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CVE-2026-102559

HIGH · CVSS 8.6 · Modified

Published: 2026-09-29 · Updated: 2026-10-29 · Source: NVD

Stored catalog record

Source record retrieved 2026-10-29T22:08:38.908547+00:00. Scheduled imports handle updates; this page does not assert that the provider was queried just now.

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Vulnerability overview

A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.

Patch review priority

Assess exposure and vendor guidance

  • No higher-priority signal is available in the current stored evidence.
  • Fresh EPSS data is unavailable; missing values are not zero.

EPSS unavailable; no zero score is assumed.

EPSS estimates probability of exploitation in the next 30 days. It does not measure your exposure or prove exploitation. The elevated threshold is 10%; CISA KEV takes precedence. About FIRST EPSS ↗

Severity and scoring

CVSS score
8.6 · HIGH
CVSS version
3.1
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weaknesses
CWE-125

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Not listed in the CISA catalog retrieved for this record. This does not establish that exploitation has not occurred.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:a:gnome:libsoup:*:*:*:*:*:*:*:*

    Before (exclusive): 3.7.3

  • 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:*:*:*:*:*:*:*

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

Explore official sources

Read the official NVD record ↗

Explore the CISA catalog ↗

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