Home/CVE/CedarJava is an open source Java implementation of the Cedar policy language, used for fine-grained authorization decisi
CVE
CVE-2026-55771
CedarJava is an open source Java implementation of the Cedar policy language, used for fine-grained authorization decisi
CedarJava is an open source Java implementation of the Cedar policy language, used for fine-grained authorization decisions. In versions prior to 4.9.0, the EntityIdentifier.equals() has inverted null/self branches which could lead to incorrect equality comparisons. The EntityIdentifier.equals() method has inverted logic for null and self-reference checks, returning true for null comparisons and false for self-comparisons.
This does not affect Cedar authorization decisions (computed in Rust from JSON), but could affect integrators who perform their own equality checks on entity identifiers. This issue has been fixed in version 4.9.0.
HIGH · CVSS 8.8
EPSS 0.00345
EPSS exploitation odds0.34% · top 73%
Schedule remediation
- CVSS base score ≥ 7.0
No Sigma yet — build one →
YARA rules0
Look this up elsewhere - one-click external pivots
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How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2026-55771, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked.
EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal.
CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score.
Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits.
PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
EPSS exploitation probability
0.34%
Top 73%odds of exploitation in the next 30 days
CVSS metric silhouette
shape grows toward worst-case
SSVC triage
No SSVC vulnrichment for this CVE. CISA's Vulnrichment program scores newer CVEs (~2024 onwards) plus selected older critical ones. Use the EPSS probability + KEV status to triage instead.
CVSS vector breakdown
Exploitability - how they get in
Attack Vector
Network
Adjacent
Local
Physical
Attack Complexity
Low
High
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Impact - what breaks
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H◆
ATT&CK techniques
4Techniques this CVE enables. Pills with a solid outline are high confidence - named directly in ATT&CK or Nuclei, or human-curated by CTID; the rest are inferred from the weakness type using MITRE's CVE Mapping Methodology and the CWE → CAPEC chain. Broad, generic-weakness guesses are filtered out. A small N× marks a technique that N independent sources agree on.
T1027.006 · HTML Smuggling T1027.009 · Embedded Payloads T1059 · Command and Scripting Interpreter T1564.009 · Resource Forking
▤ Build a SIEM detection for these techniques
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CAPEC attack patterns
12Attack patterns this CVE enables - the bridge from weakness to ATT&CK technique.
CAPEC-CAPEC-10 · Buffer Overflow via Environment Variables CAPEC-CAPEC-120 · Double Encoding CAPEC-CAPEC-14 · Client-side Injection-induced Buffer Overflow CAPEC-CAPEC-15 · Command Delimiters CAPEC-CAPEC-182 · Flash Injection CAPEC-CAPEC-24 · Filter Failure through Buffer Overflow CAPEC-CAPEC-242 · Code Injection CAPEC-CAPEC-267 · Leverage Alternate Encoding CAPEC-CAPEC-3 · Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-CAPEC-35 · Leverage Executable Code in Non-Executable Files CAPEC-CAPEC-41 · Using Meta-characters in E-mail Headers to Inject Malicious Payloads CAPEC-CAPEC-43 · Exploiting Multiple Input Interpretation Layers
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Weakness Classification
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Related CVEs
8CVEs linked to this one by a shared weakness (CWE) or affected product - joins on data already in the engine, with the reason shown per row.
CVE-2005-2801
xattr.c in the ext2 and ext3 file system code for Linux kernel 2.6 does not prop...
same CWE-697
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CVE-2011-3903
Google Chrome before 16.0.912.63 does not properly perform regex matching, which...
same CWE-697
CVE-2014-125057
A vulnerability was found in mrobit robitailletheknot. It has been classified as...
same CWE-697
LOW
CVE-2015-9238
secure-compare 3.0.0 and below do not actually compare two strings properly. com...
same CWE-697
MEDIUM
CVE-2010-0258
Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and...
same CWE-843
HIGH
CVE-2010-2299
The Clipboard::DispatchObject function in app/clipboard/clipboard.cc in Google C...
same CWE-843
CVE-2010-4577
The CSSParser::parseFontFaceSrc function in WebCore/css/CSSParser.cpp in WebKit,...
same CWE-843
HIGH
CVE-2011-0611
Adobe Flash Player before 10.2.154.27 on Windows, Mac OS X, Linux, and Solaris a...
2
same CWE-843
HIGH
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References & Sources
1Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.