CVE-2026-102559: Red Hat Enterprise Linux 10 · Out-of-bounds Read
Affects Red Hat Enterprise Linux 10Source CVE Database V5
Not known to be exploited · CVSS 8.6 High.
Data as of 13 Nov 2026, 12:10 UTC
Thin evidence
One scorer or none| CNA (redhat) | CVSS 3.1 | 8.6 |
|---|
- 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:HExploitation evidence
Disclosed: evidence found.
CVE published 29 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10libsoup3 | Affected– | Fixed in– |
| Red Hat Enterprise Linux 10libsoup3 | Affected– | Fixed in– |
| Red Hat Enterprise Linux 10.0 Extended Update Supportlibsoup3 | Affected– | Fixed in– |
| Red Hat Enterprise Linux 7 Extended Lifecycle Supportlibsoup | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8libsoup | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportlibsoup | Affected– | 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
- access.redhat.com/errata/RHSA-2026:83384 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:83618 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:84586 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-102559 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2543285 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:92347 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:93445 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:93447 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:93466 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:93446 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:93465 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:93583 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:93716 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:98453 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:98560 (opens in a new tab)