CVE-2026-55868

Updated srt package fixes security vulnerabilities

No scoreFix available

Encryption State Machine Downgrade. (CVE-2026-55868) KMREQ/KMRSP Stack-Based Buffer Overflow. (CVE-2026-55869)

What each source reports

OSVMGASA-2026-0469 No score

Updated srt package fixes security vulnerabilities

Encryption State Machine Downgrade. (CVE-2026-55868) KMREQ/KMRSP Stack-Based Buffer Overflow. (CVE-2026-55869)

Record: MGASA-2026-0469
Updated: 2026-11-02

OSVopenSUSE-SU-2026:11357-1 No score

libsrt1_5-1.5.6-1.1 on GA media

These are all security issues fixed in the libsrt1_5-1.5.6-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2026:11357-1
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-55868 No score

[Encryption State Machine Downgrade]

Record: UBUNTU-CVE-2026-55868
Updated: 2026-11-02

OSVUSN-8764-1 No score

srt vulnerabilities

It was discovered that SRT did not authenticate certain encryption control messages. A remote attacker could possibly use this issue to downgrade an encrypted connection and inject arbitrary content or interrupt a media stream. (CVE-2026-55868)

It was discovered that SRT did not properly validate certain control packets during connection setup and key refresh operations. A remote attacker could possibly use this issue to cause SRT to crash, resulting in a denial of service. (CVE-2026-55869)

Record: USN-8764-1
Updated: 2026-11-02

Affected packages

Affected packages
Package	Affected	Fixed
`srt` Debian:12	All versions, plus listed versions 1.5.1-11.5.1-1+deb12u11.5.2-11.5.3-11.5.3-2 Show 5 moreShow less 1.5.4-11.5.4-21.5.4-31.5.5-11.5.6-1	None known
`srt` Debian:13	before 1.5.4-1+deb13u1, plus listed versions 1.5.4-1	1.5.4-1+deb13u1
`srt` Debian:14	before 1.5.6-1, plus listed versions 1.5.4-11.5.4-21.5.4-31.5.5-1	1.5.6-1
`srt` Mageia:10 From an advisory covering 2 CVEs	before 1.5.4-2.1.mga10	1.5.4-2.1.mga10
`srt` Ubuntu:Pro:20.04:LTS	before 1.4.0-1ubuntu0.1~esm1, plus listed versions 1.3.2-11.4.0-11.4.0-1build1	1.4.0-1ubuntu0.1~esm1
`srt` Ubuntu:Pro:22.04:LTS	before 1.4.4-4ubuntu0.1~esm1, plus listed versions 1.4.2-1.41.4.2-1.4ubuntu11.4.4-4	1.4.4-4ubuntu0.1~esm1
`srt` Ubuntu:Pro:24.04:LTS	before 1.5.3-1ubuntu0.1~esm1, plus listed versions 1.5.2-11.5.3-11.5.3-1build11.5.3-1build2	1.5.3-1ubuntu0.1~esm1
`srt` Ubuntu:Pro:26.04:LTS	before 1.5.4-3ubuntu0.1~esm1, plus listed versions 1.5.4-11.5.4-3	1.5.4-3ubuntu0.1~esm1
`srt` Ubuntu:Pro:20.04:LTS From an advisory covering 2 CVEs	before 1.4.0-1ubuntu0.1~esm1, plus listed versions 1.3.2-11.4.0-11.4.0-1build1	1.4.0-1ubuntu0.1~esm1
`srt` Ubuntu:Pro:22.04:LTS From an advisory covering 2 CVEs	before 1.4.4-4ubuntu0.1~esm1, plus listed versions 1.4.2-1.41.4.2-1.4ubuntu11.4.4-4	1.4.4-4ubuntu0.1~esm1
`srt` Ubuntu:Pro:24.04:LTS From an advisory covering 2 CVEs	before 1.5.3-1ubuntu0.1~esm1, plus listed versions 1.5.2-11.5.3-11.5.3-1build11.5.3-1build2	1.5.3-1ubuntu0.1~esm1
`srt` Ubuntu:Pro:26.04:LTS From an advisory covering 2 CVEs	before 1.5.4-3ubuntu0.1~esm1, plus listed versions 1.5.4-11.5.4-3	1.5.4-3ubuntu0.1~esm1
`srt` openSUSE:Tumbleweed From an advisory covering 2 CVEs	before 1.5.6-1.1	1.5.6-1.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 2, 2026	first indexed	OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-55868 is a vulnerability with no CVSS score yet in srt, published July 21, 2026. No source lists public exploit code. Fixed in srt 1.5.4-1+deb13u1.

References

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