CVE-2026-102560 Red Hat CVE debrief

Who should care

System administrators and security teams responsible for Red Hat Enterprise Linux systems that use the libsoup library should assess their exposure and take necessary actions to mitigate the vulnerability.

Why it matters

This vulnerability in libsoup could lead to a denial of service or other unspecified impacts. System administrators and security teams should assess their exposure, verify libsoup versions, and apply necessary advisories to mitigate the vulnerability.

• Denial of service due to potential buffer overflow
• Possible unspecified impacts due to lack of detailed information
• Verification of libsoup versions and advisory application priority
• Monitoring and logging implementation to detect exploitation attempts

Technical summary

The libsoup library is vulnerable to a heap buffer overflow when handling outgoing permessage-deflate buffer growth. This occurs when the permessage-deflate WebSocket extension compresses a very large outgoing message, causing truncated size calculations used for GByteArray growth to wrap. The vulnerability can lead to a denial of service or other unspecified impacts. The affected product is libsoup, and the vulnerability is triggered by a specific WebSocket extension. The CVE record and NVD entry provide details about the vulnerability.

Defensive priority

High

Recommended defensive actions

• Review and apply the available Red Hat advisories (RHSA-2026:83384 and RHSA-2026:83618) to ensure the libsoup package is updated to a non-vulnerable version.
• Verify the versions of libsoup installed on Red Hat Enterprise Linux systems to determine if they are vulnerable.
• Implement additional monitoring and logging to detect potential exploitation attempts.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record and NVD entry provide details about the vulnerability, but do not specify the exact versions affected or provide a patch. Red Hat has released advisories RHSA-2026:83384 and RHSA-2026:83618 related to this vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.