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VulnerabilityPublished Updated

CVE-2026-102557: 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, 23:53 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
0.4% chance of exploitation in 30 days – higher than 40% 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 for libsoup that fix this vulnerability. Users of Red Hat Enterprise Linux 9 and related variants should apply the updates provided in advisory RHSA-2026:83384. The advisory includes instructions for applying the update. Since this is a local library used in network-facing components, patching is the recommended mitigation. No vendor advisory states that no action is required or that the issue is already mitigated without patching.

Description

A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did not adequately cap total message size against the limits of the underlying buffer type. A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.

References

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