CVE-2025-27911: An issue was discovered in Datalust Seq before 2024.3.13545

Q: How do I fix CVE-2025-27911?

seq: upgrade to 2024.3.13545. Exact commands for each OS are on this page.

Q: Is CVE-2025-27911 being exploited?

CVE-2025-27911 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-27911 affect?

CVE-2025-27911 affects seq. Severity is medium (CVSS 6.5). An issue was discovered in Datalust Seq before 2024.3.13545. Expansion of identifiers in message templates can be used to bypass the system "Event body limit bytes" setting, leading to increased resource consumption. With sufficiently large

Q: How urgent is CVE-2025-27911?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2025-27911 is a medium-severity flaw (CVSS 6.5) affecting seq. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Datalust Seq before 2024.3.13545. Expansion of identifiers in message templates can be used to bypass the system "Event body limit bytes" setting, leading to increased resource consumption. With sufficiently large events, there can be disk space exhaustion (if saved to disk) or a termination of the server process with an out-of-memory error.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-770
Published	2025-03-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: datalust

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-11 08:15 UTCPublished CVE record published
2026-06-17 09:04 UTCUpdated Record last modified

datalust seq UPGRADE

Affected: < 2024.3.13545

Fixed in: 2024.3.13545

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy seq || rpm -q seq || seq --version

2. UPGRADE to 2024.3.13545 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade seq

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade seq

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-27911?

seq: upgrade to 2024.3.13545. Exact commands for each OS are on this page.

Is CVE-2025-27911 being exploited?

CVE-2025-27911 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-27911 affect?

CVE-2025-27911 affects seq. Severity is medium (CVSS 6.5). An issue was discovered in Datalust Seq before 2024.3.13545. Expansion of identifiers in message templates can be used to bypass the system "Event body limit bytes" setting, leading to increased resource consumption. With sufficiently large

How urgent is CVE-2025-27911?

Priority 32/100. No elevated risk signals yet.

Related CVEs

CVE-2025-27912 HIGH 8.8 UPGRADE An issue was discovered in Datalust Seq before 2024.3.13545
CVE-2024-58102 MEDIUM 5.7 UPGRADE An issue was discovered in Datalust Seq before 2024.3.13545

References

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