CVE-2026-102555— Libsoup: libsoup: heap buffer overflow via uninitialized length in data-uri base64 decoding
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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
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I. Basic Information for CVE-2026-102555
Vulnerability Information
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Vulnerability Title
Libsoup: libsoup: heap buffer overflow via uninitialized length in data-uri base64 decoding
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
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| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
II. Public POCs for CVE-2026-102555
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-102555 (2)
Same Patch Batch · Red Hat · 2026-09-29 · 12 CVEs total
| CVE-2026-102560 | 8.6 HIGH | Libsoup: libsoup: heap buffer overflow during outgoing permessage-deflate buffer growth |
| CVE-2026-102559 | 8.6 HIGH | Libsoup: libsoup: heap buffer overflow during websocket client-frame masking |
| CVE-2026-102558 | 8.6 HIGH | Libsoup: libsoup: heap buffer overflow during websocket receive-buffer growth |
| CVE-2026-102557 | 8.6 HIGH | Libsoup: libsoup: heap buffer overflow during websocket message reassembly |
| CVE-2026-102556 | 8.6 HIGH | Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion |
| CVE-2026-95520 | 7.1 HIGH | Rpm: rpm: integer overflow in iterreadarchivenext() leads to heap-based buffer overflow wh |
| CVE-2026-97024 | 7.1 HIGH | Flatpak: flatpak: arbitrary write in root context via path traversal in deploy directory f |
| CVE-2026-102623 | 6.5 MEDIUM | Kubevirt: kubevirt: virt-controller nil-pointer dereference via malformed ephemeral volume |
| CVE-2026-97029 | 5.7 MEDIUM | Flatpak: flatpak: sandboxed app can signal unsandboxed processes in the same process group |
| CVE-2026-102473 | 5.5 MEDIUM | Dash: dash: super-polynomial backtracking in pmatch when libc fnmatch is disabled |
| CVE-2026-102474 | 4.0 MEDIUM | Dash: dash: heap out-of-bounds write in conv_escape via undersized unicode escape reservat |
IV. Related Vulnerabilities
Same product: Red Hat Enterprise Linux 10
-
CVE-2026-102560
Libsoup: libsoup: heap buffer overflow during outgoing perme -
CVE-2026-102559
Libsoup: libsoup: heap buffer overflow during websocket clie -
CVE-2026-102558
Libsoup: libsoup: heap buffer overflow during websocket rece -
CVE-2026-102557
Libsoup: libsoup: heap buffer overflow during websocket mess -
CVE-2026-102556
Libsoup: libsoup: heap buffer overflow from websocket pong s
Same vendor: Red Hat
-
CVE-2026-102560
Libsoup: libsoup: heap buffer overflow during outgoing perme -
CVE-2026-102559
Libsoup: libsoup: heap buffer overflow during websocket clie -
CVE-2026-102558
Libsoup: libsoup: heap buffer overflow during websocket rece -
CVE-2026-102623
Kubevirt: kubevirt: virt-controller nil-pointer dereference -
CVE-2026-102557
Libsoup: libsoup: heap buffer overflow during websocket mess
V. Comments for CVE-2026-102555
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