CVE-2026-102558
Libsoup: libsoup: heap buffer overflow during websocket receive-buffer growth
Description
A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.
INFO
Published Date :
Sept. 29, 2026, 6:17 p.m.
Last Modified :
Oct. 19, 2026, 5:17 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-102558
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Limit the max-incoming-payload-size setting.
- Update the libsoup library.
- Monitor for frame length vulnerabilities.
- Validate incoming frame lengths.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-102558.
| URL | Resource |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:83384 | Vendor Advisory |
| https://access.redhat.com/errata/RHSA-2026:83618 | |
| https://access.redhat.com/errata/RHSA-2026:84586 | |
| https://access.redhat.com/security/cve/CVE-2026-102558 | Mitigation Vendor Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2543274 | Issue Tracking Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-102558 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-102558
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-102558 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-102558 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Oct. 19, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/102xxx/CVE-2026-102558.json">CVE-2026-102558</a> Added Reference https://access.redhat.com/errata/RHSA-2026:84586 -
CVE Modified by [email protected]
Oct. 15, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/102xxx/CVE-2026-102558.json">CVE-2026-102558</a> Added Reference https://access.redhat.com/errata/RHSA-2026:83618 -
Initial Analysis by [email protected]
Oct. 15, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:a:gnome:libsoup:*:*:*:*:*:*:*:* versions up to (excluding) 3.7.3 Added Reference Type Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:83384 Types: Vendor Advisory Added Reference Type Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-102558 Types: Mitigation, Vendor Advisory Changed Reference Type nvd-ai-agent-0.4.0-gemma-4-31B-it: https://bugzilla.redhat.com/show_bug.cgi?id=2543274 Types: Issue Tracking, Third Party Advisory nvd-ai-agent-0.4.0-gemma-4-31B-it: https://bugzilla.redhat.com/show_bug.cgi?id=2543274 Types: Issue Tracking, Issue Tracking, Third Party Advisory, Vendor Advisory Added Reference Type Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2543274 Types: Issue Tracking, Vendor Advisory -
CVE Modified by [email protected]
Oct. 15, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/102xxx/CVE-2026-102558.json">CVE-2026-102558</a> Added Reference https://access.redhat.com/errata/RHSA-2026:83384 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 30, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-102558', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-30T18:59:58.864573Z'} -
New CVE Received by [email protected]
Sep. 29, 2026
Action Type Old Value New Value Added Description A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H Added CWE CWE-125 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/102xxx/CVE-2026-102558.json">CVE-2026-102558</a> Added Reference https://access.redhat.com/security/cve/CVE-2026-102558 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2543274