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VulnerabilityPublished Updated

CVE-2026-102559: Red Hat Enterprise Linux 10 · Out-of-bounds Read

Affects Red Hat Enterprise Linux 10Source CVE Database V5

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Not known to be exploited · CVSS 8.6 High.

Data as of 13 Nov 2026, 12:10 UTC

CVSS 3.1 base score
8.6High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.18.6
EPSS
0.6% chance of exploitation in 30 days – higher than 50% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers can reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-09-30.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Enterprise Linux 10libsoup3Affected–Fixed in–
Red Hat Enterprise Linux 10libsoup3Affected–Fixed in–
Red Hat Enterprise Linux 10.0 Extended Update Supportlibsoup3Affected–Fixed in–
Red Hat Enterprise Linux 7 Extended Lifecycle SupportlibsoupAffected–Fixed in–
Red Hat Enterprise Linux 8libsoupAffected–Fixed in–
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportlibsoupAffected–Fixed in–

AI-suggested

Red Hat has released security updates addressing this issue. Users should apply the official patches provided in Red Hat Advisory RHSA-2026:83384. The advisory covers updates for Red Hat Enterprise Linux 9 and related products. Since the advisory explicitly states the availability of fixes, applying these updates is the recommended remediation.

Description

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.

References

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