SSE stream corruption via unneutralized CRLF sequences
Published Aug 27, 2026 · Updated Aug 27, 2026
CRLF injection in Spring Framework allows remote attackers to corrupt plain-text SSE streams sent to other application users. ServerResponse.sse() in MVC functional endpoints frames attacker-controlled plain text without neutralizing CRLF sequences, permitting injected event boundaries. Exposure requires versions 5.3.0 through 5.3.49, 6.0.0 through 6.0.30, 6.1.0 through 6.1.28, 6.2.0 through 6.2.19, or 7.0.0 through 7.0.8, plus an endpoint that forwards attacker-controlled plain text rather than structured messages.
Summary
What happened
CRLF injection in Spring Framework allows remote attackers to corrupt plain-text SSE streams sent to other application users. ServerResponse.sse() in MVC functional endpoints frames attacker-controlled plain text without neutralizing CRLF sequences, permitting injected event boundaries. Exposure requires versions 5.3.0 through 5.3.49, 6.0.0 through 6.0.30, 6.1.0 through 6.1.28, 6.2.0 through 6.2.19, or 7.0.0 through 7.0.8, plus an endpoint that forwards attacker-controlled plain text rather than structured messages.
The record
- CVE
- CVE-2026-59313
- Published
- Aug 27, 2026
- Updated
- Aug 27, 2026
- Vendor
- Spring
- Product
- Spring Framework
- Classifications
- CWE-93, T1565.002
- Attack vector
- network
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 27, 2026CVE publishedPublication date reported by the CVE source.
- Aug 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.3.0 <=5.3.49
- Affected versionversion=6.0.0 <=6.0.30
- Affected versionversion=6.1.0 <=6.1.28
- Affected versionversion=6.2.0 <=6.2.19
- Affected versionversion=7.0.0 <=7.0.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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