CVE-2026-33337
published 2026-04-17CVE-2026-33337: Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the…
PriorityP348high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.54%
41.5th percentile
Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| firebirdsql | firebird | — | — |
| firebirdsql | firebird | — | — |
| firebirdsql | firebird | — | — |
| firebirdsql | firebird | >= 3.0.0 < 3.0.14 | 3.0.14 |
| firebirdsql | firebird | >= 4.0.0 < 4.0.7 | 4.0.7 |
| firebirdsql | firebird | >= 5.0.0 < 5.0.4 | 5.0.4 |
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-33337 firebird: Firebird: Denial of Service via buffer overflow in slice packet deserialization [epel-all]
bugzilla·2026-04-17·CVSS 7.5
CVE-2026-33337 [HIGH] CVE-2026-33337 firebird: Firebird: Denial of Service via buffer overflow in slice packet deserialization [epel-all]
CVE-2026-33337 firebird: Firebird: Denial of Service via buffer overflow in slice packet deserialization [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-33337 firebird: Firebird: Denial of Service via buffer overflow in slice packet deserialization [fedora-all]
bugzilla·2026-04-17·CVSS 7.5
CVE-2026-33337 [HIGH] CVE-2026-33337 firebird: Firebird: Denial of Service via buffer overflow in slice packet deserialization [fedora-all]
CVE-2026-33337 firebird: Firebird: Denial of Service via buffer overflow in slice packet deserialization [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-33337 Firebird: Firebird: Denial of Service via buffer overflow in slice packet deserialization
bugzilla·2026-04-17·CVSS 7.5
CVE-2026-33337 [HIGH] CVE-2026-33337 Firebird: Firebird: Denial of Service via buffer overflow in slice packet deserialization
CVE-2026-33337 Firebird: Firebird: Denial of Service via buffer overflow in slice packet deserialization
Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
2026-04-17
Published