHIPPED	PATCH SHIPPED — CVE-2026-102555 (Red Hat Enterprise Linux 10). Fixed in Red Hat Enterprise Linux 10 0:3.6.5-3.el10_2.20.

Affected

Affected products and packages — 5 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Red Hat	Red Hat Enterprise Linux 10	—	—	0:3.6.5-3.el10_2.20
Red Hat	Red Hat Enterprise Linux 6	—	—	—
Red Hat	Red Hat Enterprise Linux 7	—	—	—
Red Hat	Red Hat Enterprise Linux 8	—	—	—
Red Hat	Red Hat Enterprise Linux 9	—	—	—

Weaknesses

CWE-125

References (3)

https://access.redhat.com/errata/RHSA-2026:83618
https://access.redhat.com/security/cve/CVE-2026-102555 [Mitigation, Vendor Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=2543224 [Issue Tracking, Vendor Advisory]

Authoritative record: CVE-2026-102555 at cve.org

Vendors: red hat

Weaknesses: CWE-125

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-102555 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.